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Studies on the photodegradation of polarized UV-exposed PMDA-ODA polyimide films

机译:偏振紫外线暴露的PMDA-ODA聚酰亚胺薄膜的光降解研究

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摘要

Polarized Fourier transform infrared (FTIR) and ultra violet-visible (UV-VIS) spectroscopy were used to investigate the photodegradation direction of polarized UV (PUV)-irradiated polyimide (PI) films based on pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA). PI films strongly absorb below 350 nm, resulting in a photochemical reaction of the PI. PUV irradiation of the PI film caused a decrease of all existing peaks and formation of new peaks at 3258, 1748, and 1710 cm(-1) in the IR, due to degradation of the PI molecules. The preferential degradation of PI molecules parallel to the PUV irradiation direction results in the predominant orientation of the remaining PI molecules perpendicular to the PUV irradiation direction. But rubbing of the PI films induced orientation of the PI molecules parallel to the rubbing direction. (C) 2002 Wiley Periodicals, Inc. [References: 12]
机译:偏光傅立叶变换红外(FTIR)和紫外可见(UV-VIS)光谱用于研究偏苯四酸二酐(PMDA)和4,4'的偏光UV(PUV)辐照的聚酰亚胺(PI)薄膜的光降解方向-氧二苯胺(ODA)。 PI膜在350 nm以下强烈吸收,导致PI发生光化学反应。由于PI分子的降解,PI膜的PUV照射导致IR中3258、1748和1710 cm(-1)处所有现有峰的减少和新峰的形成。平行于PUV照射方向的PI分子的优先降解导致其余的PI分子垂直于PUV照射方向的主要取向。但是PI膜的摩擦引起PI分子平行于摩擦方向的取向。 (C)2002 Wiley Periodicals,Inc. [参考:12]

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