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以n-BuLi为引发剂,t-BuOK为助引发剂,四氢呋喃(THF)为极性调节剂,己烷/环己烷为溶剂,在聚合温度为60℃时进行苯乙烯-异戊二烯-丁二烯集成橡胶(SIBR)负离子三元共聚合,考察了THF/n-BuLi及t-BuOK/n-BuLi(摩尔比)对SIBR微观结构含量和玻璃化转变温度(Tg)的影响。结果表明:t-BuOK/n-BuLi为0.08时,THF/n-BuLi从5增加到20,三元共聚物中聚丁二烯和聚异戊二烯链段中1,2 -结构和3,4 -结构质量分数分别增加约2.5%和5.5%,而Tg上升10℃左右;当THF/n-BuLi为10时,t-BuOK/n-BuLi从0.04增加到0.15,其聚合物微观结构和Tg变化不明显。
Using n-BuLi as initiator, t-BuOK as initiator, tetrahydrofuran (THF) as polar modifier and hexane / cyclohexane as solvent, styrene-isoprene - butadiene rubber (SIBR) anionic terpolymerization. The effects of THF / n-BuLi and t-BuOK / n-BuLi molar ratio on the microstructure and glass transition temperature (Tg) of SIBR were investigated. The results showed that the THF / n-BuLi increased from 5 to 20 at t-BuOK / n-BuLi of 0.08, and the 1,2-structure and 3 , And the content of 4 - structure increased by about 2.5% and 5.5%, respectively, while the Tg increased by about 10 ℃. The molar ratio of t-BuOK / n-BuLi increased from 0.04 to 0.15 when THF / n-BuLi was 10, And Tg is not obvious.