Portal de Periódicos da CAPES

Influence of aging and crystallinity on the molecular motions in bisphenol-A polycarbonate

1996; Wiley; Volume: 34; Issue: 17 Linguagem: Inglês

10.1002/(sici)1099-0488(199612)34

1099-0488

E. Laredo, M. Grimau, Alejandro J. Müller, A. Bello, N. Suárez,

Material Properties and Processing

Journal of Polymer Science Part B: Polymer PhysicsVolume 34, Issue 17 p. 2863-2879 Article Influence of aging and crystallinity on the molecular motions in bisphenol-A polycarbonate E. Laredo, Corresponding Author E. Laredo Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaPhysics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorM. Grimau, M. Grimau Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorA. Müller, A. Müller Materials Science Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorA. Bello, A. Bello Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorN. Suarez, N. Suarez Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this author E. Laredo, Corresponding Author E. Laredo Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaPhysics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorM. Grimau, M. Grimau Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorA. Müller, A. Müller Materials Science Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorA. Bello, A. Bello Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this authorN. Suarez, N. Suarez Physics Department, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaSearch for more papers by this author First published: December 1996 https://doi.org/10.1002/(SICI)1099-0488(199612)34:17 3.0.CO;2-SCitations: 49AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Thermally Stimulated Depolarization Current technique, Differential Scanning Calorimetry, and Dynamic Mechanical Analysis have been applied to amorphous and semicrystalline bisphenol-A polycarbonate with crystallinity degrees up to 21.8%, in a temperature interval covering the α and β relaxations. The secondary β transition is found to be the sum of three components whose variations in aged and annealed specimens have shown the cooperative character of the β1 and β2 modes, contrary to the localized nature of the β3 component. A Tg decrease was observed by both TSDC and DSC as a function of Xc and has been related to the possible confinement of the mobile amorphous phase in regions whose sizes are smaller than the correlation lengths of the cooperative movements that characterize the motions occurring at Tg. The α relaxation intensity variations with crystallinity show the existence of an abundant rigid amorphous phase in the semicrystalline material. The relaxation parameters deduced from the Direct Signal Analysis of the α relaxation for the mobile amorphous phase do not show significant deviations from those found for the amorphous material. The existence of the rigid amorphous phase has been associated to the ductile-to-brittle transition experienced by the material at low crystallinity levels. © 1996 John Wiley & Sons, Inc. Citing Literature Volume34, Issue17December 1996Pages 2863-2879 RelatedInformation