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Open AccessArticle

Cationic Copolymerization of Isobutylene with 4-Vinylbenzenecyclobutylene: Characteristics and Mechanisms

1
Beijing Key Lab of Special Elastomeric Composite Materials, Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2
College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(1), 201; https://doi.org/10.3390/polym12010201
Received: 7 November 2019 / Revised: 1 January 2020 / Accepted: 3 January 2020 / Published: 13 January 2020
(This article belongs to the Special Issue Elastomers: From Theory to Applications)
A random copolymer of isobutylene (IB) and 4-vinylbenzenecyclobutylene (4-VBCB) was synthesized by cationic polymerization at −80 °C using 2-chloro-2,4,4-trimethylpentane (TMPCl) as initiator. The laws of copolymerization were investigated by changing the feed quantities of 4-VBCB. The molecular weight of the copolymer decreased, and its molecular weight distribution (MWD) increased with increasing 4-VBCB content. We proposed a possible copolymerization mechanism behind the increase in the chain transfer reaction to 4-VBCB with increasing of feed quantities of 4-VBCB. The thermal properties of the copolymers were studied by solid-phase heating and crosslinking. After crosslinking, the decomposition and glass transition temperatures (Tg) of the copolymer increased, the network structure that formed did not break when reheated, and the mechanical properties remarkably improved. View Full-Text
Keywords: cationic polymerization; 4-vinylbenzocyclobutene; random copolymer; crosslink cationic polymerization; 4-vinylbenzocyclobutene; random copolymer; crosslink
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MDPI and ACS Style

Chen, Z.; Li, S.; Shang, Y.; Huang, S.; Wu, K.; Guo, W.; Wu, Y. Cationic Copolymerization of Isobutylene with 4-Vinylbenzenecyclobutylene: Characteristics and Mechanisms. Polymers 2020, 12, 201.

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