Atom transfer radical copolymerization(ATRP) of styrene(St) and N cyclohexylmaleimide(NCMI) with the CuBr/bpy catalyst in anisole, initiated by 1 phenylethyl bromide(1 PEBr) or tetra (bromomethyl)benzene(TBMB), afford...Atom transfer radical copolymerization(ATRP) of styrene(St) and N cyclohexylmaleimide(NCMI) with the CuBr/bpy catalyst in anisole, initiated by 1 phenylethyl bromide(1 PEBr) or tetra (bromomethyl)benzene(TBMB), afforded well defined copolymer with predetermined molecular weights and low polydispersities, M w/ M n<1.5. Other monomer pairs such as methyl methacrylate(MMA)/NCMI, St/ N phenylmaleimide, MMA/ N phenylmaleimide were studied, too. The influences of several factors, such as temperature, solvent and monomer’s ratio on the copolymerization with the CuBr/bpy catalyst system were subsequently investigated. The apparent activation energy of St(MMA)and NCMI was deduced from the kinetics figure of different temperatures. Using TBMB as the initiator produced four armed star copolymer. The heat resistance of the resultant copolymer has been improved by increasing the NCMI. [WT5HZ]展开更多
文摘Atom transfer radical copolymerization(ATRP) of styrene(St) and N cyclohexylmaleimide(NCMI) with the CuBr/bpy catalyst in anisole, initiated by 1 phenylethyl bromide(1 PEBr) or tetra (bromomethyl)benzene(TBMB), afforded well defined copolymer with predetermined molecular weights and low polydispersities, M w/ M n<1.5. Other monomer pairs such as methyl methacrylate(MMA)/NCMI, St/ N phenylmaleimide, MMA/ N phenylmaleimide were studied, too. The influences of several factors, such as temperature, solvent and monomer’s ratio on the copolymerization with the CuBr/bpy catalyst system were subsequently investigated. The apparent activation energy of St(MMA)and NCMI was deduced from the kinetics figure of different temperatures. Using TBMB as the initiator produced four armed star copolymer. The heat resistance of the resultant copolymer has been improved by increasing the NCMI. [WT5HZ]
