无规聚1-丁烯及聚乙烯-聚1-丁烯两嵌段共聚物的合成与表征

摘要

Through polar modifier dipiperidinoethane in modes of one-step and two-step adding, the polybutadiene with mass fraction of 1,2-structure of 98.5％ and the stereoblock polybutadiene with different block ratios were obtained by anionic polymerization respectively. And the two kinds of polybutadiene were hydrogenated by nickel catalyst to synthesize atactic poly(l-butene) and polyethylene-poly(l-butene)block copolymer, and the polymers were characterized. The results showed that the atactic poly (l-butene) had high stereoirregularity and its glass transition temperature (Tg )was -24. 5 - -22.7℃. The polyethylene-poly(1-butene) block copolymer had Tg of poly ( 1-butene) at low temperature region and a melting endothermic peak of polyethylene at high temperature region, and the Tg and crystallinity increased with increasing the content of polyethylene block.%通过一步或分步添加极性调节剂二哌啶乙烷,采用负离子聚合技术合成了1,2-结构质量分数大于98.5%的聚丁二烯及不同嵌段比的低乙烯基-高乙烯基嵌段聚丁二烯,然后使用镍系催化剂对其进行加氢反应,合成了无规聚1-丁烯和聚乙烯-聚1-丁烯两嵌段共聚物,并对聚合物进行了表征.结果表明,无规聚1-丁烯的无规化程度很高,玻璃化转变温度(Tg)为-24.5～-22.7℃;两嵌段共聚物在低温区出现了聚1-丁烯的Tg,而在高温区则出现了聚乙烯的熔融吸热峰,且随着聚乙烯嵌段含量的增加,Tg值略有升高,结晶度增大.