端羟基聚异戊二烯及其共聚物的合成与表征

以仲丁基锂为引发剂，引发异戊二烯本体负离子聚合，再用环氧丙烷甲醇终止法合成了端羟基聚异戊二烯；然后利用端羟基聚异戊二烯的活性端羟基，引发丙交酯的开环聚合制备了聚乳酸一聚异戊二烯共聚物，并采用IR、^1H—NMR、TG等测试手段对产品进行了表征。结果表明，通过改变仲丁基锂及环氧丙烷的用量，可合成相对分子质量及羟基含量可控的且1，4-结构质量分数超过87．5％的端羟基聚异戊二烯。

Synthesis and characterization of hydroxyl-terminated polyisoprene and its copolymer

Hydroxyl-terminated polyisoprene was synthesized by anionic polymerization. It was ini tiated by sec-butyllithium and terminated by propyleneoxide and methanol. Initiated by the active hy droxyl group of hydroxyl-terminated polyisoprenes, polylactide-polyisoprene copolymer was prepared by ring-opening polymerization. The products were characterized by IR, ^1H-NMR, TG. The results showed that the molecular weight and hydroxyl group content of polyisoprene could be controlled by varying the quantity of sec-butyllithium and propyleneoxide. And the mass percentage of 1,4-structure excesses 87.5 % in the final hydroxyl-terminated polyisoprene.