Effect of monomer feeding mode on the preparation of hollow latexes with high MAA content in the core latex preparation

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• 作者：Yi-ming Jiang (1)
  Bo-tian Li (1)
  Wei Deng (2)
  Xue-yan Li (2)
  Cheng-you Kan ???/a> (1)
  
• 关键词：Emulsion polymerization ; Hollow morphology ; Methacrylic acid ; Monomer feeding mode
• 刊名：Chinese Journal of Polymer Science
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：32
• 期：1
• 页码：21-28
• 全文大小：
• 作者单位：Yi-ming Jiang (1)
  Bo-tian Li (1)
  Wei Deng (2)
  Xue-yan Li (2)
  Cheng-you Kan ???/a> (1)
  
  1. Department of Chemical Engineering and Key Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing, 100084, China
  2. Beijing Eastern Acrylic Chemical Technology Co. Ltd., Beijing, 101149, China
  
• ISSN：1439-6203

文摘

In order to prepare hollow latex particles with optimum morphology based on osmotic swelling principle, threelayer core/shell latex particles with 40 wt% MAA in the core were first prepared via multistep seeded emulsion copolymerization, in which monomers were added by a semi-continuous process with monomer addition under two different forms: pure monomers?mixture (monomer addition), and pre-emulsified monomers (pre-emulsion addition). Then, the hollow latex particles with different morphologies were obtained after alkali post-treatment. Influences of the monomer feeding mode on the emulsion polymerization and the particle morphology were investigated. Results showed that the preemulsion addition could significantly improve the polymerization stability in each step, and greatly enhance the uniformity of shell encapsulation. The sizes of the core and core/shell latex particles obtained by the pre-emulsion addition were smaller and more uniform than those synthesized by the monomer addition, and the hollow latex particles with intact morphology were generated by alkali post-treating of the core/shell latexes prepared from the pre-emulsion addition. As the core size increased, the morphology of the post-treated particles underwent evolution from hollow to collapse. Moreover, the mechanism of the particle morphological evolution was proposed.