Preparation Of Water Soluble Hyperbranched Polymers By Redox/RAFT Self-condensing Vinyl Polymerization

Hyperbranched polymers are highly branched macromolecules with three-dimensional dentritic architecture. Due to their unique physical, for example, lower molecular size, lower intrinsic viscosity, lots of terminal groups and a lot of cavitations, interest in hyperbranched polymers is growing rapidly. Although, the synthetic techniques used to prepare hyperbranched polymers have been gradually enriched and ameliorated, using conventional free radical polymerization prepared hyperbranched polymers in a mild condition is an exciting subject. Redox system, such as Cu(III)/-OH, has been demonstrated that those system can high efficiently initiate graft or block copolymerization in a mild condition. Because the polymerization rate is much faster than the redox rate, which will lead to the polymer chain being linear. Thus, using redox system/ reversible addition fragmentation polymerization prepareing hyperbranched polymer is a novel subject.This article is divided into three chapters.In Chapter 1: Introduction. We briefly reviewed the status of hyperbranched polymers, and predicted the direction of their development.In Chapter 2: The synthesis and characterization of hyperbranched polyacrylamide. Cu(III) NI(IV) and Ce(IV) were selected as oxidant, and amide groups were selected as reductive agents.(i) The polymerization was carried out in nitrogen condition. The effects of the redox reaction on the degree of branch, conversion, molecular weight, and value were investigated.(ii) The polymerization was carried out in oxgen condition. The effects of the redox reaction on the degree of branch, conversion, molecular weight, and value were investigated.(iii) The polymerization was carried out using reversible addition fragmentation polymerization. The effects of the redox reaction on the degree of branch, conversion, molecular weight, and value were investigated.In Chapter 3: The synthesis and characterization of hyperbranched Poly(methyl-6-methacryloyl-a- D-glucoside). Ce(IV) were selected as oxidant, and hydroxy groups were selected as reductive agents. The polymerization was carried out using reversible addition fragmentation polymerization. The effects of the redox reaction on the degree of branch, conversion, molecular weight, and value were investigated.In Chapter 4: The synthesis and characterization of hyperbranched poly(N-hydroxymethyl acrylamide). Ce(IV) were selected as oxidant, and amide groups and amide groups were selected as reductive agents. The polymerization was carried out using reversible addition fragmentation polymerization. The effects of the redox reaction on the degree of branch, conversion, molecular weight, and value were investigated.In Chapter 5: According with the reports, the glucose monomer which can be used to prepare hyperbranched polymer via redox/self condensing vinyl polymerization and reversible addition fragmentation transfer agent were synthesized.