열잠재성 촉매 개시제를 이용한 에폭시 수지의 경화거동 및 열안정성
Cure Behaviors and Thermal Stabilities of Epoxy Resins Initiated by Latent Thermal Catalyst
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초록
본 연구에서는 열잠재성 양이온 촉매인 N-benzylpyrazinium hexafluoroantimonate (BPH)와 benzyl-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℃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.
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 (DGEBA) epoxy resins initiated by 1 wt.% of the catalysts were investigated by DSC, NIR, TGA, and DMA. Latent properties of the catalysts were examined by conversion of epoxy resins using NIR from 100℃ to 180℃. 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 DGEBA/BPH system. These could be attributed to the hindered structure of BDPH, resulting in decreasing the thermal stability in the DGEBA/BDPH system.
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