A novel amphiphilic AB(2) star copolymer synthesized by the combination of ring-opening metathesis polymerization and atom transfer radical polymerization

作者：Liu Jingwei; Li Jinxin; Xie Meiran^*; Ding Liang; Yang Dan; Zhang Liya

来源：Polymer, 2009, 50(22): 5228-5235.

DOI：10.1016/j.polymer.2009.09.029

• Ring-opening metathesis polymerization (ROMP)
• Macroinitiator
• Atom transfer radical polymerization (ATRP)

A new amphiphilic AB(2) star copolymer was synthesized by the combination of ring-opening metathesis polymerization (ROMP) and atom transfer radical polymerization (ATRP). Two different routes (methods A and B) were employed firstly to prepare the poly(oxanorbornene)-based monotelechelic polymers as the hydrophobic arm beating dibromo-ended group via ROMP in the presence of two different terminating agents catalyzed by first generation Grubbs catalyst. The values of capping efficiency (CE) of the polymers were determined by NMR, which were 94% and 67% for methods A and B, respectively. Then, the dibromo-ended ROMP polymers were used as the macroinitiators for ATRP of 2-(dimethylamino)ethyl methacrylate (DMAEMA) to produce two hydrophilic arms. The prepared amphiphilic AB(2) star copolymers poly(7-oxanorborn-5-ene-exo,exo-2,3-dicarboxylic acid dimethyl ester)-block-bis[poly(2(dimethylamino)ethyl methacrylate)] (PONBDMn-b-(PDMAEMA(m))(2)) with a fixed chain length of hydrophobic PONBDM and various hydrophilic PDMAEMA chain lengths can self-assemble spontaneously in water to form polymeric micelles, which were characterized by dynamic light scattering, atom force microscopy, and transmission electron microscopy measurements.

• 出版日期2009-10-20
• 单位华东师范大学