NaOH treatment of chitosan films: Impact on macromolecular structure and film properties.
Carbohydr Polym
; 132: 25-30, 2015 Nov 05.
Article
em En
| MEDLINE
| ID: mdl-26256320
In this paper, we examine the significance of treatment with NaOH on chitosan (CH) film structure to obtain biodegradable materials for several applications. In order to determine the structure of the films, an analysis based on SEM, FTIR spectroscopy and X-ray diffraction data was performed. In addition, the consequences of this treatment were evaluated by swelling index measurements and mechanical testing. As result of FTIR and X-ray analysis, three effects were identified: the deprotonation and phosphate extraction, which allowed new hydrogen bonds to form, and a higher CH deacetylation. These studies also revealed that two hydrated and anhydrous polymorphs were present in the CH-NaOH films. Moreover, the new hydrogen bond and the reduction of N-acetyl groups produced films with a more compact and disordered structure, reducing their swelling characteristics and increasing their brittleness. The introduction of a mild NaOH treatment is a versatile tool to obtain chitosan films with interesting and tunable properties.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Hidróxido de Sódio
/
Quitosana
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Carbohydr Polym
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Reino Unido