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以二乙烯基苯(DVB)为偶联剂,环己烷为溶剂,通过阴离子聚合制备了星型苯乙烯-异戊二烯-丁二烯三元无规共聚物(SSIBR);以环烷酸镍和三异丁基铝为催化剂,在60℃和4.0 MPa氢压下反应4 h,制备了氢化度为100%氢化星型苯乙烯-异戊二烯-丁二烯三元无规共聚物(HSSIBR)。考查了DVB/Li用量、单臂相对分子质量对聚合物偶联效率(CE)和加氢反应的影响。采用1H-NMR、TGA、DSC、XRD对HSSIBR进行分析表征,并应用自制的HSSIBR作为润滑油黏度指数改进剂对其性能进行测试。结果表明,以DVB为偶联剂得到SSIBR偶联效率最高达到86.8%,单臂相对分子质量增加,偶联效率下降;HSSIBR比SSIBR的初始分解温度提高了55℃,耐热耐老化性得到了明显改善;HSSIBR作为润滑油黏度指数改进剂,其剪切稳定性得到改善,低温性能明显提高。
A star-shaped styrene-isoprene-butadiene ternary random copolymer (SSIBR) was prepared by anionic polymerization using divinylbenzene (DVB) as coupling agent and cyclohexane as solvent. Acid nickel and triisobutylaluminum as catalyst, and reacted at 60 ℃ under 4.0 MPa hydrogen pressure for 4 h to prepare a hydrogenated star-shaped styrene-isoprene-butadiene ternary random copolymer Material (HSSIBR). The effects of DVB / Li dosage, molecular weight of single arm on the coupling efficiency (CE) and hydrogenation of the polymer were investigated. The HSSIBR was characterized by 1H-NMR, TGA, DSC and XRD. The self-made HSSIBR was used as lubricant viscosity index improver to test its performance. The results showed that the efficiency of SSIBR coupling with DVB as the coupling agent was up to 86.8%, the molecular weight of one arm was increased and the coupling efficiency was decreased. The initial decomposition temperature of HSSIBR was 55 ℃ higher than that of SSIBR, and the heat aging resistance was obtained Significantly improved; HSSIBR as a lubricant viscosity index improver, shear stability improved, low temperature performance was significantly improved.