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Titolo:
Thermal effect on the microhardness of chitosan films.
Autore:
Retuert, J; Fuentes, S; Gonzalez, G; Benavente, R;
Indirizzi:
Univ Chile, Fac Ciencias Fis & Matemat, Dept Quim, Santiago, Chile Univ Chile Santiago Chile ias Fis & Matemat, Dept Quim, Santiago, Chile Univ Chile, Fac Ciencias, Dept Quim, Santiago, Chile Univ Chile SantiagoChile ile, Fac Ciencias, Dept Quim, Santiago, Chile Inst Ciencia & Tecnol Polimeros, E-28006 Madrid, Spain Inst Ciencia & Tecnol Polimeros Madrid Spain E-28006 28006 Madrid, Spain
Titolo Testata:
BOLETIN DE LA SOCIEDAD CHILENA DE QUIMICA
fascicolo: 2, volume: 45, anno: 2000,
pagine: 323 - 327
SICI:
0366-1644(200006)45:2<323:TEOTMO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEACETYLATED CHITIN; HYBRID MATERIALS; MEMBRANES; ACETYLATION;
Keywords:
chitosan; films; microhardness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Retuert, J Univ Chile, Fac Ciencias Fis & Matemat, Dept Quim, Casilla 2777, Santiago,Chile Univ Chile Casilla 2777 Santiago Chile a 2777, Santiago,Chile
Citazione:
J. Retuert et al., "Thermal effect on the microhardness of chitosan films.", BOL SOC CH, 45(2), 2000, pp. 323-327

Abstract

In this communication we present the results obtained from a study on the effect of thermal treatments of chitosan films with different molecular weights, but with a similar acetilation degree, carried out by microhardness. It was found that the hardness of films prepared from both type of chitosanis similar, of approximately 190 mPa. This suggest that this property is almost independent from the molecular weight in a wide range. The hardness increases notably with a moderate heating (60 degrees C) reaching a constantvalue of about 450 Mpa after 60 minutes at this temperature. This is attributed to the loss of water and the formation of new intermacromolecular bonds leading to a more compact network. The increase of hardness is accompanied by an increase in the fragility of the films.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:17:26