THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS

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 chitosan...

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Autores principales:	RETUERT,JAIME, FUENTES,SANDRA, GONZÁLEZ,GUILLERMO, BENAVENTE,ROSARIO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2000
Materias:	Chitosan films microhardness
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000200021
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spelling	oai:scielo:S0366-164420000002000212000-08-25THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMSRETUERT,JAIMEFUENTES,SANDRAGONZÁLEZ,GUILLERMOBENAVENTE,ROSARIO Chitosan films microhardness 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 chitosan is 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° C) reaching a constant value 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 filmsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaBoletín de la Sociedad Chilena de Química v.45 n.2 20002000-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000200021en10.4067/S0366-16442000000200021
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chitosan films microhardness
spellingShingle	Chitosan films microhardness RETUERT,JAIME FUENTES,SANDRA GONZÁLEZ,GUILLERMO BENAVENTE,ROSARIO THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS
description	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 chitosan is 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° C) reaching a constant value 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
author	RETUERT,JAIME FUENTES,SANDRA GONZÁLEZ,GUILLERMO BENAVENTE,ROSARIO
author_facet	RETUERT,JAIME FUENTES,SANDRA GONZÁLEZ,GUILLERMO BENAVENTE,ROSARIO
author_sort	RETUERT,JAIME
title	THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS
title_short	THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS
title_full	THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS
title_fullStr	THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS
title_full_unstemmed	THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS
title_sort	thermal effect on the microhardness of chitosan films
publisher	Sociedad Chilena de Química
publishDate	2000
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000200021
work_keys_str_mv	AT retuertjaime thermaleffectonthemicrohardnessofchitosanfilms AT fuentessandra thermaleffectonthemicrohardnessofchitosanfilms AT gonzalezguillermo thermaleffectonthemicrohardnessofchitosanfilms AT benaventerosario thermaleffectonthemicrohardnessofchitosanfilms
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THERMAL EFFECT ON THE MICROHARDNESS OF CHITOSAN FILMS

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