SciELO - Scientific Electronic Library Online

 
vol.21 número4Polímeros sintéticos biodegradáveis: matérias-primas e métodos de produção de micropartículas para uso em drug delivery e liberação controladaAvaliação do bis(4-metilfenilditiocarbimato)zincato(II) de tetrabutilamônio como acelerador no processo de vulcanização do elastômero polibutadieno 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

VALERO, Manuel F. et al. Physico-mechanical, thermal and morphological Behaviour of simultaneous interpenetrating polymer networks based on polyurethane from modified castor oiland starch/poly(Methyl Methacrylate). Polímeros [online]. 2011, vol.21, n.4, pp.293-298.  Epub 14-Out-2011. ISSN 0104-1428.  https://doi.org/10.1590/S0104-14282011005000050.

Castor oil was modified by transesterification with pentaerithritol. In a parallel step, starch was divided into monosaccharide units by glycosylation in order to obtain products with high hydroxyl content. The values of hydroxyl index were measured according to the content of pentaerithritol and starch used in the synthesis. Novel simultaneous interpenetrating polymer networks (SINs) of polyurethane (PU) and poly(methyl methacrylate) (PMMA) in different weight ratios of 100/0, 90/10, 80/20, 70/30, 60/40 and 50/50 were prepared based on polyol-glucosides. The polyurethane network was created by reacting the poliol-glucosides with isophorone diisocyanate maintaining a molar ratio NCO/OH = 1. The PMMA network was synthesized using benzoyl peroxide as initiator and ethylene glycol dimethacrylate as the crosslinker. The SINs were characterized in their mechanical properties, such as Shore A hardness, tensile strength and elongation at break. Thermal stability of SINs was measured using thermogravimetric analysis (TGA). Surface morphology measured using scanning electron microscope (SEM) showed two-phase morphology for all the SINs. SINs based on polyurethane from castor oil modified and poly(methyl methacrylate) show limited compatibility at low concentrations of PMMA, but are totally incompatible at higher concentrations of PMMA.

Palavras-chave : Castor oil; starch; glycosylation; SINs; poly(methyl methacrylate) (PMMA).

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

 

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