3B06 洗浄処理による紫外光照射されたポリイミド膜の分子配向変化

概要

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We have investigated the change in molecular orientational distribution caused by a washing treatment in UV irradiated polyimide (poly [4,4'-oxydiphenylene-l,2,3,4-cyclobutanetetracarboximide]) films. The polyimide films were exposed to linearly polarized UV light (LPUVL) at different energy densities. The molecular orientation of the LPUVL-exposed films was determined by measuring the polarized IR absorption spectra. In the UV exposure range below 1.5 J/cm^2, the film anisotropy slightly increases by the washing treatment and beyond this exposure it decreases. This result shows that the contribution of the polymer fragments with low molecular weights to the film anisotropy increases with the LPUVL exposure above 1.5 J/cm^2. Thus the film anisotropy becomes maximum at 1.5 J/cm^2 for the washed film, while 〜3 J/cm^2 for the unwashed film.
日本液晶学会の論文
2001-09-24