Dall'Agnol, FernandoSilva, Josmary R.Zílio, Sérgio C.Oliveira Jr., Osvaldo N.Giacometti, José A. [UNESP]2022-04-292022-04-292002-11-25Macromolecular Rapid Communications, v. 23, n. 16, p. 948-951, 2002.1022-1336http://hdl.handle.net/11449/231708A 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.948-951engDisperse Red-1Free volumeIsomer/isomerizationPhotoinduced birefringencePolystyreneTemperature dependence of photoinduced birefringence in polystyrene doped with Disperse Red-1Artigo10.1002/1521-3927(200211)23:16<9482-s2.0-0037176002