【摘要】 以双卤代烷烃取代型双锂齐聚物为引发剂、环己烷为溶剂 ,异戊二烯 (Ⅰ )、苯乙烯 (S)单体采用一次加入的方法 ,合成了对称型双端过渡态异戊二烯 -苯乙烯嵌段共聚物S-(S-I) -I-(I-S) -S ,并对双锂体系异戊二烯、苯乙烯共聚合反应过程进行了研究 ,求得不同聚合温度 (4 0℃、5 0℃、60℃ )、不同单体 (S与I)质量比 (3∶7、4∶6、5∶5 )、不同引发剂浓度下假一级表观增长反应速度常数kp″,求得表观增长反应速度常数kp′为 0 .0 1 4 3L/(mol·min) ;求得单体 (S与I)质量比为 3∶7、4∶6、5∶5时的共聚合反应表观活化能分别为 81 .0kJ/mol、80 .9kJ/mol、79.1kJ/mol;求得不同聚合温度 (4 0℃、5 0℃、60℃ )、不同单体 (S与I)质量比 (3∶7、4∶6、5∶5 )下异戊二烯、苯乙烯共聚合反应的竞聚率更多还原

【Abstract】 The kinetic behaviours of the copolymerization of the symmetrical two-end tapered block copolymer of isoprene-styrene initiated by the dilithium init iator were studied,the apparent propagation rate constant k p″ at the differen t polymerization temperature(40℃,50℃,60℃),the different ratio of isoprene- styrene(S/I:3∶7,4∶6,5∶5;mass ratio)and the different concentration o f the dilithium initiator (: 0.525 ×10 -3 mol/L,0.788×10 -3 m ol/L,1.576×10 -3 mol/L)was given.The apparent activation energy at the d ifferent ratio of isoprene-styrene(S/I,mass ratio)was 81.1kJ/mol at 3∶7,80.9k J/mol at 4∶6, 79.1kJ/mol at 5∶5.The apparent reactivity ratio of isoprene( r 1)/styrene(r 2) copolymerization at the different polymerization temperature( 40℃,50℃,60℃) and the different ratio of isoprene-styrene(S/I: 3∶7 ,4∶6 , 5∶5 ,mass ratio)was given.更多还原