화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.17, No.2, 121-127, February, 2009
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Investigation of Cure Kinetics and Storage Stability of the o-Cresol Novolac Epoxy Nanocomposites with Pre-intercalated Phenolic Hardeners
Tae Yong Hwang, Jae Wook Lee†, Sang Min Lee1, and Gi Joon Nam2
  • Applied Rheology Center, Dept. of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Korea
  • 1R&D Center, Kolon Industries, Inc., Incheon 404-250, Korea
  • 2R&D Center, LS Cable, Ltd., Gyeonggi 431-831, Korea
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The cure kinetics of the epoxy-layered, silicate nanocomposites were studied by differential scanning calorimetry under isothermal and dynamic conditions. The materials used in this study were o-cresol novolac epoxy resin and phenol novolac hardener, with organically modified layered silicates. Various kinetic parameters, including the reaction order, activation energy, and kinetic rate constants, were investigated, and the storage stability of the epoxy-layered silicate nanocomposites was measured. To synthesize the epoxy-layered silicate nanocomposites, the phenolic hardener underwent pre-intercalation by layered silicate. From the cure kinetics analyses, the organically modified layered silicate decreased the activation energy during cure reaction in the epoxy/phenolic hardener system. In addition, the storage stability of the nanocomposite with the pre-intercalated phenolic hardener was significantly increased compared to that of the nanocomposite with direct mixing of epoxy, phenolic hardener, and layered silicate. This was due to the protective effect of the reaction between onium ions and epoxide groups.
Keywords:cure kinetics;nanocomposites;layered silicates;o-cresol novolac epoxy;phenol novolac.
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