ATRP/RAFT技术合成刷型多元共聚物

Synthesis of Brush Copolymer by ATRP/RAFT Technology

以十二烷基三硫代碳酸酯(DDMAT)为链转移剂,通过可逆加成-断裂转移自由基聚合(RAFT)技术制备了分子量分布较窄(多分散性指数 PDI 为1.54)的二嵌段共聚物聚对氯甲基苯乙烯(PVBC-b-PS),再以PVBC结构中的苄基氯为引发点,借助原子转移自由基聚合(ATRP)方法在大分子主链上接枝甲基丙烯酸甲酯(MMA),得到刷型三元共聚物PVBC-b-PS-g-PMMA( PDI =3.38,分子量43 000,VBC重复单元接枝率为12.2%)。

The diblock copolymer polychloromethyl styrene(PVBC-b-PS)with narrow molecular weight distribution(1.54)was prepared by reversible addition fracture transfer(RAFT)technology with dodecyl trithiocarbonate(DDMAT)as chain transfer agent.Methyl methacrylate(MMA)chains were grafted onto the backbone of PVBC-b-PS by the atom transfer radical polymerization(ATRP)method,from the benzyl chloride groups(initiation points)in the PVBC units to obtain brush-type terpolymer PVBC-b-PS-g-PMMA( PDI =3.38, M n =43 000,VBC repeat unit graft ratio of 12.2%).