高等学校化学学报

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (9): 1898.

• 研究论文 • 上一篇    下一篇

高分子共混物中Friedel-Crafts烷基化反应原位增容与催化降解机理

郭正虹1, 方征平1,2   

  1. 1. 浙江大学宁波理工学院, 高分子材料与工程研究所, 宁波 315100;
    2. 浙江大学高分子复合材料研究所, 教育部高分子合成与功能化重点实验室, 杭州 310027
  • 收稿日期:2008-11-18 出版日期:2009-09-10 发布日期:2009-09-10
  • 通讯作者: 郭正虹， 女， 博士， 讲师, 主要从事高分子材料聚合物共混改性研究. E-mail: guozhenghong@nit.zju.edu.cn
  • 基金资助:

    宁波市自然科学基金(批准号： 2008A610057)资助.

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

GUO Zheng-Hong1*, FANG Zheng-Ping1,2   

  1. 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.

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摘要：

采用GPC方法对共混组分的分子量、接枝率和降解度等数据进行分析, 发现AlCl3催化剂对PS/POE共混物的作用表现在原位增容和催化降解两个方面. 结合Friedel-Crafts烷基化反应的特点细化反应过程, 发现PS/POE共混物在AlCl3作用下发生接枝反应时, 有大量碳正离子出现, 而碳正离子周围的电子重排会导致分子链断裂, 从而引起共混组分出现大幅度降解. PS/POE/AlCl3共混物中原位接枝与催化降解是一对竞争性反应, 同时存在, 并相互竞争.

关键词: 原位增容, Friedel-Crafts烷基化反应, PS-g-POE接枝共聚物, 催化降解

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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