星型氢化无规共聚物HSSIBR的制备与表征

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。

Preparation and Characterization of Star-Shaped Hydrogenated HSSIBR

The star-shaped styrene-isoprene-butadiene ternary random copolymer SSIBR was synthesized using the anionic polymerization method with divinylbenzene(DVB) as coupling agent.The SSIBR was hydrogenated and HSSIBR was obtained with the nickel naphthenate(Ni)/triisobutyl aluminum(Al) catalyst system,while the temperature was 60 ℃,hydrogenated pressure was 4 MPa and the reaction time was 4 hours.The effect of molecular weight and DVB/Li content of SSIBR on coupling efficiency and the hydrogenation degree of SSIBR were investigated in details.In this work,1H-NMR,TGA,DSC and XRD were used to evaluate the HSSIBR.Meanwhile,the HSSIBR was investigated as viscosity index improvers in oil.It is proved that the coupling efficiency of SSIBR can reach 86.8% using DVB as coupling agent,the coupling efficiency declines with the increase of molecular weight;the initial decomposition temperature of HSSIBR raises 55 ℃ compared with SSIBR and the heat resistance and the aging resistance are improved obviously;the shearing stability of HSSIBR as viscosity index improvers is improved and the low temperature performance increases significantly.