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1996 Volume 13 Issue 2
1996, 13(2): 1-6
Abstract:
A series of new silicon-containing carbamate derivatives 3 have been prepared from reaction of 1-methylthio-ethylideneamino-methyl carbamate (Methomyl) 1 with thionyl chloride. Their structures were confirmed by 1H NMR,elemental analysis,IR and MS. The crystal structure of compound 3a was determined by X-ray diffraction method.The bioassay results showed that compound 3 have a high insecticidal activity against mosquito,armyworm, European corn borer, flour beetle and cowpea aphid and a substantial improvement in acute mammalian safety toward male and female mice when compared to that of parent Methomyl.
A series of new silicon-containing carbamate derivatives 3 have been prepared from reaction of 1-methylthio-ethylideneamino-methyl carbamate (Methomyl) 1 with thionyl chloride. Their structures were confirmed by 1H NMR,elemental analysis,IR and MS. The crystal structure of compound 3a was determined by X-ray diffraction method.The bioassay results showed that compound 3 have a high insecticidal activity against mosquito,armyworm, European corn borer, flour beetle and cowpea aphid and a substantial improvement in acute mammalian safety toward male and female mice when compared to that of parent Methomyl.
1996, 13(2): 7-10
Abstract:
Long-chain fatty acid esters of cellulose were prepared by the reaction of cellulose with acid chlorides in LiCl/DMAc solution.The effects of reaction conditions on the degree of substitution were studied.The results showed that the degree of substitution could reach 2.85 under proper reaction conditions. The drug release properties from these cellulose ester matrixes were also investigated.
Long-chain fatty acid esters of cellulose were prepared by the reaction of cellulose with acid chlorides in LiCl/DMAc solution.The effects of reaction conditions on the degree of substitution were studied.The results showed that the degree of substitution could reach 2.85 under proper reaction conditions. The drug release properties from these cellulose ester matrixes were also investigated.
1996, 13(2): 11-14
Abstract:
Nickel-tungsten films with different content of W and different structure were prepared by means of galvanostatic electrodeposition. The influence of temperature, pH value and current density on the composition of deposits was investigated. Experimental results showed that a rise in temperature is favorable to the increase of W content. X-ray diffraction was used to determine the film structure. With increase of W content. the f. c. c lattice of nickel is distorted, and the average size of grains becomes smaller. When the content of W in deposits reaches to about 56/00, the size of grains decreases to below 2 nm and the film has an amorphous structure.
Nickel-tungsten films with different content of W and different structure were prepared by means of galvanostatic electrodeposition. The influence of temperature, pH value and current density on the composition of deposits was investigated. Experimental results showed that a rise in temperature is favorable to the increase of W content. X-ray diffraction was used to determine the film structure. With increase of W content. the f. c. c lattice of nickel is distorted, and the average size of grains becomes smaller. When the content of W in deposits reaches to about 56/00, the size of grains decreases to below 2 nm and the film has an amorphous structure.
1996, 13(2): 15-17
Abstract:
The new ligand 4-acetylbiphenyl thiosemicarbazone and its complex with Cu(Ⅱ) were synthesized and characterized by elemental analysis, molar conductance, infrared and electronic spectra.The stability constant of the complex was determined using pH method. The antibacterial activities of the ligand and the complex against S. aureus, S. flexneri 2b, B. subtilis, B. proteus and A. aerogenes were examined. Experimental results showed that both have high antibacterial activities and the complex is more active than the ligand.
The new ligand 4-acetylbiphenyl thiosemicarbazone and its complex with Cu(Ⅱ) were synthesized and characterized by elemental analysis, molar conductance, infrared and electronic spectra.The stability constant of the complex was determined using pH method. The antibacterial activities of the ligand and the complex against S. aureus, S. flexneri 2b, B. subtilis, B. proteus and A. aerogenes were examined. Experimental results showed that both have high antibacterial activities and the complex is more active than the ligand.
1996, 13(2): 18-21
Abstract:
A process is described to selectively deposit thin copper films from electroless copper plating solutions on p-silicon wafers. The p-silicon was locally irradiated using a 5 W CW Ar+ laser. At the irradiated area,the copper film was formed.In this process.three kinds of thin copper films were obtained from the solutions containing different reductants. Composition and properties of the deposits were investigated using AES, SEM and RBS techniques.
A process is described to selectively deposit thin copper films from electroless copper plating solutions on p-silicon wafers. The p-silicon was locally irradiated using a 5 W CW Ar+ laser. At the irradiated area,the copper film was formed.In this process.three kinds of thin copper films were obtained from the solutions containing different reductants. Composition and properties of the deposits were investigated using AES, SEM and RBS techniques.
1996, 13(2): 22-25
Abstract:
The preparation and properties of adsorbing to Cu (Ⅱ) and Ni(Ⅱ) of chitosan modified by ethylene glycol bisglycidal ether were studied. The effects of pH, time and temperature on the adsorption were investigated. The results show that the modified chitosan is easy to be regenerated and uneasy to run off in acidic solution and it has an adsorption selectivity for Cu(Ⅱ) when Cu(Ⅱ) and Ni(Ⅱ) are present simultaneously in the solution.
The preparation and properties of adsorbing to Cu (Ⅱ) and Ni(Ⅱ) of chitosan modified by ethylene glycol bisglycidal ether were studied. The effects of pH, time and temperature on the adsorption were investigated. The results show that the modified chitosan is easy to be regenerated and uneasy to run off in acidic solution and it has an adsorption selectivity for Cu(Ⅱ) when Cu(Ⅱ) and Ni(Ⅱ) are present simultaneously in the solution.
1996, 13(2): 26-28
Abstract:
Oriented crystallization of cross linked cis-1,4-polybutadiene was investigated by WAXD and SAXS. The results showed that the samples formed "folded chain" lamellar crystallites rather than "extended chain" crystallites in the stretched state. Because new lamellar crystallites continuosly formed between old ones, the long period decreased and the lateral dimension increased gradually,thus resulting in the increase of crystallinity.
Oriented crystallization of cross linked cis-1,4-polybutadiene was investigated by WAXD and SAXS. The results showed that the samples formed "folded chain" lamellar crystallites rather than "extended chain" crystallites in the stretched state. Because new lamellar crystallites continuosly formed between old ones, the long period decreased and the lateral dimension increased gradually,thus resulting in the increase of crystallinity.
1996, 13(2): 29-32
Abstract:
Seven derivatives of 2-(4-biphenyl)benzoxazole were synthesized. Five of them are new compounds. They were identified by elemental analysis, IR, UV, MS and 1H NMR. Their fluorescence emission spectra. fluorescence quantum yields and laser conversion efficiencies were determined. The results showed that 5, 7-diisopropyl-2-(4-biphenyl)benzoxazole has high laser conversion efficiency and wide tuning range. It may be a valuable laser dye.
Seven derivatives of 2-(4-biphenyl)benzoxazole were synthesized. Five of them are new compounds. They were identified by elemental analysis, IR, UV, MS and 1H NMR. Their fluorescence emission spectra. fluorescence quantum yields and laser conversion efficiencies were determined. The results showed that 5, 7-diisopropyl-2-(4-biphenyl)benzoxazole has high laser conversion efficiency and wide tuning range. It may be a valuable laser dye.
1996, 13(2): 33-36
Abstract:
The effect of pH and electrolytes on stability of aluminium magnesium hydroxide positive sol was studied. It was found that aluminium magnesium hydroxide positive sol is stable in the range of pH 5~10; the acidic dissolution of the sol occurs at pH<5, and the surface hydroxys of sol particles lose hydrions to lose stability at pH>10.5. The higher the valence number of anions, the stronger the coagulation ability for the positive sol. Decreasing the pH, the coagulation abilities of monovalent anions (Cl-, NO3-) and CO32-, PO43- decrcase, but the coagulation ability of SO42- is almost not varied. The higher the valence number of cations, the stronger the stability for positive sol. The studies of coagulation kinetics showed that the coagulation process of monovalent anions may be divided into rapid and slow coagulation. In slow coagulation region, the stability ratio are of good linear relationship with concentration of electrolytes in agreement with classical slow coagulation theory. In addition,the static method for measuring coagulation ability has been improved.
The effect of pH and electrolytes on stability of aluminium magnesium hydroxide positive sol was studied. It was found that aluminium magnesium hydroxide positive sol is stable in the range of pH 5~10; the acidic dissolution of the sol occurs at pH<5, and the surface hydroxys of sol particles lose hydrions to lose stability at pH>10.5. The higher the valence number of anions, the stronger the coagulation ability for the positive sol. Decreasing the pH, the coagulation abilities of monovalent anions (Cl-, NO3-) and CO32-, PO43- decrcase, but the coagulation ability of SO42- is almost not varied. The higher the valence number of cations, the stronger the stability for positive sol. The studies of coagulation kinetics showed that the coagulation process of monovalent anions may be divided into rapid and slow coagulation. In slow coagulation region, the stability ratio are of good linear relationship with concentration of electrolytes in agreement with classical slow coagulation theory. In addition,the static method for measuring coagulation ability has been improved.
1996, 13(2): 37-40
Abstract:
A series of Cs+ salts of heteropolyacids(HPW12, HSiW12) were synthesized. The Hammett function H0 was determined in order to investigate the acid strength. Their acid contents were measured by acid-base titration and NH3-TPD respectively; both Bronsted and Lewis acidic sites were observed by monitoring the IR spectra of adsorbed pyridine. The specific surface areas were determined by BET-method. The acid catalytic activity of various salts was also investigated using the esterification of HAc and n-butyl alcohol as a test reaction. The results showed that the Hammett functions H0 of CsxPW series were more strong than that of Csx.SiW series, while the acidic strength and acid contents decreased with the amount of alkali metal. What is more interesting is that the samples in which their Cs contents are x=2.5 have a maximum surface area. It was confirmed that, not the acid contents on the surface but in the bulk are responsible for the catalytic activity. The reaction seems to be a pseudoliquid phase process.
A series of Cs+ salts of heteropolyacids(HPW12, HSiW12) were synthesized. The Hammett function H0 was determined in order to investigate the acid strength. Their acid contents were measured by acid-base titration and NH3-TPD respectively; both Bronsted and Lewis acidic sites were observed by monitoring the IR spectra of adsorbed pyridine. The specific surface areas were determined by BET-method. The acid catalytic activity of various salts was also investigated using the esterification of HAc and n-butyl alcohol as a test reaction. The results showed that the Hammett functions H0 of CsxPW series were more strong than that of Csx.SiW series, while the acidic strength and acid contents decreased with the amount of alkali metal. What is more interesting is that the samples in which their Cs contents are x=2.5 have a maximum surface area. It was confirmed that, not the acid contents on the surface but in the bulk are responsible for the catalytic activity. The reaction seems to be a pseudoliquid phase process.
1996, 13(2): 41-44
Abstract:
Fluorotoluene and halogenated 3-fluorotoluenes have been synthesized and oxidized by Co(OAc)2-Mn(OAc)2-NaBr system to the corresponding carboxylic acids in liquid phase with good yields. All the compounds are characterized by UV, IR, 1H NMR, MS spectrometry and elemental analysis.
Fluorotoluene and halogenated 3-fluorotoluenes have been synthesized and oxidized by Co(OAc)2-Mn(OAc)2-NaBr system to the corresponding carboxylic acids in liquid phase with good yields. All the compounds are characterized by UV, IR, 1H NMR, MS spectrometry and elemental analysis.
1996, 13(2): 45-48
Abstract:
A method of purifying Cyanex 301 by recrystallization of its ammonium salt in benzene was studied. The recovery of this method is 62.4% and purity of the product is >99%. The infrared spectrum of purified Cyanex 301 is given. The partition equilibrium of purified Cyanex 301 between n-heptane and aqueous phase and its aggregation in n-heptane were studied. The results show that purified Cyanex 301 is mainly present as a dimer in the concentration range of 0.2 to 1.0 mol/L in n-heptane.
A method of purifying Cyanex 301 by recrystallization of its ammonium salt in benzene was studied. The recovery of this method is 62.4% and purity of the product is >99%. The infrared spectrum of purified Cyanex 301 is given. The partition equilibrium of purified Cyanex 301 between n-heptane and aqueous phase and its aggregation in n-heptane were studied. The results show that purified Cyanex 301 is mainly present as a dimer in the concentration range of 0.2 to 1.0 mol/L in n-heptane.
1996, 13(2): 49-52
Abstract:
Macroporous silica gels of average pore size of 4×102~1×103 nm were prepared from silica gels of an average pore size of 20~30 nm by calcination. The obtained products have pore volumes of 0.8 mL/g and porosity of more than 0.65. Tests have shown that such macroporous silica gels can be used in GPC for the separation of polyacrylamide with MMw<1.5×107.
Macroporous silica gels of average pore size of 4×102~1×103 nm were prepared from silica gels of an average pore size of 20~30 nm by calcination. The obtained products have pore volumes of 0.8 mL/g and porosity of more than 0.65. Tests have shown that such macroporous silica gels can be used in GPC for the separation of polyacrylamide with MMw<1.5×107.
1996, 13(2): 53-56
Abstract:
Twelve complexes were synthesized by reacting β-alkoxycarbonylethyltin trichloride with 8-hydroxyquinoline or 2-salicylideneaminophenol and characterized by elemiental analysis, UV, IR, and 1H NMR spectra. The preliminary biological tests show that some compounds possess marked antihacterial activities.
Twelve complexes were synthesized by reacting β-alkoxycarbonylethyltin trichloride with 8-hydroxyquinoline or 2-salicylideneaminophenol and characterized by elemiental analysis, UV, IR, and 1H NMR spectra. The preliminary biological tests show that some compounds possess marked antihacterial activities.
1996, 13(2): 57-60
Abstract:
Transformational behaviour of Tg and Tm for PEEKK-PEBEKK copolymers with various biphenyl content was studied by using DSC. Results revealed that the glass transition temperature Tg for the copolymers gradually increased with increasing biphenyl content nB. The melting points Tm of the copolymers obviously depended on nB. Tm value was minimum when nB=0.35. Heat behaviour of the copolymers could be markedly changed by heat treatment. Behaviour of double melting peak for the copolymer resulted from the crystal melting and the recrystallization was also studied.
Transformational behaviour of Tg and Tm for PEEKK-PEBEKK copolymers with various biphenyl content was studied by using DSC. Results revealed that the glass transition temperature Tg for the copolymers gradually increased with increasing biphenyl content nB. The melting points Tm of the copolymers obviously depended on nB. Tm value was minimum when nB=0.35. Heat behaviour of the copolymers could be markedly changed by heat treatment. Behaviour of double melting peak for the copolymer resulted from the crystal melting and the recrystallization was also studied.
1996, 13(2): 61-63
Abstract:
The present paper deals with the esterification of pentaerythritol with aliphatic acids and C5-9 mixed acid. The influencing facters of esterification and properties of the pentaerythritol esters were studied. The results showed that the esterification products of octanoic acid and C5-9 mixed aicd are suitable to use as dielectric fluid with low flammability, such as transformer oil, switch oil,capacitor fluid and other dielectric fluids.The flash point is >240℃, pour point <-40℃ and breakdown voltage >35 kV/cm.
The present paper deals with the esterification of pentaerythritol with aliphatic acids and C5-9 mixed acid. The influencing facters of esterification and properties of the pentaerythritol esters were studied. The results showed that the esterification products of octanoic acid and C5-9 mixed aicd are suitable to use as dielectric fluid with low flammability, such as transformer oil, switch oil,capacitor fluid and other dielectric fluids.The flash point is >240℃, pour point <-40℃ and breakdown voltage >35 kV/cm.
1996, 13(2): 64-66
Abstract:
Using strontium acetate and titanium n-butoxide as starting reagents as well as the acetic acid and glycerol as supplementary materials, the perovskite-type SrTiO3 has been prepared by sol-gel process. IR and SEM results show that the acetic acid acts as a chelating ligand, while the glycerol plays a role in control of the drying process of gel.
Using strontium acetate and titanium n-butoxide as starting reagents as well as the acetic acid and glycerol as supplementary materials, the perovskite-type SrTiO3 has been prepared by sol-gel process. IR and SEM results show that the acetic acid acts as a chelating ligand, while the glycerol plays a role in control of the drying process of gel.
1996, 13(2): 67-69
Abstract:
A method for removal of nutrient pollutants from waste water with activated coal ash as treating agent has been described. The results show that the processing accords to Freundlish adsorbtion isotherm within the limits of experimental conditions. After being used to process polluted water, this treating agent with concentrated pollutants can be applied to plant culture, so that the nutrient contained in it will be absorbed by the plants. By using this kind of waste water treating agent, it not only removes the pollutants from the waste water, but also changes the pollutants into the nutriment that may be absorbed by plant.
A method for removal of nutrient pollutants from waste water with activated coal ash as treating agent has been described. The results show that the processing accords to Freundlish adsorbtion isotherm within the limits of experimental conditions. After being used to process polluted water, this treating agent with concentrated pollutants can be applied to plant culture, so that the nutrient contained in it will be absorbed by the plants. By using this kind of waste water treating agent, it not only removes the pollutants from the waste water, but also changes the pollutants into the nutriment that may be absorbed by plant.
1996, 13(2): 70-72
Abstract:
The asymmetric dihydroxylation of ortho-substituted 1,2-diphenylethenes affords the corresponding diols in good yields (77~89%) and high enantiomeric excesses (73~98%) in the presence of catalytic amount OsO4 and four different chiral ligands respectively.
The asymmetric dihydroxylation of ortho-substituted 1,2-diphenylethenes affords the corresponding diols in good yields (77~89%) and high enantiomeric excesses (73~98%) in the presence of catalytic amount OsO4 and four different chiral ligands respectively.
1996, 13(2): 73-75
Abstract:
High rubber content transparent MBS was synthesized via two-step emulsion graft polymerization. The effect of molecular weight regulator. rubber partcle size and rubber content on the mechanical and optical properties of MBS and PVS/MBS was investigated. MBS mixed with rubber particles of 1 μm (from bulk-suspension process) and 0.2 μm (from emilsion process) was used to modify PVC resin with satisfactory results. The morphology of PVC/MBS blends was studied by TEM.
High rubber content transparent MBS was synthesized via two-step emulsion graft polymerization. The effect of molecular weight regulator. rubber partcle size and rubber content on the mechanical and optical properties of MBS and PVS/MBS was investigated. MBS mixed with rubber particles of 1 μm (from bulk-suspension process) and 0.2 μm (from emilsion process) was used to modify PVC resin with satisfactory results. The morphology of PVC/MBS blends was studied by TEM.
1996, 13(2): 76-78
Abstract:
In developing mercury-containing inhibitors for zinc-manganese dry batteries, the authors have discovered a category of anodic type inhibitor which is quite effective in suppressing the corrosion of zinc during cell storage yet will not impede the dissolution of zinc during cell discharge. By d. c. polarization measurement and a. c. impedance analysis, the working mechanism of the inhibitors was revealed to be closely related to the adsorption of the inhibitor molecules on zinc surface at open-circuit potential. But once the cell is to discharge in a closed circuit, the molecules are rendered to desorb from the surface by the positive shift of the zinc electrode potential.
In developing mercury-containing inhibitors for zinc-manganese dry batteries, the authors have discovered a category of anodic type inhibitor which is quite effective in suppressing the corrosion of zinc during cell storage yet will not impede the dissolution of zinc during cell discharge. By d. c. polarization measurement and a. c. impedance analysis, the working mechanism of the inhibitors was revealed to be closely related to the adsorption of the inhibitor molecules on zinc surface at open-circuit potential. But once the cell is to discharge in a closed circuit, the molecules are rendered to desorb from the surface by the positive shift of the zinc electrode potential.
1996, 13(2): 79-81
Abstract:
A series of thermotropic liquid crystalline copolyesters was synthesized by melt polycondensation from bis (4-hydroxyphenyl) methanone,terephthalic acid, p-hydroxybenzoic acid and aliphatic diols. The resulting copolyesters were characterized by WAXD, DSC and PLM.All the copolyesters formed a nematic phase.
A series of thermotropic liquid crystalline copolyesters was synthesized by melt polycondensation from bis (4-hydroxyphenyl) methanone,terephthalic acid, p-hydroxybenzoic acid and aliphatic diols. The resulting copolyesters were characterized by WAXD, DSC and PLM.All the copolyesters formed a nematic phase.
1996, 13(2): 82-84
Abstract:
In the present paper sulfonated poly (phenylene oxide)lithium (SPPOLi) was blended with ester plasticizers propylene carbonate, dioctyl phosphite, and butyl stearate, respectively.It was found that the dielectiric constants of plasticizers had a significant influence on the conductivity of blends: the plasticizer with high dielectric constant could increase the conductivity of SPPOLi effectively. It was also found that the dependence of the conductivity of blends on temperature was not consistent with the Arrhenius equation. The ionic migration numbers indicated that the blends were single-ion conductivity materials. X-ray diffraction was used to investigate the condensed state structure of the blends.
In the present paper sulfonated poly (phenylene oxide)lithium (SPPOLi) was blended with ester plasticizers propylene carbonate, dioctyl phosphite, and butyl stearate, respectively.It was found that the dielectiric constants of plasticizers had a significant influence on the conductivity of blends: the plasticizer with high dielectric constant could increase the conductivity of SPPOLi effectively. It was also found that the dependence of the conductivity of blends on temperature was not consistent with the Arrhenius equation. The ionic migration numbers indicated that the blends were single-ion conductivity materials. X-ray diffraction was used to investigate the condensed state structure of the blends.
1996, 13(2): 85-87
Abstract:
High-strength polyethylene fiber (Dyneema SK60) was surface modified through cold air plasma treatment. Poly(acrylic acid)(PAA)and poly(acrylic acid-co-ethyl acrylate) (P (AA/EA)) were grafted onto plasma activated Dyneema SK60 fibers. Fiber interfacial properties were studied with a single fiber pull-out test. The stated surface modifications evidently improved the interfacial adhesion and increased the interfacial fracture energy of the Dyneema/epoxy composite system.
High-strength polyethylene fiber (Dyneema SK60) was surface modified through cold air plasma treatment. Poly(acrylic acid)(PAA)and poly(acrylic acid-co-ethyl acrylate) (P (AA/EA)) were grafted onto plasma activated Dyneema SK60 fibers. Fiber interfacial properties were studied with a single fiber pull-out test. The stated surface modifications evidently improved the interfacial adhesion and increased the interfacial fracture energy of the Dyneema/epoxy composite system.
1996, 13(2): 88-90
Abstract:
We have investigated the catalytic properties of scheelite-type oxide Bi1-x/3V1-x-MoxO4 in the selective oxidation of propane to acrolein.When x is 0.45, the catalyst Bi0.85V0.55Mo0.45O4 shows good catalytic effect; the selectivity for acrolein is 23% at 54% conversion of propane. Monovalent silver promoter markedly improves catalytic performance of the bismuth vanadomolybdate Bi0.85V0.55Mo0.45O4. Under the optimum reaction condition. the catalyst Ag0.01Bi0.85V0.54Mo0.45O4 shows much better catalytic performance with the selectivity for acrolein being 32% at 52% conversion of propane.
We have investigated the catalytic properties of scheelite-type oxide Bi1-x/3V1-x-MoxO4 in the selective oxidation of propane to acrolein.When x is 0.45, the catalyst Bi0.85V0.55Mo0.45O4 shows good catalytic effect; the selectivity for acrolein is 23% at 54% conversion of propane. Monovalent silver promoter markedly improves catalytic performance of the bismuth vanadomolybdate Bi0.85V0.55Mo0.45O4. Under the optimum reaction condition. the catalyst Ag0.01Bi0.85V0.54Mo0.45O4 shows much better catalytic performance with the selectivity for acrolein being 32% at 52% conversion of propane.
1996, 13(2): 91-94
Abstract:
As spectral sensitizers, the indolyl-10H-pyrido[1,2-a]indolium perchlorates Ia~k were synthesized. The UV and FL spectra of Ia~k bave been studied. In UV spectra, good correlation between λmax1 and substituent constants Δσ+ (σp+-σm+) was obtained. In FL spectra, the intramolecular energy transfer was observed. The spectral sensitization for polyvinylcarbazole (PVCz) of Ia~k has been tested. It was found that the sensitivity of PVCz/TNF was increased witb addition of I (R=NMe2).
As spectral sensitizers, the indolyl-10H-pyrido[1,2-a]indolium perchlorates Ia~k were synthesized. The UV and FL spectra of Ia~k bave been studied. In UV spectra, good correlation between λmax1 and substituent constants Δσ+ (σp+-σm+) was obtained. In FL spectra, the intramolecular energy transfer was observed. The spectral sensitization for polyvinylcarbazole (PVCz) of Ia~k has been tested. It was found that the sensitivity of PVCz/TNF was increased witb addition of I (R=NMe2).
1996, 13(2): 95-97
Abstract:
By using microcalorimetric method, the thermogenesis power curves of aerobacter aerogenes growth at different temperature and under the action of different drugs were determined. From the thermogenesis power curves. the growth rate constants k of aerobacter aerogenes were calculated as: lnPt=lnP0+k·t. From the equation k=A(T-α)en(T-α),the optimum growth temperature Tm=(310.21±0.94) K was obtained. Tm is a very significant constant of bacterial growth.
By using microcalorimetric method, the thermogenesis power curves of aerobacter aerogenes growth at different temperature and under the action of different drugs were determined. From the thermogenesis power curves. the growth rate constants k of aerobacter aerogenes were calculated as: lnPt=lnP0+k·t. From the equation k=A(T-α)en(T-α),the optimum growth temperature Tm=(310.21±0.94) K was obtained. Tm is a very significant constant of bacterial growth.
1996, 13(2): 98-100
Abstract:
Oligoesters were prepared by the reaction of adipic acid with dibasic alcohols, such as glycol, propanedio1-1,2, diglycol and triglycol. The oligoesters reacted with hexamethylene-diisocyanate and glycol acrylate to give photocurable oligoester acrylourethane resins. The resins were characterized by elemental analysis, IR and 1H NMR spectra. These resins are in the solid state or semi-solid state with specific gravity d4201.18, bulk viscosity (at 38℃) 28500 MPa· s, pH=5.5, content of hydroxyl group 0.3%, photocuring speed<0.3 s, excellent gloss and levelling. They are used as a main component of printing ink.
Oligoesters were prepared by the reaction of adipic acid with dibasic alcohols, such as glycol, propanedio1-1,2, diglycol and triglycol. The oligoesters reacted with hexamethylene-diisocyanate and glycol acrylate to give photocurable oligoester acrylourethane resins. The resins were characterized by elemental analysis, IR and 1H NMR spectra. These resins are in the solid state or semi-solid state with specific gravity d4201.18, bulk viscosity (at 38℃) 28500 MPa· s, pH=5.5, content of hydroxyl group 0.3%, photocuring speed<0.3 s, excellent gloss and levelling. They are used as a main component of printing ink.
1996, 13(2): 101-103
Abstract:
Two new solid coordination compounds of uranyl with bis-Schiff base o-vanillin-o-phenylenediamine (H2L1) or salicylidene o-phenylenediamine (H2L2) have been prepared and characterized by elemental analysis, DTA-TG,IR, UV, molar conductance and X-ray diffraction analyses. The compositions of the coordination compounds UO2L1H2O and UO2L2C2H5OH were confirmed and their possible structures were conjectured.
Two new solid coordination compounds of uranyl with bis-Schiff base o-vanillin-o-phenylenediamine (H2L1) or salicylidene o-phenylenediamine (H2L2) have been prepared and characterized by elemental analysis, DTA-TG,IR, UV, molar conductance and X-ray diffraction analyses. The compositions of the coordination compounds UO2L1H2O and UO2L2C2H5OH were confirmed and their possible structures were conjectured.
1996, 13(2): 104-106
Abstract:
Antitumor activity of fifty molybdenum heteropoly compounds with different structure was studied systematically by the MTT method for the first time. The influences of heteropolyanion structure, substituent atoms and ions on antitumor acitivty were discussed. It was found that the reduction products heteropoly blue display far better antitumor activity than their parent molybdenum heteropoly compounds with Keggin structure.
Antitumor activity of fifty molybdenum heteropoly compounds with different structure was studied systematically by the MTT method for the first time. The influences of heteropolyanion structure, substituent atoms and ions on antitumor acitivty were discussed. It was found that the reduction products heteropoly blue display far better antitumor activity than their parent molybdenum heteropoly compounds with Keggin structure.
1996, 13(2): 107-108
Abstract:
The synthesis of 4-(4'-propylcyclohexyl)benzyl alkyl ethers which are useful in TN liquid crystals as diluting agents was studied.
The synthesis of 4-(4'-propylcyclohexyl)benzyl alkyl ethers which are useful in TN liquid crystals as diluting agents was studied.
1996, 13(2): 109-110
Abstract:
The redox behavior of Ag-doped bismuth vanadomolybdate catalysts and promotion of catalysis by Ag+ have been investigated by XPS in situ Ar+ ion etching. The results of XPS show that Mo6+ cation is the site on which hydrocarbons absorb and Bi3+ cation is responsible for converting molecular oxygen into lattice oxide ion. In the reaction process. Mo6+ cation is reduced by hydrocarbons and Bi3+ cation is oxidized by molecular oxygen. The V5+ cation is involved in diffusing O2- and transferring electrons into the bulk of catalysts. Ag+-promoter is conducive to forming lattice oxide ions frorn molecular oxygen and increasing the reoxidation speed on the position of Bi3- cation.
The redox behavior of Ag-doped bismuth vanadomolybdate catalysts and promotion of catalysis by Ag+ have been investigated by XPS in situ Ar+ ion etching. The results of XPS show that Mo6+ cation is the site on which hydrocarbons absorb and Bi3+ cation is responsible for converting molecular oxygen into lattice oxide ion. In the reaction process. Mo6+ cation is reduced by hydrocarbons and Bi3+ cation is oxidized by molecular oxygen. The V5+ cation is involved in diffusing O2- and transferring electrons into the bulk of catalysts. Ag+-promoter is conducive to forming lattice oxide ions frorn molecular oxygen and increasing the reoxidation speed on the position of Bi3- cation.
1996, 13(2): 111-112
Abstract:
(2-Azido-1, 1-dinitroethyl)benzene has been synthesized and its structure determined.Thermal decomposition of the title compound has been studied by DTA, and some of other properties are also reported.
(2-Azido-1, 1-dinitroethyl)benzene has been synthesized and its structure determined.Thermal decomposition of the title compound has been studied by DTA, and some of other properties are also reported.
1996, 13(2): 113-114
Abstract:
In the present paper the reaction process of alkali roasting of simulated samples and kaolinite minerals was studied.TG, DTA and XRD were used to follow the phase transitions and the resultant product species during the alkali roasting. Reactivities of the conversion products were tested and verified through synthesis of molecular sieves, hence clarifying the inter-relationship between active ingredients and alkali roasting conditions.
In the present paper the reaction process of alkali roasting of simulated samples and kaolinite minerals was studied.TG, DTA and XRD were used to follow the phase transitions and the resultant product species during the alkali roasting. Reactivities of the conversion products were tested and verified through synthesis of molecular sieves, hence clarifying the inter-relationship between active ingredients and alkali roasting conditions.
1996, 13(2): 115-116
Abstract:
This paper discussed the relation between the electronic properties of doped In2O3 and the Lewis acid strength of doping elements. The authors pointed out the key to the choice of appropriate doping elements for improving electric properties of doped In2O3. The carrier concentration and mobility of doped In2O3 increased when Ti4+,Ge4+ and Sn4+ were used as doping elements.
This paper discussed the relation between the electronic properties of doped In2O3 and the Lewis acid strength of doping elements. The authors pointed out the key to the choice of appropriate doping elements for improving electric properties of doped In2O3. The carrier concentration and mobility of doped In2O3 increased when Ti4+,Ge4+ and Sn4+ were used as doping elements.
1996, 13(2): 117-118
Abstract:
The crosslinking of water soluble terpolymers P(AM-AA-HPA)in acidic aqueous solution with formaldehyde was studied.It was demonstrated that the crosslinking reactions occurred at the sites of amido bond of acrylamide (AM) and the OH group of β-hydroxypropylacrylate(HPA).The crosslinked film exhibits excellent hydrophilic as well as oil-repelling properties and with incorporation of ZnO can be used as a coating to prepare the printing plate on polyethylene glycol terephthalate substrate.
The crosslinking of water soluble terpolymers P(AM-AA-HPA)in acidic aqueous solution with formaldehyde was studied.It was demonstrated that the crosslinking reactions occurred at the sites of amido bond of acrylamide (AM) and the OH group of β-hydroxypropylacrylate(HPA).The crosslinked film exhibits excellent hydrophilic as well as oil-repelling properties and with incorporation of ZnO can be used as a coating to prepare the printing plate on polyethylene glycol terephthalate substrate.
