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Monolayers and Thin Films of Dextran Hydrophobically Modified

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2010
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Leiva, Angel
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Monolayers and Thin Films of Dextran Hydrophobically Modified
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Author
  • Leiva, Angel;
  • Muñoz, Natalia;
  • Urzúa Acevedo, Marcela;
  • Gargallo, Ligia;
  • Radic, Deodato;
Abstract
Foram sintetizados uma série de copolímeros enxertados biodegradáveis pelo enxerto da e-captolactona sobre dextrana de diferentes pesos moleculares. Os polímeros obtidos foram caracterizados por infravermelho com transformada de Fourier, ressonãncia magnética nuclear, termogravimetria e análise elementar. Monocamadas estáveis na interface ar-água e filmes finos de revestimento por rotação foram preparados e caracterizados pela técnica de Langmuir e por medidas de angulo de contato. A compressibilidade e elasticidade estática superficial das monocamadas e a energia de superfície dos copolimeros de filme finos mostram dependência com a quantidade de e-caprolactona. Desses resultados pode-se concluir que as propriedades de superfície de polímeros enxertados podem ser moduladas pela sua composição. Adicionalmente, de acordo com esses resultados, dextranas enxertadas com e-caprolactona mostram potencial para serem usadas em diferentes aplicações onde as propriedades de superfície são importantes. A series of biodegradable graft copolymers were synthesized by grafting e-caprolactone over dextran of different molecular weights. The obtained copolymers were characterized by Fourier transform infrared spectroscopy FTIR, proton nuclear magnetic resonance 1H NMR, thermogravimetry and elemental analysis. Stable monolayers at the air-water interface and spin coated thin films were prepared and characterized by the Langmuir technique and by contact angle measurements respectively. The compressibility and static surface elasticity of the monolayers and the surface energy of copolymer thin films show dependence with the e-caprolactone content. From these results it can be concluded that the surface properties of grafted copolymers can be modulated by their composition. Additionally, according to the obtained results, e-caprolactone grafted-dextrans show potential for being used in different applications where surface properties are important.
Patrocinador
The authors acknowledge Fondecyt grants, Chile (1080238 and 1040550) for the partial financial support for this work.
Identifier
URI: https://repositorio.uchile.cl/handle/2250/119049
ISSN: 0103 - 5053
Quote Item
J. Braz. Chem. Soc., Vol. 21, No. 1, 78-86, 2010.
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