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研究了对丙烯的高速间规活性聚合有效的Cs-对称胺芴二甲基钛络合物-干燥修饰甲基铝氧烷(dMMAO)催化剂体系对乙烯的聚合行为的影响。结果表明:乙烯常压聚合表现出稳定的聚合速率,聚合活性达到282 kg-PE/(mol-Ti·h);利用间歇聚合法进行乙烯聚合的单体转化率均达到99%以上,说明催化体系无失活现象,但得到的聚乙烯在135℃下不溶于GPC溶剂邻二氯苯中;采用先加入定量丙烯单体聚合完全结束后,再加入定量乙烯单体进行聚合的方法合成了sPP-b-PE嵌段共聚物。嵌段共聚合的结果说明乙烯聚合是以活性聚合的方式进行的。利用该催化体系还合成了丙烯-乙烯丙烯双嵌段共聚物(sPP-b-E/P)以及丙烯-乙烯丙烯-丙烯(sPP-b-E/P-b-sPP)三嵌段共聚物。
The effect of Cs-symmetrical amine fluorene dimethyl titanium complex-dried modified methylaluminoxane (dMMAO) catalyst system on the polymerization of ethylene was studied. The results showed that the polymerization of ethylene at atmospheric pressure showed a steady polymerization rate of 282 kg-PE / (mol-Ti · h). The monomer conversion of ethylene polymerized by batch polymerization was above 99% The system has no deactivation phenomenon, but the obtained polyethylene is insoluble in o-dichlorobenzene at 135 ° C. in the GPC solvent. After finishing the polymerization by adding the quantitative propylene monomer and then adding the quantitative ethylene monomer to the polymerization, sPP -b-PE block copolymer. Block copolymerization results show that the polymerization of ethylene is carried out by living polymerization. Propylene-ethylene propylene diblock copolymer (sPP-b-E / P) and propylene-ethylene propylene-propylene (sPP-b-E / P-b-sPP) triblock copolymer were also synthesized by this catalytic system.