战术性
共聚物
高分子化学
聚合物
聚乙烯
聚苯乙烯
环己烷
材料科学
乙烯
氯化铝
路易斯酸
聚丙烯
铝
氯化物
聚合
化学
有机化学
催化作用
出处
期刊:Journal of polymer science
[Wiley]
日期:1970-01-01
卷期号:8 (1): 215-223
被引量:36
标识
DOI:10.1002/pol.1970.150080120
摘要
Abstract Treatment of a cyclohexane solution of low density polyethylene and polystyrene with anhydrous aluminum chloride causes chemical reaction between the two polymers which results in the formation of a graft copolymer. The initial copolymer‐forming reaction is very rapid, and prolonged contact of the polymers with aluminum chloride causes subsequent degradation in molecular weight. Treatment of separate solutions of polyethylene, isotactic polypropylene, and ethylene–propylene copolymers with aluminum chloride was studied as a function of time. The intrinsic viscosities of the polymers dropped from initial values of 2.4–6.5 to 0.55–0.85 in 5 min, followed by a slower decline over the next 2 hr. In the case of polypropylene, the low molecular weight fragments largely retained the isotactic structure, which demonstrates that stereochemical isomerization is not a major reaction.
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