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The rheooptical properties of polymer blends: Polystyrene and poly(2,6‐dimethyl‐1,4‐phenylene oxide)
Author(s) -
Greener J.,
Machell J. S.
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070400118
Subject(s) - materials science , polystyrene , glass transition , flow birefringence , phenylene , polymer chemistry , polymer , rheometer , composite material , birefringence , optics , rheology , physics
The stress‐optical coefficients (SOCs) of miscible polystyrene (PS)/poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PRO) blends were measured in the melt state over a wide range of compositions. The flow birefringence measurements were performed with a slit die rheometer using a simplified procedure which eliminates the need to specify the distribution of extinction angles in the flow space. The SOC of the PS/PPO system at ∼ T g + 110°C follows a linear blending law and full optical compensation (SOC = 0) is observed at ∼61 wt% PS. This value is lower by ∼10% relative to values obtained by film stretching techniques. Measurements of SOC in the glassy state also yield linear dependence of SOC on composition but no compensation is obtained in this case because of the sign reversal in the SOC of PS in the glass transition range.