聚合转化率对高反式丁二烯-异戊二烯共聚橡胶微观结构及性能的影响

研究在10 L聚合釜中由TiCl₄/MgCl₂负载型催化剂催化合成高反式丁二烯-异戊二烯共聚橡胶时，聚合转化率对共聚物的组成、结构和性能的影响。结果表明，丁二烯/异戊二烯的初始摩尔比为0.2时，随着聚合转化率的升高，聚合物中丁二烯单元的平均组成下降；不同聚合转化率下共聚物丁二烯单元中反式1，4-结构摩尔分数均大于0.98，异戊二烯单元中反式1，4-结构摩尔分数均大于0.97，聚合转化率对共聚物的微观结构没有明显影响。聚合转化率提高使共聚物生胶拉伸强度提高，拉断伸长率和硬度变化不大；聚合转化率为60％的硫化胶具有良好的综合性能。;The effect of the conversion rate on the composition，micro-structure and properties of high trans-butadiene-isoprene copolymer rubber，which was synthesized in a 10 L autoclave using TiCl₄/MgCl₂ as supported catalyst，was investigated.It was found that when the initial mole ratio of butadiene/isoprene was 0.2，the average mole fraction of butadiene unit in copolymer decreased as the conversion rate increased；the conversion rate had little effect on the micro-structure of copolymer，and the mole fraction of the trans-1，4-structure in butadiene unit was always greater than 0.98 and that in isoprene unit was always greater than 0.97 at different conversion rates；the greater conversion rate gave the improved tensile strength of raw copolymer，but similar elongation at break and hardness；and a vulcanizate with excellent comprehensive properties was obtained when the copolymer was synthesized at 60% conversion rate