摘要
采用基团转移聚合、阴离子聚合以及高分子偶合反应的方法，合成了一种结构明确、链长均匀和分子量可控的聚苯乙烯接枝聚甲基丙烯酸甲酯．主链聚苯乙烯由阴离子聚合得到，并进行溴甲基化．支链活性聚甲基丙烯酸甲酯由基团转移聚合制备．经偶合反应后得到分子量为３×１０４～７×１０４、多分散性指数Ｄ为１．２～１．４的接枝共聚物．溴甲基化聚苯乙烯和活性聚甲基丙烯酸甲酯的偶合反应活性随分子量的增大而降低，理想的反应温度为－２０℃．用１ＨＮＭＲ、ＧＰＣ和ＤＳＣ表征接枝产物．和均聚物相比，共聚物的玻璃化温度较低．
A novel well defined graft copolymer(PS g PMMA) with control over the length of both backbone and side chain was synthesized by coupling reaction of living polymethyl methacrylate with bromomethylated polystyrene. The backbond polymer was prepared by anionic polymerization of styrene with n butyllithium followed by bromomethylation using C 8H 17 OCH 2Br/SnCl 4 . The living PMMA was prepared by group transfer polymerization of MMA. The graft copolymers with narrow molecular weight distribution, D =1 2￣1 4, at the n of around 3×10 4￣7×10 4 were obtained. The reactivity of the BMPS and living PMMA decrease with increasing of their molecular weight, favorable reaction temperature was -20 ℃. Characterization of the product include 1H NMR, 13 C NMR, GPC and DSC, comparing with the homopolymer PS and PMMA, the copolymer has a lower glass temperature.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第7期1162-1165,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
国家教委留学回国人员启动基金
关键词
PS-g-PMMA
接枝共聚物
PMMA
共聚物
Anionic polymerization
Group transfer polymerization
Living polymer
Coupling reaction
Graft copolymer
