| Texto completo | |
| Autor(es): |
Porto, Deyvid S.
;
de Faria, Clara Maria Gonsalves
;
Inada, Natalia M.
;
Frollini, Elisabete
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | International Journal of Biological Macromolecules; v. 236, p. 14-pg., 2023-03-17. |
| Resumo | |
To simultaneously form films while synthesizing solvent-free and catalyst-free bio-based polyurethanes, hex-amethylene diisocyanate trimer was selected as an isocyanate group source to produce a low-viscosity reaction medium for dispersing high contents of microcrystalline cellulose (MCC, polyol) and cellulose nanocrystals (CNC). Castor oil was used as an additional polyol source. Up to 80 % of the MCC was dispersed, producing a film exhibiting the highest Tg (72 degrees C), tensile strength (18 MPa), and Young's modulus (522.4 MPa). 12.5 % (30 % MCC) and 7.5 % (50 % MCC) of CNC dispersed in the reaction medium formed films stiffer than their coun-terparts. All the films exhibited transparency and high crystallinity. The contact angle/zeta potential (zeta) indi-cated hydrophobic film surfaces. At pH 7.4, zeta suggested that the films interacted with physiological fluids favorably. The films were non-cytotoxic, and the composites exhibited cell growth compared with the control. The reported results, as far as it is known, are unprecedented. (AU) | |
| Processo FAPESP: | 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica |
| Beneficiário: | Vanderlei Salvador Bagnato |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |