| Search / Korean Journal of Chemical Engineering |
HWAHAK KONGHAK,
Vol.38, No.2, 249-254, 2000
Vol.38, No.2, 249-254, 2000
사슬 강직도에 따른 폴리이미드 박막의 수분 흡수 거동
Water Sorption Behaviors in the Polyimide Thin Films with Various Chain Rigidities
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
[References]
- Bessonov MI, Zubkov VA, "Polyamic Acids and Polyimides; Synthesis, Transformations, and Structure," CRC Press, 1993
- Ghosh MK, Mittal KL, "Polyimides; Fundamentals and Applications," Marcel Dekker, Inc., 1996
- Mittal KL, "Polyimides; Synthesis, Characterization, and Applications," Plenum Press, New York, 1984
- Bellucci F, Khamis I, Senturia SD, Latanision RM, J. Electrochem. Soc., 137, 1778, 1990
- Melcher J, Daben Y, Arlt G, IEEE Trans. Elect. Ins., 24, 31, 1989
- Ree M, Han H, Gryte CC, High Perform. Polym., 6, 321, 1994
- Han H, Gryte CC, Ree M, Polymer, 36(8), 1663, 1995
- Han H, Seo J, Ree M, Pyo SM, Gryte CC, Polymer, 39(13), 2963, 1998
- Seo J, Kim S, Chung H, Joe Y, Han H, Polym. J., 31, 127, 1999
- Ree M, Han H, Gryte CC, J. Polym. Sci. B: Polym. Phys., 33(3), 505, 1995
- Crank J, "The Mathematics of Diffusion," Clarendon Press, Oxford, 1976
- Crank J, Park GS, "Diffusion in Polymers," Academic Press, London, 1968
- Isoda I, Shimada H, Kochi M, Kambe H, J. Polym. Sci. B: Polym. Phys., 19, 1293, 1981
- Russell TP, Polym. Eng. Sci., 24, 345, 1984
- Russell TP, J. Polym. Sci. B: Polym. Phys., 22, 1105, 1984
- Crank J, "The Mathematics of Diffusion," Clarendon Press, Oxford, 1976
- Crank J, Park SG, "Diffusion in Polymers," Academic Press, London, 1968
- van Krevelen DW, "Properties of Polymers," 3rd Ed., Elseviers Science Publishing Company Inc., Amsterdam, 1990
- Lokhandwala KA, Nadakatti SM, Stern SA, J. Polym. Sci. B: Polym. Phys., 33(6), 965, 1995
- Okamoto KI, Tanihara N, Watanabe H, Tanaka K, Kita H, Nakamura A, Kusuki Y, Nakagawa K, J. Polym. Sci. B: Polym. Phys., 30, 1223, 1992
- Cullity BD, "Elements of X-ray Diffraction," 2nd Ed., Addison-Wesley Publishing Company Inc., London, 1977
- Seo J, Han H, J. Polym. Sci. B: Polym. Phys., (in Preparation)
- Numata S, Fujisaki K, Kinjo N, Polymer, 28, 2282, 1987
- Privalko VP, Pedosenko AV, Polym. Eng. Sci., 37(6), 978, 1997
- West RC, "CRC Handbook of Chemistry and Physics," 66th ed., B68-161, Cleveland, 1989
참고문헌정보(참고문헌, 인용문헌)는 화학공학소재연구정보센터에 의해 제공되고 있습니다.