Dall'Agnol, F.Silva, JRZilio, S. C.Oliveira, O. N.Giacometti, J. A.2014-05-202014-05-202002-11-25Macromolecular Rapid Communications. Weinheim: Wiley-v C H Verlag Gmbh, v. 23, n. 16, p. 948-951, 2002.1022-1336http://hdl.handle.net/11449/32614A 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 kin photoisomerization.948-951engDisperse Red-1free volumeisomer/isomerizationphotoinduced birefringencepolystyreneArtigo10.1002/1521-3927(200211)23:16<948WOS:000180055500002Acesso restrito