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사슬 강직도에 따른 폴리이미드 박막의 수분 흡수 거동
Water Sorption Behaviors in the Polyimide Thin Films with Various Chain Rigidities
연세대학교 공과대학 화학공학과, 서울 120-749
Department of Chemical Engineering, Yonsei University, 134 Shinchon-Dong,Seodaemun-Gu, Seoul 120-749, Korea
HWAHAK KONGHAK, April 2000, 38(2), 249-254(6), NONE
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Abstract
폴리이미드 박막의 상대습도에 따른 수분 확산 거동을 Thin Film Diffusion Analyzer를 이용하여, 서로 다른 사슬 강직도를 가지는 네 가지 구조에 대하여 측정하였다. rigid poly(1,4-phenylene pyromellitimide(PMDA-PDA), semi-rigid poly(1,4-phenylene biphenyltetracarboximide(BPDA-PDA), semi-flexible poly(,4''-oxydiphenylene pyromellitimide(PMDA-ODA), flexible poly(4,4''-oxydiphenylene benzophenone tetracarboximide(BTDA-ODA). 또한 X-선 회절 측정을 통한 박막의 형태학적 특성 (morphology)과 유리전이온도를 이용하여 분석하였다. 박막 내로의 수분확산 거동은 박막의 불균일성과 상대습도 차이에도 불구하고 Fickian 확산 모델에 잘 부합되었다. 상대습도의 변화에도 불구하고 확산계수는 일정하였으나, 상대습도가 증가함에 따라 확산되는 수분의 양은 폴리이미드의 구조와 관계없이 선형적으로 증가하였다. 또한 주쇄 구조에 따른 확산 계수는 BPDA-PDA
Water sorption behavior was gravimetrically investigated as a function of relative humidity and chemical structure for four polymide thin films with various chain rigidities: rigid poly(1,4-phenylene pyromellitimide(PMDA-PDA), semi-rigid poly(1,4-phenylene biphenyltetracarboximide(BPDA-PDA), semi-flexible poly(,4''-oxydiphenylene pyromellitimide(PMDA-ODA), flexible poly(4,4''-oxydiphenylene benzophenone tetracarboximide(BTDA-ODA). In addition, the morphological structure of the films was characterized by x-ray diffraction together with glass transition temperature. The water sorption isotherms for the polyimide films were reasonably well fitted by Fickian diffusion model, regardless of morphological heterogeneities and relative humidity. The diffusion coefficient varied little but the water uptake increased with increasing humidity. The diffusion coefficient for different type polyimide thin films was in the increasing order: BPDA-PDA
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