Control of Birefringence Dispersion of Uniaxially Oriented Poly(2,6-dimethyl 1,4-phenylene oxide)/Atactic Polystyrene Blend Films by Changing the Stretching Parameters

概要

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The birefringence dispersion of uniaxially oriented poly(2,6-dimethyl 1,4-phenylene oxide) (PPO)/atactic polystyrene (PS) blend films has been examined as a function of stretching temperature and draw ratio by polarization-modulated transmission spectro-ellipsometry. The normalized dispersion of $\Delta n(450)/\Delta n(550)$ of the PPO/PS blends containing 25.6 wt% PPO decreases with increasing temperature between $T_{\text{g}}$ and $T_{\text{g}}+15$°C at a draw ratio of 3, while it increases above $T_{\text{g}}+15$°C. The normalized birefringence dispersion as a function of draw ratio at $T_{\text{g}}+15$°C diverges at a draw ratio between 1.7 and 1.8. These phenomena can be explained by the change of the PS and PPO orientation functions in the birefringence equation of a multicomponent system on the assumptions that the intrinsic birefringence of PS and PPO is not changed by blending and the form birefringence is ignored.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-09-15