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采用Grubbs-Ⅱ(G 2)催化剂催化高乙烯基聚丁二烯橡胶(HVBR)和乳聚丁苯橡胶(ESBR)进行烯烃的交叉复分解反应,并研究了G 2的用量对相对分子质量及玻璃化转变温度(T_g)的影响。结果表明,HVBR和ESBR的分子链内和分子链间发生一定程度的交叉互换,制备出不同链段的线型和含支链的丁苯橡胶。随着G 2用量的增加,数均分子量先增加后变小,相对分子质量分布先变窄后变宽。与未采用G 2作催化剂的试样相比,G 2的加入使得HVBR链段的T_g下降,ESBR链段的T_g上升。
Grubbs-Ⅱ (G 2) catalyst was used to catalyze the cross-metathesis reaction of high vinyl-based polybutadiene rubber (HVBR) and emulsion polybutadiene styrene-butadiene rubber (ESBR). The effect of G 2 dosage on the relative molecular mass and glass The impact of the transition temperature (T_g). The results showed that the linear and branched styrene-butadiene rubbers (SBRs) with different chain segments were prepared by some cross-exchange between the intra- and inter-molecular chains of HVBR and ESBR. With the increase of the amount of G 2, the number average molecular weight firstly increased and then decreased, and the relative molecular mass distribution narrowed first and then widened. Compared with the sample without G 2 as catalyst, the addition of G 2 decreased the T_g of HVBR segment and the T_g of ESBR segment increased.