Mechanism of in Situ Compatibilization and Degradation by Friedel-Crafts Alkylation Reaction for Polymer Blends

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (9): 1898.

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Mechanism of in Situ Compatibilization and Degradation by Friedel-Crafts Alkylation Reaction for Polymer Blends

GUO Zheng-Hong^1*, FANG Zheng-Ping^1,2

1. Department of Biochemical and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;
2. Institute of Polymer Composites, Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027, China

Received:2008-11-18 Online:2009-09-10 Published:2009-09-10
Contact: GUO Zheng-Hong. E-mail: guozhenghong@nit.zju.edu.cn
Supported by:
宁波市自然科学基金(批准号： 2008A610057)资助.

Abstract

Abstract:

The Friedel-Crafts alkylation reaction is common in organic synthesis. However, only a few articles on the Friedel-Crafts alkylation reaction for in situ compatibilization of PS and polyolefin blends have been published so far. The mechanism of Friedel-Crafts alkylation reaction adopted in PS/polyolefin blends keeps unclear, and the concerned study is not sufficient. GPC analysis for PS/POE blends showed that the effects of AlCl3 catalyst laid on in situ compatibilization and degradation. On the basis of detailed analysis on the characteristics of Friedel-Crafts alkylation reaction and the deeply understanding of the mechanism of in situ compatibilization for PS/POE/AlCl₃ blends, it was found that there was the competition of two factors: the formation of PS-g-POE copolymer and the degradation of the blending components. In the presence of AlCl₃ catalyst, there were lots of carbocation appeared in PS/POE/AlCl₃ blends. The carbocation attacked polyolefin and caused the chain scission through electron rearrangement, which resulted in the degradation of the blending components.

Key words: In situ compatibilization, Friedel-Crafts alkylation reaction, PS-g-POE copolymer, Degradation

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GUO Zheng-Hong*, FANG Zheng-Ping. Mechanism of in Situ Compatibilization and Degradation by Friedel-Crafts Alkylation Reaction for Polymer Blends[J]. Chem. J. Chinese Universities, 2009, 30(9): 1898.

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Mechanism of in Situ Compatibilization and Degradation by Friedel-Crafts Alkylation Reaction for Polymer Blends

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