Curing kinetics of pre-crosslinked carboxyl-terminated butadiene acrylonitrile (CTBN) modified epoxy blends

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• 作者：Xiaoxue Song ; Shiai Xu
• 关键词：Epoxy resins ; Pre ; crosslinked liquid rubber ; Curing kinetics ; DSC
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：123
• 期：1
• 页码：319-327
• 全文大小：1,181 KB
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• 作者单位：Xiaoxue Song (1)
  Shiai Xu (1) (2)
  
  1. Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China
  2. The Chemical Engineering College of Qinghai University, Xining, 810016, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

The purpose of this study is to investigate the curing kinetics of neat and pre-crosslinked or non-crosslinked carboxyl-terminated butadiene acrylonitrile liquid rubber (CTBN) toughened epoxies cured with isophorone diamine (IPDA) using non-isothermal and isothermal differential scanning calorimetry. The results show that CTBN has a complex effect on the curing process of epoxy/IPDA systems. The carboxyl groups of CTBN can accelerate the curing reactions, while the phase-separated CTBN particles and the dilution of curing ingredients caused by CTBN addition can hinder the curing reactions, resulting in an increase in activation energy. Interestingly, the activation energy of pre-crosslinked CTBN/epoxy systems decreases compared to their non-crosslinked counterparts because of the enhanced curing effect of the benzoic acid produced by benzoyl peroxide (BPO). An autocatalytic Kamal’s model is successfully used to describe the curing process of epoxy systems studied.