端羟基聚异戊二烯及其共聚物的合成与表征

Synthesis and characterization of hydroxyl-terminated polyisoprene and its copolymer

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聚异戊二烯共聚物,并采用IR、1HNMR、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。

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.