原子转移自由基聚合合成聚(苯乙烯-g-丙烯酸丁酯)

Synthesis of the Graft Copolymer of Poly (styrene g butylacrylate) by ATRP

以线型氯甲基化聚苯乙烯（ＰＳ－ＣＨ２Ｃｌ）为大分子引发剂，引发丙烯酸丁酯原子转移自由基聚合，合成了聚苯乙烯－丙烯酸丁酯接枝共聚物［Ｐ（Ｓ－ｇ－ＢＡ）］。ＰＳ－ＣＨ２Ｃｌ是由ＰＳ通过氯甲基化反应合成，ＰＳ链上－ＰｈＣＨ２Ｃｌ的分布是统计均匀。建立了该接枝共聚物的纯化方法，纯化后接枝共聚物的接枝效率可达９６．５％。用ＧＰＣ跟踪了大分子引发剂在本体中的引发和接枝反应过程。研究结果表明，反应速率对单体浓度呈一级动力学特征，接枝共聚物的相对分子质量随单体转化率线性增加，分子量分布变窄，聚合反应显示出可控特征。

Graft copolymers of poly (styrene g butylacrylate) [P(S g BA)] were synthesized through ATRP of butylacrylate (BA) onto the backbone of the linear chloromethylated polystyrene (PS CH 2Cl) at the PhCH 2Cl groups. The PS CH 2Cl, in which small numbers of PhCH 2Cl groups distributed randomly along the PS chains, was prepared with linear PS chloromethylated by chloromethyl ether. The purification of the P(S g BA) can be carried out by the method created in our study. After purification, the grafting efficiency measured was as high as 96.5%. The evolution of the initiation of the PS CH 2Cl macroinitiator and the grafting polymerization in bulk were studied. It was showed that during the grafting polymerization a constant number of active species were suggested from the linearity of the kinetics plots. The molecular weight of the P(S g BA) increased with the monomer conversion of the BA and the molecular weight distribution became narrow, which would then showed a “living” feature.