Cure Behaviors and Mechanical Interfacial Properties of Epoxy/Polyurethane Blends Initiated by Latent Thermal Catalyst

열잠재성 개시제에 의한 에폭시/폴리우레탄 블렌드의 경화거동 및 파괴인성

  • Park, Soo-Jin (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Seok, Su-Ja (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Kang, Jun-Gil (Department of Chemistry, Chungbuk National University) ;
  • Kwon, Soo-Han (Department of Chemistry, Chungbuk National University)
  • 박수진 (한국화학연구원 화학소재연구부) ;
  • 석수자 (한국화학연구원 화학소재연구부) ;
  • 강준길 (충북대학교 화학과) ;
  • 권수한 (충북대학교 화학과)
  • Published : 2004.03.31

Abstract

In this work, the diglycidylether of bisphenol A (DGEBA) and modified polyurethane (PU) blends were initiated by N-benzylpyrazinium hexafluoroantimonate (BPH). The cure and fracture toughness of neat DGEBA with the addition of PU were investigated. The cure properties of DGEBA/PU blend system were examined by DSC and near-IR measurements. The fracture touhtness were investigated by measuring the critical stress intensity factor ($K_{IC}$) and the critical strain energy release rate ($G_{IC}$). According to the results, the maximum values of owe activation energy ($E_a$) and conversion (${\alpha}$) were found at 10 phr of PU. Also the $K_{IC}$ showed a similar behavior with the results of conversion. These results were probably due to increase of crosslinking density in the blends resulted from increase of the hydrogen bonding between the hydroxyl groups of DGEBA and isocyanate groups of PU.

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