共单体
聚乙烯
共聚物
支化(高分子化学)
乙烯
高分子化学
催化作用
聚合
聚合物
纳塔
化学
材料科学
有机化学
作者
Yang Liu,Yawei Qin,Jin‐Yong Dong
出处
期刊:ACS omega
[American Chemical Society]
日期:2021-01-04
卷期号:6 (1): 675-679
被引量:6
标识
DOI:10.1021/acsomega.0c05211
摘要
1,9-Decadiene/ethylene copolymerization is assessed as a way for Ziegler–Natta catalysts to access long chain-branched polyethylene (PE). A MgCl2/9,9-bis-(methoxymethyl)fluorine/TiCl4 catalyst with triethylaluminium as a cocatalyst is exemplified for the task. 1,9-Decadiene was found to induce a substantial comonomer effect on catalyst activity and continuing decreases of PE molecular weight. Both the double bonds of 1,9-decadiene were poorly reactive during polymerization, of which the polymer chain-attached was even much less reactive than the original one. As a consequence, at decreased feeds, 1,9-decadiene gave small amounts (<0.1 mol %) of pendant vinyl groups to PE without prompting the formation of long-chain branches. Long chain-branching was realized at increased 1,9-decadiene feeds, which was however accompanied by proportional gelation.
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