甲基丙烯酸丁酯和苯乙烯的原子转移自由基共聚

ATOM TRANSFER RADICAL COPOLYMERIZATION OF STYRENE AND BUTYL METHACRYLATE

研究了甲基丙烯酸丁酯（ＢＭＡ）和苯乙烯（Ｓ）这两种不同极性单体的原子转移自由基嵌段共聚和无规共聚，得到了实测分子量与理论分子量相近，分子量分布较窄的嵌段共聚物和无规共聚物．聚合过程中分子量和单体转化率成比例增加，多分散性指数变化不大．用１ＨＮＭＲ法测定共聚组成，ＫｅｌｅｎＴｕｄｏｓ法计算竞聚率．得到ｒＳｔ＝０９１，ｒＢＭＡ＝０３２．

This paper describes the application of atom transfer radical polymerization for the synthesis of controlled copolymer of styrene and butyl methacrylate by using 1 phenylethyl chloride (1 PECl),CuCl and bipyridine in a mole ratio of 1∶1∶2 at 130℃. The block copolymers of butyl methacrylate(BMA) and styrene(S) with predicted molecular weight (1×10 4～4×10 4) and narrower molecular weight distribution (1.1～1.5) were obtained.The random copolymer compositions were determined by 1H NMR spectroscopy and the reactivity ratios, γ St =0 91, γ BMA =0 32,were evaluated by the extended Kelen Tudos method.It was found that St is more reactive than BMA in atom transfer radical copolymerization.