Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Cure Behaviors and Thermal Stabilities of Epoxy Resins Initiated by Latent Thermal Catalyst

열잠재성 촉매 개시제를 이용한 에폭시 수지의 경화거동 및 열안정성

  • 박수진 (한국화학연구원 화학소재연구부) ;
  • 석수자 (한국화학연구원 화학소재연구부) ;
  • 이재락 (한국화학연구원 화학소재연구부) ;
  • 김영근 (케이피아이)
  • Published : 2004.10.01
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Abstract

In this work, two thermal latent catalysts, i.e., N-benzylpyrazinium hexafluoroantimonate (BPH) and benzyl-2,5-dimethylpyrazinium hexafluoroantimonate (BDPH), were synthesized. The cure behaviors and thermal stabilities of diglycidylether of bisphenol A (DCEBA) epoxy resins initiated by 1 wt.% of the catalysts were investigated by DSC, NIR, TCA, and DMA Latent properties of the catalysts were examined by conversion of epoxy resins using NIR from $100^{\circ}C$ to $180^{\circ}C$ From the resultes of near-IR, DGEBA/BPH system showed higher conversion than that of DGEBA/BDPH system. The thermal stabilities of DGEBA/BDPH system based on the initial decomposition temperature (IDT) and integral procedural decomposition (IPDT) were relatively lower than those of DCEBA/BPH system. These could be attributed to the hindered structure of BDPH, resulting in decreasing the thermal stability in the DGEBA/BDPH system.

본 연구에서는 열잠재성 양이온 촉매인 N-benzylpyrazinium hexafluoroantimonate (BPH)와 benryl-2,5-dimethylpyrazinium hexafluoroantimonate (BDPH)를 합성하였고, 이관능성 에폭시 수지(diglycidylether of bisphenol A, DGEBA)에 개시제로 1 wt.%의 촉매를 혼합하여 DSC, NIR TGA 그리고 DMA를 이용하여 경화거동과 열안정성을 알아보았다. 촉매의 잠재특성은 $100∼180^{\circ}$의 반응 온도에 따른 전환율을 near-IR로부터 조사하였다. NIR 분석으로부터, BPH에 의한 에폭시 수지의 전환율은 BDPH와 비교하여 높은 전환율을 나타내는 것을 확인할 수 있었다. 그리고 TGA 분석 결과, 초기 열분해 온도(IDT)와 적분 열분해 온도(IPDT)에 입각하여 DGEBA/BDPH 시스템의 열안정성이 DGEBA/BPH 시스템보다 상대적으로 낮은 값을 나타냈다. 이는 BDPH 구조의 입체 장애로 인해 BPH보다 열안정성 인자이 더 낮게 측정된 것으로 판단된다.

Keywords

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