SciELO - Scientific Electronic Library Online

 
vol.17 número3Substituição de amianto por silicato de alumínio e grafite expansível em compósito de poliuretano utilizado em motor-fogueteUso da cinza da casca de arroz como carga em matrizes de poliamida 6 e poliamida 6.6 índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

PACHECO, Marcos F. M. et al. Effect of rigid segment content on the physical, mechanical, chemical and morphological properties of microcellular polyurethane elastomers. Polímeros [online]. 2007, vol.17, n.3, pp.234-239. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282007000300013.

In this study, three different microcellular polyurethane elastomers (MPUE) based on 4,4'-diphenylmethane diisocyanate (MDI) with different rigid segment contents were prepared (Formulations 1, 2 and 3 with 32, 35 and 42% of rigid segment content, respectively). The MPUE were obtained through a two-step method using the prepolymer system. The samples were analyzed to determine their physical, mechanical, morphological and chemical properties. The results showed that a greater rigid segment content gave higher tensile, compressive and tear strength values. The deformation at break did not show significant changes with a variation in the rigid segment content. The MPUE had a low swelling index in common industrial solvents. However, in acetone a high swelling index was observed. The SEM micrographs indicated a large number of closed cells, and that a higher rigid segment content gave a better cell homogeneity of the samples.

Palavras-chave : Microcellular polyurethane elastomers; mechanical properties; scanning electron microscopy.

        · resumo em Português     · texto em Português     · Português ( pdf )

 

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