| Full text | |
| Author(s): |
Abbehausen, Camilla
[1]
;
Formiga, Andre L. B.
[1]
;
Sabadini, Edvaldo
[1]
;
Yoshida, Inez V. P.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Journal of the Brazilian Chemical Society; v. 21, n. 10, p. 1867-1876, 2010. |
| Web of Science Citations: | 10 |
| Abstract | |
A hybrid polymer derived from siloxane and beta-cyclodextrin (beta-CD) was obtained by reaction of beta-CD with gamma-isocyanatopropyltriethoxysilane (IPTS), followed by hydrolysis/condensation reactions, generating a beta-CD-modified polysilsesquioxane resin (PSS-beta-CD). PSS-beta-CD hybrid was characterized by infrared spectroscopy and (13)C and (29)Si nuclear magnetic resonance. This hybrid was typically amorphous and thermally stable up to 180 degrees C. PSS-beta-CD was able to form films and its morphology was evaluated by scanning electron microscopy. The capability of beta-CD grafted in the hybrid polymer to form inclusion complex was evaluated by the formation of a beta-CD-phenolphthalein complex using UV-Vis spectroscopy. Even without changes in pH, the red form of phenolphthalein converts to the colorless one when PSS-beta-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 beta-CD cavity, favoring the colorless form of phenolphthalein by more than 15 kcal mol(-1). (AU) | |
| FAPESP's process: | 03/09926-1 - Polymeric and ceramic materials |
| Grantee: | Inez Valeria Pagotto Yoshida |
| Support Opportunities: | PRONEX Research - Thematic Grants |