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Synthesis and Curing Behavior of Crystalline Biphenyl Epoxy Resin

결정성 바이페닐 에폭시 합성 및 경화 거동 연구

  • Choi, Bong-Goo (Department of Chemical Engineering, Kwangwoon University) ;
  • Choi, Ho-Kyoung (Department of Chemical Engineering, Kwangwoon University) ;
  • Choi, Jae-Hyun (Department of Chemical Engineering, Kwangwoon University) ;
  • Choi, Joong-So (Department of Chemical Engineering, Kwangwoon University)
  • 최봉구 (광운대학교 화학공학과) ;
  • 최호경 (광운대학교 화학공학과) ;
  • 최재현 (광운대학교 화학공학과) ;
  • 최중소 (광운대학교 화학공학과)

Abstract

The basic catalyst 1-benzyl-3-methyl-imidazolium hexafluoroantimonate (BMH) was synthesized and analyzed by FT-IR and $^1H-NMR$. A crystalized biphenyl-based epoxy was synthesized by using tetramethyl biphenol (TMBP) and epichlorohdrine. In order to consider the curing tendency of the synthesized BMH, the mass ratio was changed to 0.5, 1.0, 2.0 wt.% under heated conditions and the curing tendency was analyzed by differential scanning calorimeter (DSC). As a result, the BMH catalyst showed a fast curing result in the stepwise heating process of the biphenol-A epoxy and the cationic polymer. From these results, the BMH catalyst showed excellent thermal stability as a potential heat curing catalyst. In addition, we considered the application possibility of epoxy molding compound (EMC) which required a skeleton structure and a high heat resistance because the synthesized biphenyl epoxy had a characteristic of rapidly lowering viscosity at a constant temperature and a rigid skeleton structure of biphenol. As a result, it was confirmed that the TMBP-based epoxy developed in this study was composed of a crystalline structure, and a curing reaction was observed with a Novolac resin at a high temperature. In the presence of a catalyst, a curing reaction was observed around $150^{\circ}C$ and thus TMBP-based epoxy was successfully applied as a raw material of EMC.