열잠재성 개시제에 의한 에폭시/폴리우레탄 블렌드의 경화거동 및 파괴인성

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

  • 박수진 (한국화학연구원 화학소재연구부) ;
  • 석수자 (한국화학연구원 화학소재연구부) ;
  • 강준길 (충북대학교 화학과) ;
  • 권수한 (충북대학교 화학과)
  • 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)
  • 발행 : 2004.03.31

초록

본 연구는 열잠재성 개시제인 N-benzylpyrazinium hexafluoroantimonate (BPH)로 개시되어진 이관능성 에폭시인 diglycidylether of bisphenol A (DGEBA)와 변성 polyurethane (PU) 블렌드의 PU의 함량에 따른 경화거동과 파괴인성을 연구하였다. 블렌드의 경화거동은 시차주사 열량계(DSC)와 near-IR 을 통해 관찰하였고, 파괴인성은 임계응력 세기인자($K_{IC}$)와 임계 변형에너지 방출속도($G_{IC}$)를 측정하였다. 실험 결과, 경화 활성화에너지($E_a$)와 전환율(${\alpha}$)은 PU의 함량이 10 phr에서 최고값을 나타냈으며, $K_{IC}$는 전환율과 유사한 경향을 나타냄을 확인하였다. 이는 PU의 이소시아네이트기와 DGEBA의 하이드록실기 사이의 수소 결합이 증가함에 따라 블렌드의 가교밀도가 증가했기 때문으로 판단되어 진다.

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