Citation: ZHANG Liansheng, A.F. Johnson. RADICAL GRAFTING REACTIONS ONTO STARCH AND OTHER WATER-SOLUBLE COPOLYMERS IN ISOLATED GEL DROPLETS[J]. Chinese Journal of Polymer Science, ;1993, 11(2): 144-152. shu

RADICAL GRAFTING REACTIONS ONTO STARCH AND OTHER WATER-SOLUBLE COPOLYMERS IN ISOLATED GEL DROPLETS

ZHANG Liansheng ^{*，A.F.Johnson} ,
A.F. Johnson

Received Date: 23 December 1991

A novel radical grafting copolymerization process has been designed for water-soluble polymers which avoids the problems of conducting grafting reactions in highly viscous polymerization media. A variety of water-soluble graft copolymers having starch or dextran as the backbone chain with grafted side chains of polyacrylamide (—AM—), poly (acrylic acid ) (—AA—), poly (acrylamide-co-acrylic acid) (—AM—NH4AA—) or poly ( acrylamide-co-2-acryiamido-2-methyl-l-propanesulphinic acid) (—AM—AMPS—) have been synthesized in gel droplets using a ceric sulphate redox initiator,and their properties compared.The reaction conditions were optimized taking into account reaction kinetic data and the observed properties of the products produced under different reaction conditions.The effects of the ratios of [backbone]/[graft monomer],[AM]/[AA]/[AMPS],[Ce4+]/[S2O8] nad pH value on the reaction rate,conversion,grafting degree,grafted chain length and the product molecular weight have been investigated.
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