Abstract
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 Δn(450)/Δn(550) of the PPO/PS blends containing 25.6 wt% PPO decreases with increasing temperature between Tg and Tg+15°C at a draw ratio of 3, while it increases above Tg+15°C. The normalized birefringence dispersion as a function of draw ratio at Tg+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.
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