阳离子聚合
异丁烯
聚合
聚合物
路易斯酸
化学
位阻效应
高分子化学
催化作用
溶剂
三元运算
有机化学
共聚物
计算机科学
程序设计语言
作者
Ling Cai,Bo Liu,Xinli Liu,Dongmei Cui
出处
期刊:Polymer
[Elsevier]
日期:2022-01-01
卷期号:241: 124539-124539
被引量:1
标识
DOI:10.1016/j.polymer.2022.124539
摘要
We report here by using a binary initiating system containing a sterically bulky Lewis super acid Al(C 6 F 5 ) 3 together with cumyl chloride (CumCl), the cationic polymerization of isobutylene was realized at temperatures varying from −60 °C to 15 °C in a non-halogenated solvent to afford polymers with medium molecular weights from 0.9 × 10 4 to 14.8 × 10 4 g·mol −1 . Moreover, addition of EDs (EDs = OPh 2 , SPh 2 and NPh 3 ) to the above system generated ternary systems, leading to obvious improvement of the catalytic performances. Among these systems, Al-CumCl-OPh 2 was mostly efficient to transfer up to 20,000 equiv. IB into PIBs with high molecular weights up to 35.5 × 10 4 g·mol −1 at −40 °C. The activation energies ( E p ) for the polymerization degree with different initiating systems were determined, suggesting that the molecular weight of PIB was strongly dependent on the polymerization temperature. • Al(C 6 F 5 ) 3 along with CumCl exhibited high activity in the synthesis of PIB. • Adopting such weak base as OPh 2 results in remarkable high efficiency to give high molecular weight polymer. • High molecular weight PIBs were obtained at relatively high reaction temperatures. • The weak interaction between the OPh 2 and cation was first monitored by the NMR technique at different temperatures.
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