| Revista: | Polimeros (Sao Carlos) |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000314215 |
| ISSN: | 1678-5169 |
| Autores: | Thire, Rossana M.S.M1 Andrade, Cristina T Simao, Renata A2 |
| Instituciones: | 1Universidade Federal do Rio de Janeiro, Instituto de Macromoleculas Professora Eloisa Mano, Rio de Janeiro. Brasil 2Universidade Federal do Rio de Janeiro, Rio de Janeiro. Brasil |
| Año: | 2005 |
| Periodo: | Abr-Jun |
| Volumen: | 15 |
| Número: | 2 |
| Paginación: | 130-133 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | Aging of cornstarch films prepared by casting was investigated. Water and glycerol-plasticized cornstarch films were stored at 50% relative humidity over a period of 330 days. Aging was followed by X-ray diffraction (XRD) and atomic force microscopy (AFM). XRD spectra indicated development of B-type crystallinity even for fresh films and that the crystallinity index increased from 0.06 to 0.28 as a function of storage time. AFM images of 270-day-old films revealed that the general morphology and the overall roughness have not changed due to aging. AFM phase contrast images at higher magnification showed an increasing number of ordered domains at the surface of these films, which may be attributed to recrystallization of amylose. No morphological change was observed at least at the surface of the granular region, which is enriched in amylopectin |
| Disciplinas: | Química |
| Palabras clave: | Química de polímeros, Biopolímeros, Películas, Harina de maíz, Envejecimiento, Microscopía de fuerza atómica, Difracción de rayos X |
| Keyword: | Chemistry, Polymer chemistry, Biopolymers, Films, Corn starch, Aging, Atomic force microscopy, X-ray diffraction |
| Texto completo: | Texto completo (Ver HTML) |
