Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/3521
Título: | Chain reorientation in ß-PVDF films upon transverse mechanical deformation studied by SEM and dielectric relaxation |
Autor(es): | Barbosa, R. Mendes, J. A. Sencadas, Vítor João Gomes Silva Mano, J. F. Lanceros-Méndez, S. |
Palavras-chave: | PVDF SEM Dielectric relaxation Mechanical deformation |
Data: | 2003 |
Editora: | Taylor & Francis |
Revista: | Ferroelectrics |
Citação: | "Ferroelectrics". ISSN 0015-0193. 294 (2003) 78-83. |
Resumo(s): | Chain reorientation may be induced in polyvinylidene fluoride (PVDF) in its ß-phase by applying a deformation perpendicular to the pre-oriented polymeric chains. This reorientation begins right after the yielding point and seems to be completed when the stress-strain curve stabilizes. We have studied the chain reorientation mechanism by scanning electron microscopy (SEM) and dielectric relaxation methods and we have analyzed its influence in the alpha- and ß-relaxations of the polymer. SEM images confirm the existence of a reorientation upon transversal deformation. The decrease of crystallinity with increasing reorientation and the dependence of the dielectric permittivity upon deformation indicate that a model of stress-induced melting followed by an incomplete recrystallization properly describes the reorientation mechanism. |
Tipo: | Artigo em ata de conferência |
URI: | https://hdl.handle.net/1822/3521 |
DOI: | 10.1080/00150190390238630 |
ISSN: | 0015-0193 |
Versão da editora: | http://www.tandf.co.uk/journals/online/0015-0193.asp |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - FCD - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
vsencadas7.pdf | 132,11 kB | Adobe PDF | Ver/Abrir |