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以1,1-二苯基己基锂(DPHL)为引发剂,SnCl4为偶联剂,采用2种聚合工艺(工艺Ⅰ和Ⅱ)合成端基改性杂臂星形溶聚丁苯橡胶[PB-Sn-(SBR)n,其中PB指聚丁二烯,SBR指丁苯橡胶]。工艺Ⅰ将PB、SBR活性聚合物按1∶3(摩尔比)充分混合后,加入SnCl4偶联得到产物A;工艺Ⅱ先将PB活性聚合物与SnCl4 1∶1(摩尔比)反应得到PB-SnCl3后,PB-SnCl3再与SBR活性聚合物以1∶3(摩尔比)偶联得到产物B。结果表明,与工艺Ⅰ相比,采用工艺Ⅱ,有更多的PB进入偶联分子。与PB(由n-BuLi引发)/星形溶聚丁苯橡胶共混胶相比,产物A的拉伸强度较低,撕裂强度、磨耗性能有显著改善,滚动阻力略高,抗湿滑性大幅提高;产物B力学性能全面优于共混胶,有更好的抗湿滑性和低的滚动阻力。
A series of end-modified, modified-arm starburst poly (styrene-butadiene terpolymer) rubbers have been synthesized using two kinds of polymerization processes (Processes I and II) using 1,1-diphenylhexyllithium (DPHL) as initiator and SnCl4 as coupling agent -Sn- (SBR) n, where PB refers to polybutadiene and SBR refers to styrene butadiene rubber]. Process Ⅰ PB, SBR active polymer by 1: 3 (molar ratio), after mixing, adding SnCl4 coupling to give the product A; Process Ⅱ first PB active polymer and SnCl4 1: 1 (molar ratio) After SnCl3, PB-SnCl3 was further coupled with the SBR active polymer at a molar ratio of 1: 3 to obtain the product B. The results show that, compared with process Ⅰ, using process Ⅱ, more PB enters the coupling molecule. Compared to PB (initiated by n-BuLi) / starburst styrene-butadiene rubber blends, product A had lower tensile strength, significantly improved tear strength and abrasion resistance, slightly higher rolling resistance, The product B has better mechanical properties than the blend glue, better wet skid resistance and lower rolling resistance.