Temperature dependence of photoinduced birefringence in polystyrene doped with Disperse Red-1
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Data
2002-11-25
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Resumo
A theoretical model on the basis of the free-volume concept is presented explaining the temperature dependence of photoinduced birefringence in polystyrene films that contain Disperse Red-1. Birefringence increases with temperature up to 180 K as the free volume for isomerization increases, and then decreases as thermally activated processes dominate. The fast process of birefringence decay has a time constant that increases with temperature at low temperatures, due to the change in photoisomerization.
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Disperse Red-1, Free volume, Isomer/isomerization, Photoinduced birefringence, Polystyrene
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Macromolecular Rapid Communications, v. 23, n. 16, p. 948-951, 2002.