RAFT Living Free Radical Polymerization Of St And MMA In Different Reaction Media

Living free radical polymerization is one of the fastest growing points in polymer chemistry recently for having virtues both free radical polymerization and living free radical polymerization. There are four kinds of living free radical polymerization principally, Initiator-transfer agent-terminator (Iniferter), 2,2,6,6-tetramethyl-1- pipendinyloxyl (TEMPO), Reversible addition fragmentation chain transfer (RAFT), Atom Transfer Radical Polymerization (ATRP ) and RATRP. It gets more attention in Reversible Addition-fragmentation chain Transfer (RAFT) mediated living free radical polymerization owing to its mild reaction conditions, its effectiveness in controlling molecular weight and polydispersity , its suitable to a wide range of monomers as well as its applicability for multifarious quomodo of polymerization.RAFT living free radical polymerization in multifarious mediums has been investigated. Firstly, RAFT agent 1-phenylethyl dithiobenzoate was synthesized using two methods and the better one was chosen by comparison. The rarefied was used as transfer agent for the RAFT polymerization of MMA and St in bulk and toluene, the polymerizations were found with living characters. When PMMA or PS was used as macromolecular chain transfer agent and the other monomer (St or MMA) was used as the second monomer, the block polymer PMMA-b-PS and PS-b-PMMA were prepared and their block structure were analyzed via FT-IR, 13C-NMR, GPC and DSC. We also found that the control of RAFT polymerization was better when MMA was used as monomer or PMMA was used as macromolecular chain transfer agent than St and PS and the reason was also discussed. For the block polymerization, farthing initiator AIBN could accelerate the transfer of the macromolecular chain transfer agent and the rapid polymerization rate would be maintained and the polymerization would be better controlled.The RAFT miniemulsion polymerization of MMA and St was investigated. The...