Data/hora: 17/05/2024 21:50:20

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 23/03/2005
Data da última atualização: | 27/01/2010
Autoria: | GRÓRIO JÚNIOR, R.; MALMONGE, L. F.; FERREIRA, G. F. L.; SANTOS, W. N.; MATTOSO, L. H. C.
Título: | Comportamento dielétrico de blendas PVDF/POMA com baixa porcentagem de poma dopada.
Ano de publicação: | 2003
Fonte/Imprenta: | In: CONGRESSO BRASILEIRO DE POLÍMEROS. 7., nov. 2003., Belo Horizonte, MG. Anais... São Carlos: Associação Brasileira de Polímeros, 2003. p. 55-56.
Idioma: | Português
Conteúdo: | The real and imaginary components of the complex pennittivity of blends of poly(vinylidene fluoride) (PVDF) with Poly(o-methoxyaniline) (POMA) doped with toluenosulfonic acid (TSA) containing 1,2.5 and 5wt% POMA-TSA were deternlined in the frequency interval between 100Hz and 3MHz and in the temperature range from -120 up to 120°C. lt was observed that the values of and have an enhanced increase with the content of POMA-TSA and temperature in the region of frequencies below 10kHz. This effect decreases with the frequency and it was attributed to the interfacial polarization, which is caused by the blend heterogeneity, which in turn is formed by conductive POMA-TSA agglomerates dispersed in an insulating matrix of PVDF. The equation of Maxwell-Garnett, modified by Cohen, has been used to evaluate conductivity behavior ofPOMA-TSA in the blends. lt was observed a strong decrease in the POMA-TSA conductivity in the blend, which is bigger the lower is the POMA-TSA content in the blend. This decrease should be caused either by the POMA dedoping during the process of the blend preparation or by its dispersion into the insulating matrix.
Palavras-Chave: | Blendas de polímeros convencionais; Filmes; Polímeros; POMA.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (8754-1) - UPC - SP - -- - PROCI-03.00099 -  - 2003.00099 - DIS