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以环己烷为溶剂,正丁基锂(简称Li)为主引发剂,加入有麝香草酚钡(简称Ba)和三异丁基铝(简称Al)形成的复合引发剂体系,合成了中反-高反的嵌段聚丁二烯(PB)。通过改变Ba和Al的加入时间合成了不同结构的嵌段中反-高反PB,研究了不同引发剂添加量对嵌段中反-高反结构与玻璃化转变温度(Tg)的影响。结果表明,均聚物高反式PB只有1个Tg,为-86.9℃,而嵌段PB则有2个Tg,分别为-92.7℃和-32.7℃;随着高反式嵌段含量的减少,PB总的反式结构含量降低,但高反式嵌段的反式结构含量基本保持不变。
In cyclohexane as solvent, n-butyllithium (referred to as Li) as the main initiator, adding thymol barium (referred to as Ba) and triisobutylaluminum (Al) formed a composite initiator system, Anti-high anti-block polybutadiene (PB). The anti-high counter-PB was synthesized by changing the addition time of Ba and Al. The effects of different additives on the anti-high anti-structure and the glass transition temperature (Tg) of the block were investigated. The results showed that only one Tg of homopolymer high trans-PB was -86.9 ℃, while PB of PB had two Tg of -92.7 ℃ and -32.7 ℃ respectively. With the decrease of high trans-block content , The content of total trans structure of PB decreased, but the content of trans structure of high trans-block remained unchanged.