研究了用自行发明的多官能团有机锂引发体系一步法合成的星型中乙烯基聚丁二烯橡胶(MVBR)的分子量、乙烯基含量、偶联臂数对其加 工流变性能、静态、动态力学性能的影响。结果表明,单臂分子量为8万、乙烯基含量为49.7 %、平均偶联臂数为3.8时,胶料的加工流变性能优异、力学强度高、动态生热低。与线型MVB R和BR相比,星型MVBR的抗湿滑性好、滚动阻力低。星型MVBR是低生热轮胎胎面的理想用胶。
The influence of molecular weight, vinyl content, number of arm of star MVBR coupled with SnCl4 to its processing, flow, physical mechanical and dynamic properties has been studied. Star MVBR was prep ared by anionic polymerization process with new invented multi-functional group organic lithium initiator by our college. The results show that star MVBR, whos e molecular weight of one arm attaints to 80000, vinyl content is about 49 .7% and average number of arm coupled with SnCl4 is 3.8, has good proces sing and flow property, high physical mechanical properties and low heat accumul ation. Compared with linear MVBR and cis-BR, star MVRB has low rolling energy l oss and good wet grit and is an excellent tire tread material.
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