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(Referência obtida automaticamente do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A-βcyclodextrin/siloxane hybrid polymer: synthesis, characterization and inclusion complexes

Texto completo
Autor(es):
Camilla Abbehausen [1] ; André L. B. Formiga [2] ; Edvaldo Sabadini [3] ; Inez V. P. Yoshida [4]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Institute of Chemistry - Brasil
[2] Institute of Chemistry - Brasil
[3] Institute of Chemistry - Brasil
[4] Institute of Chemistry - Brasil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Chemical Society; v. 21, n. 10, p. 1867-1876, 2010-00-00.
Resumo

A hybrid polymer derived from siloxane and β-cyclodextrin (β-CD) was obtained by reaction of β-CD with g-isocyanatopropyltriethoxysilane (IPTS), followed by hydrolysis/condensation reactions, generating a β-CD-modified polysilsesquioxane resin (PSS-β-CD). PSS-β-CD hybrid was characterized by infrared spectroscopy and 13C and 29Si nuclear magnetic resonance. This hybrid was typically amorphous and thermally stable up to 180 ºC. PSS-β-CD was able to form films and its morphology was evaluated by scanning electron microscopy. The capability of β-CD grafted in the hybrid polymer to form inclusion complex was evaluated by the formation of a β-CD-phenolphthalein complex using UV-Vis spectroscopy. Even without changes in pH, the red form of phenolphthalein converts to the colorless one when PSS-β-CD is immersed in the solution. Theoretical calculations (AM1 and DFT methods) show that the complex is formed through the inclusion of the phenolate ring into β-CD cavity, favoring the colorless form of phenolphthalein by more than 15 kcal mol-1. (AU)

Processo FAPESP: 03/09926-1 - Materiais poliméricos e cerâmicos
Beneficiário:Inez Valeria Pagotto Yoshida
Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático