The Generation of Biaxial Optical Anisotropies in Polyimide Films by an Uniaxial Stretch Method

概要

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A new biaxial-retardation film prepared from the uniaxial-stretched polyimide (PI) film was developed for compensating the viewing angle of liquid-crystal displays. A new aliphatic PI showing high transparence and low glass-transition temperature was firstly prepared for the biaxial-retardation film purpose. Both retardations in $x$–$y$ and $x$–$z$ planes of PI films were highly increased after stretching them uniaxially at 260 °C. Good uniformity of birefringence in well-stretched PI films was observed visually with two crossed polarizers. The birefringence variations of $\mathrm{n}x-\mathrm{n}y$ (difference of refractive indexes between $x$- and $y$-axes) and $\mathrm{n}x-\mathrm{n}z$ during the stretching process were highly affected by PI structure.
Japan Society of Applied Physicsの論文
2006-05-25