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1989 Volume 6 Issue 3
1989, 6(3): 1-5
Abstract:
Poly-γ-(p-diphenyl phosphinophenyl)propyl siloxane platinum and rhodium complexes have been synthesized from γ-(p-chlorophenyl)-propyltrimethoxysilane via phosphatization with potassium diphenylphosphide,immobilization and hydrolysis on fumed silica,followed by reaction with potassium chloroplatinite or rhodium chloride. They exhibited high catalytic activity for the hydrosilylation of decene,dodecene, ω-chloroundecene, allyl benzene, phenyl allyl ethe, and allyl glycidyl ether with triethoxysilane from 80 to 100℃ and could be reused several times without loss of activity.
Poly-γ-(p-diphenyl phosphinophenyl)propyl siloxane platinum and rhodium complexes have been synthesized from γ-(p-chlorophenyl)-propyltrimethoxysilane via phosphatization with potassium diphenylphosphide,immobilization and hydrolysis on fumed silica,followed by reaction with potassium chloroplatinite or rhodium chloride. They exhibited high catalytic activity for the hydrosilylation of decene,dodecene, ω-chloroundecene, allyl benzene, phenyl allyl ethe, and allyl glycidyl ether with triethoxysilane from 80 to 100℃ and could be reused several times without loss of activity.
1989, 6(3): 6-9
Abstract:
The dynamic mechanical properties of the copolymer networks,AB-crosslinked polymers (ABCP), from a castor oil polyurethane(COPU)and poly(butyl methactylate) (PBMA) were quite different from that of IPN which have the similar composition to ABCP.In the case of COPU/PBMA ABCP,the damping peaks of the two components shift inward and overlap each other,which reveals that the polymer system is partially compatible.However, the damping peak of COPU/PBMA 1PN is a wide plateau.The electron micrographs show the larger domain sizes in IPN than in ABCP.The iesults indicates that the effect of chemical crosslinking on the compatibility is more notable than the physical entanglement. ABCP's from COPU/PST and COPU/PMMA are partially compatible like that of COPU/PBMA,while COPU/PMA and COPU/PBA aro completely compatible.
The dynamic mechanical properties of the copolymer networks,AB-crosslinked polymers (ABCP), from a castor oil polyurethane(COPU)and poly(butyl methactylate) (PBMA) were quite different from that of IPN which have the similar composition to ABCP.In the case of COPU/PBMA ABCP,the damping peaks of the two components shift inward and overlap each other,which reveals that the polymer system is partially compatible.However, the damping peak of COPU/PBMA 1PN is a wide plateau.The electron micrographs show the larger domain sizes in IPN than in ABCP.The iesults indicates that the effect of chemical crosslinking on the compatibility is more notable than the physical entanglement. ABCP's from COPU/PST and COPU/PMMA are partially compatible like that of COPU/PBMA,while COPU/PMA and COPU/PBA aro completely compatible.
1989, 6(3): 10-14
Abstract:
Eighteen new complexes PtA2X A=NH3,CH3NH2, 1/2 en(ethylenediamine) and 1/2 dmbn 2, 3-dimethy1-2, 3-butanediamine); X=CPrDCA (cyclopropane-1, 1-dicarboxylic acid), 2-M-CPrDCA (2-methyl-cyclopropane-1, 1-dicarboxylic acid), 2-M -CBDCA (2-methyl-cyclobutane-1,1 -dicarboxylic acid),CPDCA (cyclopentane-1, 1-dicarboxylic acid) and CHDCA(cyclohexane-11-dicarboxylic acid))have been synthesized and characterized. It is found that the activities of complexes[Pt(NH3)2X] against W-256 in rats are in following order:CPrDCA >2-M-CPrDCA >CPDCA >CBDCA(carboplatin) ≥2-M-CBDCA.
Eighteen new complexes PtA2X A=NH3,CH3NH2, 1/2 en(ethylenediamine) and 1/2 dmbn 2, 3-dimethy1-2, 3-butanediamine); X=CPrDCA (cyclopropane-1, 1-dicarboxylic acid), 2-M-CPrDCA (2-methyl-cyclopropane-1, 1-dicarboxylic acid), 2-M -CBDCA (2-methyl-cyclobutane-1,1 -dicarboxylic acid),CPDCA (cyclopentane-1, 1-dicarboxylic acid) and CHDCA(cyclohexane-11-dicarboxylic acid))have been synthesized and characterized. It is found that the activities of complexes[Pt(NH3)2X] against W-256 in rats are in following order:CPrDCA >2-M-CPrDCA >CPDCA >CBDCA(carboplatin) ≥2-M-CBDCA.
1989, 6(3): 15-20
Abstract:
A series of acyl derivatives of 2,2-bis-ferrocenylalkanes have been prepared from 2,2-bis-lerrocenylakanes (i.e. bisferrocenyl methane, 2, 2-bisferrocenylpropane, 2, 2-bis-ferrocenylbutane and 2, 2-bisferrocenylpentane) and acid anhydrides (i.e.acetic-propionic-,n-butyric anhydride) by Friedel-Crafts acylation. The ketones were reduced to the corresponding α-hydroxyalkyl derivatives of 2, 2-bisferrocenylalkanes with LiAlH4·Eighteen α-hydroxyalkyl and di-(α-hydroxyalkyl)derivatives have been synthesized. The synthesis and characteristies of IR and 1HNMR spectra of the compounds have been discussed.
A series of acyl derivatives of 2,2-bis-ferrocenylalkanes have been prepared from 2,2-bis-lerrocenylakanes (i.e. bisferrocenyl methane, 2, 2-bisferrocenylpropane, 2, 2-bis-ferrocenylbutane and 2, 2-bisferrocenylpentane) and acid anhydrides (i.e.acetic-propionic-,n-butyric anhydride) by Friedel-Crafts acylation. The ketones were reduced to the corresponding α-hydroxyalkyl derivatives of 2, 2-bisferrocenylalkanes with LiAlH4·Eighteen α-hydroxyalkyl and di-(α-hydroxyalkyl)derivatives have been synthesized. The synthesis and characteristies of IR and 1HNMR spectra of the compounds have been discussed.
1989, 6(3): 21-25
Abstract:
Lanthanide-induced shifts have been measured for 13C nuclei of methionine in the presence of seven lanthanide cations (La, P_1, Nd, Dy, Ho,Er, Tm) in aqueous solution.The simulation for conformation of lanthanide complexes with methionine shows that the ligand is coordinated to lanthanide ion through oxygen atoms of carboxyl group and the bend length of Ln-O is 2.7Å. In the complexes,methionine is in extended state,the favorable conformation of Cο-Cα-Cβ-Cγ-S and Cα-Cβ-Cγ-S is in trans, while that of Cβ-Cγ-S-Cδ in gauche. The conformation established for methionine complex by lanthanide-induced shift method is in agreement with the results of vicinyl proton coupling constants and 13C paramagnetic relaxation rate determinations.
Lanthanide-induced shifts have been measured for 13C nuclei of methionine in the presence of seven lanthanide cations (La, P_1, Nd, Dy, Ho,Er, Tm) in aqueous solution.The simulation for conformation of lanthanide complexes with methionine shows that the ligand is coordinated to lanthanide ion through oxygen atoms of carboxyl group and the bend length of Ln-O is 2.7Å. In the complexes,methionine is in extended state,the favorable conformation of Cο-Cα-Cβ-Cγ-S and Cα-Cβ-Cγ-S is in trans, while that of Cβ-Cγ-S-Cδ in gauche. The conformation established for methionine complex by lanthanide-induced shift method is in agreement with the results of vicinyl proton coupling constants and 13C paramagnetic relaxation rate determinations.
1989, 6(3): 26-30
Abstract:
The raw material NH4HCO3 and NaCl in the production of sodium carbonate accordingto the double decomposition NH4HCO3+NaCl→NaHCO3+NH4Cl (2) are plentiful in China. The main difficulty of the process technologically is the separating NH4Cl from the mother solotion I. In this paper the method of adding a middle salt,NH4NO3 or (NH4)2SO4, has been studied. The middle salts can not change the place of the saturated pointes of the reciprocal system in the dry-salt diagram evidently,but can prolong the waiting time for crystallization of NaHCO3 in the mother solution Ⅱ. The effect of NH4NO3 is much better than that of (NH4)2SO4. In adding NH4NO3, the waiting time is prolonged enough to separate tbe crystalline of NH4Cl and the process of the fomula (2) become practicable.
The raw material NH4HCO3 and NaCl in the production of sodium carbonate accordingto the double decomposition NH4HCO3+NaCl→NaHCO3+NH4Cl (2) are plentiful in China. The main difficulty of the process technologically is the separating NH4Cl from the mother solotion I. In this paper the method of adding a middle salt,NH4NO3 or (NH4)2SO4, has been studied. The middle salts can not change the place of the saturated pointes of the reciprocal system in the dry-salt diagram evidently,but can prolong the waiting time for crystallization of NaHCO3 in the mother solution Ⅱ. The effect of NH4NO3 is much better than that of (NH4)2SO4. In adding NH4NO3, the waiting time is prolonged enough to separate tbe crystalline of NH4Cl and the process of the fomula (2) become practicable.
STRUCTURE OF BLENDS OF EPOXY RESIN/POLY (ETHYLENE OXIDE) AND THEIR COMPLEXES WITH SODIUM THIOCYANATE
1989, 6(3): 31-36
Abstract:
The crosslinked blends of epoxy resin(ER) and poly(ethylene oxide) (PEO) in various component ratio with different molecular weight were investigated by WAXD, SAXS, DSC and SEM methods. It is found that the crystalline blends of ER/PEO were gradually changed into amorphous and the coherent lengthes were also reduced when ER content was increased The crystal of ER/PEO blend belongs to monoclinic, that of ER/PEO-NaSCN triclinic.The crystallinity of ER/PEO-NaSCN reduces,but its long period increases in comparison with uncomplexed ER/PEO. Increasing ER content results in the increase of noncrystalline zone and long period, as well as the reduction of crystalline lamella.
The crosslinked blends of epoxy resin(ER) and poly(ethylene oxide) (PEO) in various component ratio with different molecular weight were investigated by WAXD, SAXS, DSC and SEM methods. It is found that the crystalline blends of ER/PEO were gradually changed into amorphous and the coherent lengthes were also reduced when ER content was increased The crystal of ER/PEO blend belongs to monoclinic, that of ER/PEO-NaSCN triclinic.The crystallinity of ER/PEO-NaSCN reduces,but its long period increases in comparison with uncomplexed ER/PEO. Increasing ER content results in the increase of noncrystalline zone and long period, as well as the reduction of crystalline lamella.
1989, 6(3): 37-41
Abstract:
In this paper the syntheses of cyclopentanyl (ora llyl) cyclopentadienyl lanthanoid dichloride tetrahydrofuranate complexes are first reported. The complexes of C5H9C5H4·LnCl2-nTHF and C3H5C5H4LnCl2·nTHF (C3H9C5H4=cyclopentanyl cyclopentadienyl; C3H5C5H4=allylcyclopentadienyl; Ln=Nd, Sm, Gd; n=0, 1, 2, 3) are identified by elemental analysis, thermal analysis, IR, MS and NMR measurements. The crysal structure of the reaction intermediate C5H9C5H4Na·THF was determined by the x-ray diffraction method.
In this paper the syntheses of cyclopentanyl (ora llyl) cyclopentadienyl lanthanoid dichloride tetrahydrofuranate complexes are first reported. The complexes of C5H9C5H4·LnCl2-nTHF and C3H5C5H4LnCl2·nTHF (C3H9C5H4=cyclopentanyl cyclopentadienyl; C3H5C5H4=allylcyclopentadienyl; Ln=Nd, Sm, Gd; n=0, 1, 2, 3) are identified by elemental analysis, thermal analysis, IR, MS and NMR measurements. The crysal structure of the reaction intermediate C5H9C5H4Na·THF was determined by the x-ray diffraction method.
1989, 6(3): 42-45
Abstract:
In this paper seven o-alkoxy phenols and their corresponding isotope lithium compounds of 7Li and 6Li have been Frepared through the selective monoalkylating reaction of pyrocatechol and alkylhalides by phase transter catalyst. Li-O absorption frequencies in the IR spectra were found in the range of 500±100cm-1, which obeyed the tetrahedron rule of inorganic lithium compounds. The isotope effect by 6Li and 7Li was also observed.The strong double peak in the range of 1400-1350cm-1 presented in the IR spectra of o-alkoxy phenol parent compounds disappeared in the spectra of their correspounding lithium compounds demonstrating the deformation vibration of OH in the alcohols and phenols. The lithium compounds gave two kinds of aggregate ion peaks in mass spectra namely[LinRn]+ and [LinRn-1]+.
In this paper seven o-alkoxy phenols and their corresponding isotope lithium compounds of 7Li and 6Li have been Frepared through the selective monoalkylating reaction of pyrocatechol and alkylhalides by phase transter catalyst. Li-O absorption frequencies in the IR spectra were found in the range of 500±100cm-1, which obeyed the tetrahedron rule of inorganic lithium compounds. The isotope effect by 6Li and 7Li was also observed.The strong double peak in the range of 1400-1350cm-1 presented in the IR spectra of o-alkoxy phenol parent compounds disappeared in the spectra of their correspounding lithium compounds demonstrating the deformation vibration of OH in the alcohols and phenols. The lithium compounds gave two kinds of aggregate ion peaks in mass spectra namely[LinRn]+ and [LinRn-1]+.
1989, 6(3): 46-47
Abstract:
Altogether 45 samples were taken from different parts of three large gypsum crystals collected in China. The mass spectrometric analysis indicated an overall isotopic fractionation factor for 34S, α=1.003±0.001.
Altogether 45 samples were taken from different parts of three large gypsum crystals collected in China. The mass spectrometric analysis indicated an overall isotopic fractionation factor for 34S, α=1.003±0.001.
1989, 6(3): 48-50
Abstract:
The discharge properties of the cell consisted of Li/1mol/dm3 LiClO4+THF/PA/carbon fibre composite film have been investigated by galvanostatic method.When it was discharged at a small constant current the cell showed energy density and capacity up to 726Wh/kg and 624Ah/kg respectively. Increasing PA content in the composite can increase the capacity of the cell, but deteriorate other properties. The rate of self-discharge in a year was below 6%.
The discharge properties of the cell consisted of Li/1mol/dm3 LiClO4+THF/PA/carbon fibre composite film have been investigated by galvanostatic method.When it was discharged at a small constant current the cell showed energy density and capacity up to 726Wh/kg and 624Ah/kg respectively. Increasing PA content in the composite can increase the capacity of the cell, but deteriorate other properties. The rate of self-discharge in a year was below 6%.
1989, 6(3): 51-53
Abstract:
The ferrite-type catalyst was found to have good activitty. The X-ray diffraction and Mossbauer spectroscopy measurements show that the active structure of the catalyst is non-stoichiometric magnetite:FeA3+[Fe1-3δ2+)Fe1+2δ3+□δ]BO4 The structure formed after substituting Cr3+ for Fe3+ seems to be an iron-chromium spinellike mixed oxide:FeA3+[Fe1-x3+Fe2+Crx3+]BO4
The ferrite-type catalyst was found to have good activitty. The X-ray diffraction and Mossbauer spectroscopy measurements show that the active structure of the catalyst is non-stoichiometric magnetite:FeA3+[Fe1-3δ2+)Fe1+2δ3+□δ]BO4 The structure formed after substituting Cr3+ for Fe3+ seems to be an iron-chromium spinellike mixed oxide:FeA3+[Fe1-x3+Fe2+Crx3+]BO4
1989, 6(3): 54-56
Abstract:
A Nd:YAG pulsed laser was used to excite photosensitizers to induce the generation of singlet molecular oxygen in sclution. The lifetimes of O2 (1△g) in various solvents were determined by monitoring the phosphorescence at 1270 nm. Experimental results reveal that the phosphorescence lifetime of singlet oxygen in solution depends mainly on the property of solvents used.
A Nd:YAG pulsed laser was used to excite photosensitizers to induce the generation of singlet molecular oxygen in sclution. The lifetimes of O2 (1△g) in various solvents were determined by monitoring the phosphorescence at 1270 nm. Experimental results reveal that the phosphorescence lifetime of singlet oxygen in solution depends mainly on the property of solvents used.
1989, 6(3): 57-58
Abstract:
Reaction of vinylalanate obtained from the readily available. dialkylvinylalane and n-butyl lithium with α-halo-amides produced the corresponding 6, γ-unsaturated amides, withclean retention of the configuration. The yields were 35% to 70%.
Reaction of vinylalanate obtained from the readily available. dialkylvinylalane and n-butyl lithium with α-halo-amides produced the corresponding 6, γ-unsaturated amides, withclean retention of the configuration. The yields were 35% to 70%.
1989, 6(3): 59-61
Abstract:
The reduction of the title complex on a micro golden grid electrode using thin layer cyclic voltammetry and spectrcelectrochemistry techniques was studied. The results showed that the transfer number of the first step reduction of Co(Ⅱ) was 1, and E0=-0.583V(vs SCE). A mechanisum was Proposed.
The reduction of the title complex on a micro golden grid electrode using thin layer cyclic voltammetry and spectrcelectrochemistry techniques was studied. The results showed that the transfer number of the first step reduction of Co(Ⅱ) was 1, and E0=-0.583V(vs SCE). A mechanisum was Proposed.
1989, 6(3): 62-64
Abstract:
The crystals of the title compound (C16H20O5NSb) are monoclinic with space group P21/n and a=19.055(4)Å, b=8.867(2)Å, c=20.329(5)A; β=102.64(7)° for Z=8. The intensity data are collected on the fourcicle diffratometer of model CAD4-11/44. The structure was refined to R=0.034 for 5603 reflections.
The crystals of the title compound (C16H20O5NSb) are monoclinic with space group P21/n and a=19.055(4)Å, b=8.867(2)Å, c=20.329(5)A; β=102.64(7)° for Z=8. The intensity data are collected on the fourcicle diffratometer of model CAD4-11/44. The structure was refined to R=0.034 for 5603 reflections.
1989, 6(3): 65-67
Abstract:
The thermal stabilities of chlorinated polyvinylchloride(CPVC) and polyvinyl chloride (PVC) were compared through their infrared spectra and conductivity data. CPVC showed a much higher thermalstability than PVC. The influence of chlorine content in polymers on the stability. has been discussed.
The thermal stabilities of chlorinated polyvinylchloride(CPVC) and polyvinyl chloride (PVC) were compared through their infrared spectra and conductivity data. CPVC showed a much higher thermalstability than PVC. The influence of chlorine content in polymers on the stability. has been discussed.
1989, 6(3): 68-70
Abstract:
The crystal structure of the title compound in which DME=Dimethoxyethane was determined using x-ray diffractometer. The complex crystallizes in monoclinic space group P21/a with Z=4. Lattice parameters are: a=13.547(8), b=8.607(4), c=16.029(9)Å,β=90.35(5)°. The crystal structure was determined by Patterson and Fourier techniques and refined by least-squares to a final value R=0.0443. The samarium(Ⅲ) ion is 7-coordinate,being bonded to three chlorine atoms, two oxygen atoms of two THF and two oxygen atems of DME. The Sm-Cl distances are in the range 2.647-2.674Å. The Sm-O distances are in the range 2.465-2.504Å.
The crystal structure of the title compound in which DME=Dimethoxyethane was determined using x-ray diffractometer. The complex crystallizes in monoclinic space group P21/a with Z=4. Lattice parameters are: a=13.547(8), b=8.607(4), c=16.029(9)Å,β=90.35(5)°. The crystal structure was determined by Patterson and Fourier techniques and refined by least-squares to a final value R=0.0443. The samarium(Ⅲ) ion is 7-coordinate,being bonded to three chlorine atoms, two oxygen atoms of two THF and two oxygen atems of DME. The Sm-Cl distances are in the range 2.647-2.674Å. The Sm-O distances are in the range 2.465-2.504Å.
1989, 6(3): 71-74
Abstract:
The behaviour of water in H2O-CHCl3-CCl4 system is studied.by 1H NMR method.Water is thought to exist in the form of H2O, H2O·CHCl3, (H2O)2 and (H2O)2·CHCl3 in the system.The formation constants for the species of H2O·CHCl3, (H2O)2 and (H2O)2·CHCl3 evaluated from NMR data are 1.56, 15.3 and 18.5 (mole fraction) respectively.
The behaviour of water in H2O-CHCl3-CCl4 system is studied.by 1H NMR method.Water is thought to exist in the form of H2O, H2O·CHCl3, (H2O)2 and (H2O)2·CHCl3 in the system.The formation constants for the species of H2O·CHCl3, (H2O)2 and (H2O)2·CHCl3 evaluated from NMR data are 1.56, 15.3 and 18.5 (mole fraction) respectively.
1989, 6(3): 75-77
Abstract:
The effect of radiation dose on the gel content of chlorosulfonated polyethylene (CSM) has been investigated. The results indicated that with the same radiation dose the more the chlorine content in CSM, the easier was the CSM to be crosslinked. IR spectra study showed the importance of CCl group in CSM in radiation crosslinking.The presence of the antioxidants depressed the oxidation of CSM during irradiation. The tensile strength. and the elongation of the polymer increased with increasing radiation dose when the latter was low. A maximum value of the tensile strength appeared at about 110 kGy. It is also found that γ-irradiation in dose of 60-300 kGy showed no effect on the glass transition temperature and dielectric property of CSM.
The effect of radiation dose on the gel content of chlorosulfonated polyethylene (CSM) has been investigated. The results indicated that with the same radiation dose the more the chlorine content in CSM, the easier was the CSM to be crosslinked. IR spectra study showed the importance of CCl group in CSM in radiation crosslinking.The presence of the antioxidants depressed the oxidation of CSM during irradiation. The tensile strength. and the elongation of the polymer increased with increasing radiation dose when the latter was low. A maximum value of the tensile strength appeared at about 110 kGy. It is also found that γ-irradiation in dose of 60-300 kGy showed no effect on the glass transition temperature and dielectric property of CSM.
1989, 6(3): 78-80
Abstract:
Polyethylene glycols with different mean molecular weight (200-1000) were immobilizedon to silica gels. They all exhibited a certain catalytic activity in esterification and some nucleophilic substitution reactions. The influence of the chain length of polyethylene glycol,the dosage of catalyst used and the polarity of the solvents on the catalytic activity were studied. The catalysts could be used repeatedely seven times with little loss of its activity.
Polyethylene glycols with different mean molecular weight (200-1000) were immobilizedon to silica gels. They all exhibited a certain catalytic activity in esterification and some nucleophilic substitution reactions. The influence of the chain length of polyethylene glycol,the dosage of catalyst used and the polarity of the solvents on the catalytic activity were studied. The catalysts could be used repeatedely seven times with little loss of its activity.
1989, 6(3): 81-83
Abstract:
The results of determination of cupric ion in synthetic and superconductor samples by DDTC- on platinum electrodes using derivative oscillographic potentiometric technique proves the simplicity and rapidity of the method proposed by the authors.
The results of determination of cupric ion in synthetic and superconductor samples by DDTC- on platinum electrodes using derivative oscillographic potentiometric technique proves the simplicity and rapidity of the method proposed by the authors.
1989, 6(3): 84-86
Abstract:
The number of components in the blend of poly(n-octudecanyl methacrylate)(P n-OMA) and poly(vinyl acetate) (PVA) was determined by factor analysis and FTIR spectrophotometry. The results indicated that it is a compatible system.Three peaks between 1600cm-1 and 1800cm-1 in the (P n-OMA)/PVA system,which correspond to carbonyl group of (P n-OMA) PVA and the interaction of (P n-OMA) with PVA respectively, were revealed by leastsquare curve-fitting (peak resolving) method.The interaction spectrum was used to analyze the blend system for the magnitude of the interaction as a function of composition.The maximum interacticn was at 60wt% of (P n-OMA).
The number of components in the blend of poly(n-octudecanyl methacrylate)(P n-OMA) and poly(vinyl acetate) (PVA) was determined by factor analysis and FTIR spectrophotometry. The results indicated that it is a compatible system.Three peaks between 1600cm-1 and 1800cm-1 in the (P n-OMA)/PVA system,which correspond to carbonyl group of (P n-OMA) PVA and the interaction of (P n-OMA) with PVA respectively, were revealed by leastsquare curve-fitting (peak resolving) method.The interaction spectrum was used to analyze the blend system for the magnitude of the interaction as a function of composition.The maximum interacticn was at 60wt% of (P n-OMA).
1989, 6(3): 87-89
Abstract:
Acetylene polymerized by a heat aged mixture of Ti(OBu)4-AlEt3 in various solvents (alkane and aromatic hydrocarbon)yields a high performance polyacetylene film (HPPA).Being doped with iodine, the films showed an electrical conductivity of 103 S/cm at room temperature. The value was over 104 S/cm after stretching of the film. The HPPA films were high compact and stable in air and composed of relatively ordered piling up of fibrils.Its apparent density and permeability of N2 were 0.80g/cm3 and 3.2×1011 Jcm3(STP)/cm2·s·cmHg,respectively. The results of IR, TEM and X-ray diffraction indicated that the films were high crystalline and had 65-85% of cis-PA and 20-100 nm of fibre diameter.
Acetylene polymerized by a heat aged mixture of Ti(OBu)4-AlEt3 in various solvents (alkane and aromatic hydrocarbon)yields a high performance polyacetylene film (HPPA).Being doped with iodine, the films showed an electrical conductivity of 103 S/cm at room temperature. The value was over 104 S/cm after stretching of the film. The HPPA films were high compact and stable in air and composed of relatively ordered piling up of fibrils.Its apparent density and permeability of N2 were 0.80g/cm3 and 3.2×1011 Jcm3(STP)/cm2·s·cmHg,respectively. The results of IR, TEM and X-ray diffraction indicated that the films were high crystalline and had 65-85% of cis-PA and 20-100 nm of fibre diameter.
1989, 6(3): 90-92
Abstract:
A series of partly N-acylated chitosans was prepared and their solubility and water sorption were studied. It was found that N-acetyl, N-propionylchitosan (degree of acylation 55%), N-butyrylchitosan (degree of acylation 50%) dissolve fairly in water. The X-raydiffraction intensity curve of the water-soluble N-acetylchitosan showed that it was almost amorphous.
A series of partly N-acylated chitosans was prepared and their solubility and water sorption were studied. It was found that N-acetyl, N-propionylchitosan (degree of acylation 55%), N-butyrylchitosan (degree of acylation 50%) dissolve fairly in water. The X-raydiffraction intensity curve of the water-soluble N-acetylchitosan showed that it was almost amorphous.
