用烷基锂引发的丁二烯“活性”聚合,通常只能得到分子量分布较窄的聚合物。这类聚合物的门尼粘度较高,不易加工,且易冷流。为了解决这些问题,一般是合成分子量分布较宽且有一定支化的聚合物。但在以往的合成宽分布聚合物的方法中,大多只能得到非“活性”聚双烯烃,因而无法进行“活性”高分子的一些典型反应,如嵌段、接枝及偶 Polymerization of butadiene with alkyllithium-initiated butadiene generally gives only narrow molecular weight distribution polymers. The Mooney viscosity of these polymers is high, not easy to process, and easy to cold flow. In order to solve these problems, it is generally to synthesize polymers with broad molecular weight distribution and certain branching. However, in the conventional methods for synthesizing broadly distributed polymers, most of them can only obtain non-living polyolefins and thus can not perform some typical reactions of “living” polymers such as block, graft and even