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以含锡有机锂为引发剂、四氢呋喃(THF)为极性调节剂进行了苯乙烯-异戊二烯-丁二烯集成橡胶(SIBR)的负离子三元共聚合,研究了温度、调节剂用量及引发剂浓度对其反应动力学的影响及SIBR的性能。结果表明,随着温度升高及THF用量和引发剂浓度的增加,各单体的表观反应速率逐渐增加;随着THF用量的增加,增长反应的表观活化能和频率因子逐渐减小;在同一条件下,单体的表观增长反应速率常数由大到小依次为丁二烯、苯乙烯和异戊二烯。与正丁基锂体系相比,用锡锂合成的SIBR具有更低的滚动阻力、更好的湿抓着性和物理机械性能。
Anionic ternary copolymerization of styrene-isoprene-butadiene rubber (SIBR) was carried out with tin-containing organolithium as initiator and tetrahydrofuran (THF) as polar modifier. The effects of temperature, dosage of adjusting agent And initiator concentration on its reaction kinetics and SIBR performance. The results showed that the apparent reaction rate of each monomer increased with the increase of temperature and the amount of THF and the concentration of initiator. The apparent activation energy and frequency factor of growth reaction decreased with the increase of the amount of THF. Under the same conditions, the apparent rate of increase of monomer reaction rate from big to small are butadiene, styrene and isoprene. SIBR synthesized with tin-lithium has lower rolling resistance, better wet grip, and physical-mechanical properties than n-butyl lithium systems.