SciELO - Scientific Electronic Library Online

 
vol.20 número2Influência da Estrutura química do co-monômero nas propriedades mecânicas e adesivas de redes epoxídicasMultivariate Analysis of physicochemical parameters of the landfill São Giácomo in Caxias do Sul, RS in the degradation of polypropylene índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Polímeros

versão impressa ISSN 0104-1428

Resumo

SILVA, Rafael; CARVALHO, Gizilene M.; MUNIZ, Edvani C.  e  RUBIRA, Adley F.. Miscibility influence in the thermal stability and kinetic parameters of poly (3-hydroxybutyrate)/poly (ethylene terephthalate) sulphonated blends. Polímeros [online]. 2010, vol.20, n.2, pp.153-158.  Epub 11-Jun-2010. ISSN 0104-1428.  https://doi.org/10.1590/S0104-14282010005000023.

The thermal degradation of miscible and immiscible poly (3-hidroxy butyrate) PHB/ poly (ethylene terephthalate) sulphonated (PETs) blends was investigated using thermogravimetric analyses. Model-free kinetic analysis, Vyazovkin and Flynn-Wall-Ozawa's methods, were used to determine the apparent activation energy in the whole interval of degradation of the pure polymers, immiscible blends, and miscible blends. The thermal stability of both polymers in their blends is higher when compared to the pure polymers. The synergistic effect in the thermal stability in the blends is higher for the miscible blend where the formation of the specific interaction between PHB and PETs occurs. The apparent activation energy of the individual polymers is higher in PETs/PHB blends, and this effect is potentiated by the miscibility of the blend.

Palavras-chave : Biodegradable polymer; model-free kinetic analyses; polymeric blends; thermal degradation.

        · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons