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Title:: Structure and properties of star shaped miktoarm isoprene-butadiene-styrene rubber

Author(s):: SHI Gong-chang; DONG Jing; ZHONG Qi-lin; WANG Yong-feng; ZHAO Zhi-chao; Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730060, China

Keywords:: isoprene-butadiene-styrene rubber; microstructure; wet skid resistance; rolling resistance; regulator; star shaped miktoarm rubber

摘要:: 采用负离子溶液聚合法，以正丁基锂为引发剂、环己烷为溶剂、十二烷基苯磺酸钠/四甲基乙二胺为复合结构调节剂、二乙烯基苯为偶联剂制备了具有高抗湿滑性和低滚动阻力的星形杂臂异戊二烯-丁二烯-苯乙烯橡胶，考察了聚合温度及结构调节剂和偶联剂用量对聚合物微观结构、动态力学性能及力学性能的影响。结果表明，聚合物中非1,4-结构链节的含量随复合结构调节剂用量增加而逐渐增大，随聚合温度升高而逐渐降低。聚合物在0 ℃的损耗因子随结构调节剂用量的增加和聚合温度的降低而逐渐增大，提高了聚合物的抗湿滑性能；而60 ℃下的损耗因子随偶联剂用量增加而逐渐减小，从而降低了聚合物的滚动阻力。此外，偶联后的聚合物分子量分布变宽，其加工性能有所改善。

Abstract:: Star shaped miktoarm isoprene-butadiene-styrene rubber with high wet skid resistance and low rolling resistance was prepared by living anionic solution polymerization with n-butyl lithium as initiator, cyclohexane as solvent, sodium dodecylbenzene sulfonate/tetramethylethylenediamine as complex regulator and divinylbenzene as coupling agent, the effects of polymerization temperature and amount of complex structure regulator and coupling agent on microstructure, dynamic mechanical pro-perties and mechanical properties of the polymer were investigated. The results showed that the content of non-1,4-unit in the polymer increased gradually with increase of the amount of complex regulator, and decreased with rise of polymerization temperature. The loss factor of the polymer at 0 ℃ increased gradually with increase of the amount of complex regulator and dropping of polymerization temperature, which improved wet resistance of the polymer; The loss factor at 60 ℃ decreased gradually with increase of the amount of coupling agent, which reduced rolling resistance of the polymer. In addition, molecular weight distribution of the polymer became wider after coupled and its processability was improved.