Citation: GAO Jianping, TIAN Ruchuan, ZHANG Liming. GRAFT COPOLYMERIZATION OF VINYL MONOMERS ONTO STARCH INITIATED BY TRANSITION METAL-THIOUREA REDOX SYSTEMS[J]. Chinese Journal of Polymer Science, ;1996, 14(2): 163-171. shu

GRAFT COPOLYMERIZATION OF VINYL MONOMERS ONTO STARCH INITIATED BY TRANSITION METAL-THIOUREA REDOX SYSTEMS

Received Date: 20 December 1994

In this paper, the capabilities of grafting acrylonitrile (AN) onto starch initiatedby Fe(III)-TU, V(V)-TU, Cr(VI)-TU, Mn(VII)-TU redox systems were compared in thepresence of sulfuric acid of different concentrations. It was shown that the grafting capabili-ty of Mn(VII)-TU is the highest in these initiating systems. Using Mn (VII-TU as initia-tor, the effects of various acids (HClO4, H2SO4, HNO3, HCl) on the graft copolymerizationof acrylonitrile onto starch were discussed, and the capabilities of graft copolymerization of methyl methacrylate (MMA),acrylamide (AM),acrylic acid (AA) onto starch were investigated.The experimental results show that the order of the influences of different acids is HCIO4>H2SO4>HNO3>HC1,and the order of grafting capabilities of different monomers grafted noto starch is MMA>AN>AM>AA.The structure and morphology of graft copolymers were studied with infrared spectroscopy and scanning electron microscopy.The size,shape and roughness of surface of the grafted starch granules are changed after grafting.
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