A reverse ATRP process catalyzed by nickel-based (NiCl2/PPh3) system

作者：Qin DQ^*; Qin SH; Qiu KY

来源：Acta Polymerica Sinica, 2002, (1): 108-112.

• living radical polymerization
• nickel-based catalyst ( NiCl2/PPh3 diethyl 2,3-dicyano-2,3-diphenylsuccinate
• styrene
• methyl methacrylate

Radical polymerization of styrene and methyl methacrylate was investigated using a nickel-based initiating system, i.e. DCDPS/NiCl2/PPh3, in which diethyl 2,3-dicyano-2,3-diphenyl-succinate (DCDPS) is a hexasubstituted ethane thermal iniferter and the nickel based catalyst reacted from Ni2+ to Ni1+. The polymerization of styrene (St) was successfully controlled in bulk at 120degreesC. The kinetics studies showed that the kinetics is first order in monomer. The number average molecular weight M. increased linearly with conversion from 57 100 to 126000, and the molecular weight distributions(M-w/M-n) were around 1.5 as the monomer conversion was increased from 38% to 86%. Well defined polystyrene with alpha-(carbethoxycyanophonyl) methyl-omega-chlorine end groups was obtained from the polymerization of St with DCDPS/NiCl2/PPh3 initiating system, and the polymerization proceeded via reverse ATRP. While the polymerization behavior of methyl methacrylate ( MMA) initiated with the same system was absolutely different. The molecular weights of so-obtained PMMA did not increase with the monomer conversions and at the same time the molecular weight distributions kept narrow ( M-w/M-n = 1.19) during the polymerization.

• 出版日期2002-2
• 单位北京大学