Novel cross-linking mechanism for producing PAA microgels synthesized by precipitation polymerization method

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• 作者：M. Kohestanian ; H. Bouhendi
• 关键词：Ethylene glycol diglycidyl ether (EGDGE) ; Cross ; linker ; Microgels ; Poly(acrylic acid) ; Precipitation polymerization
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：293
• 期：7
• 页码：1983-1995
• 全文大小：2,453 KB
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• 作者单位：M. Kohestanian (1)
  H. Bouhendi (1)
  
  1. Iran Polymer and Petrochemical Institute (IPPI), P.O. Box ?15, Tehran, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

A series of new cross-linkers, ethylene glycol diglycidyl ether (EGDGE), with new cross-linking mechanism, was utilized to prepare cross-linked poly(acrylic acid) microgels by precipitation polymerization method. All of the epoxy rings do not react with –COOH groups of PAA chains during polymerization stage; therefore, the unreacted epoxy rings would be reacted after polymerization stage (during sample drying time), which was named as “post curing stage.-The effect of cross-linker concentration, time, and temperature of post curing stage on the samples behaviors (i.e., swelling capacity, gel content, glass transition temperature, and rheological properties) were investigated. A new relationship between gelation rate in the post curing stage and epoxy content was defined. Also a relationship between average molecular weight of two successive cross-links (Mc), epoxy concentration ([epoxy]), and temperature of post curing stage (T pc ) was suggested. The microgel properties such as the rotational viscosity and rheological properties (that was synthesized by this novel cross-linking method) were compared to that of microgels that were synthesized by divinyl-type cross-linkers (trimethylol propane triacrylate (TMPTA)). The results show that the microgel properties which were synthesized by novel cross-linking mechanism are better than that of microgel properties by conventional cross-linking method.