摘要
用Cu(phen) 2 Br/1 PEBr催化引发体系合成了分子量为 50 0 0左右的溴端基聚苯乙烯 (PS Br) .以后者为大分子引发剂 ,在Cu( phen) 2 Br存在下引发甲基丙烯酸甲酯 (MMA)或丙烯酸丁酯 (BA)聚合 ,合成了二嵌段共聚物PS b PMMA和PS b PBA ,并通过GPC、IR、1H NMR及DSC等进行了表征 .实验发现 ,丙烯酸甲酯(MA)在Phen/CuCl/CCl4 催化引发下发生爆聚反应 ,仅当和异丁基乙烯基醚 (IBVE)才发生可控的自由基共聚合反应 .当MA和IBVE的投料摩尔比为 1∶1时 ,所得共聚物中两种单体链节的组成比为 1∶1 7左右 .
A bromine capped polystyrene (PS-Br) with an M n of around 5,000 was synthesized by using Cu(phen)-2Br/1-PEBr as catalyst and initiator to polymerize styrene (St) according to atom transfer radical polymerization (ATRP) mechanism.Then, by using such a PS-Br as a macro-initiator,some block copolymers [P(St-b-MMA) and P(St-b-BA)] were also prepared through phen-ATRP.These block copolymers have been characterized by means of GPC,IR, 1H-NMR and DSC,respectively. It was found that there were no any homopolymers in these block copolymer systems and P(St-b-BA) exhibited a compatible system due to the short length of both blocks,although the miscibility between these two blcoks was poor. By using phen/CuCl/RCl as catalyst and initiator, the explosive polymerization phenomenon of methacrylate (MA) was observed. However,the copolymerization of MA and iso-butyl vinyl ether (IBVE) could be controlled in ATRP.The obtained poly(MA-co-IBVE) was characterized and discussed by using DSC and 1H-NMR.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第2期210-214,共5页
Acta Polymerica Sinica
基金
国家自然科学重点基金资助项目!(基金号 2 963 4 0 10 2)
关键词
苯乙烯
丙烯酸酯
自由基聚合
嵌段共聚物
ATRP, “Living”controlled radical polymerization, P(St-b-MMA), P(St-b-BA), Poly(MA-co-IBVE)