Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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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
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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.

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.

Keywords

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