Wheat straw hemicelluloses added with cellulose nanocrystals and citric acid. Effect on film physical properties

Wheat straw has been used as a source of hemicelluloses (WSH) and cellulose nanocrystals (CNC) for the elaboration of biodegradable films. Different films have been formed by using WSH as a matrix and different contents of CNC and citric acid. The predominant hemicelluloses were arabinoxylans. CNC r...

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Detalles Bibliográficos
Autores: Pereira, Paulo H. F. [UNESP], Waldron, Keith W., Wilson, David R., Cunha, Arcelina P., Brito, Edy S. de, Rodrigues, Tigressa H. S., Rosa, Morsyleide F., Azeredo, Henriette M. C.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:Brasil
Institución:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/159496
Acceso en línea:http://dx.doi.org/10.1016/j.carbpol.2017.02.019
http://hdl.handle.net/11449/159496
Access Level:acceso abierto
Palabra clave:Biodegradable films
Bionanocomposites
Crosslinking
Nanocellulose
Cellulose whiskers
Descripción
Sumario:Wheat straw has been used as a source of hemicelluloses (WSH) and cellulose nanocrystals (CNC) for the elaboration of biodegradable films. Different films have been formed by using WSH as a matrix and different contents of CNC and citric acid. The predominant hemicelluloses were arabinoxylans. CNC reinforced the films, improving tensile strength and modulus, water resistance and water vapor barrier. Citric acid, on the other hand, presented concomitant plasticizing and crosslinking effects (the latter also evidenced by FTIR), probably due to a crosslinking extension by glycerol. The use of 5.9 wt% CNC and 30 wt% citric acid was defined as optimal conditions, resulting in minimum water sensitivity and permeability, while maintaining a good combination of tensile properties. Under those conditions, the films presented enhanced modulus, elongation, water resistance, and barrier to water vapor when compared to the control WSH film, and might be used for wrapping or coating a variety of foods. (C) 2017 Elsevier Ltd. All rights reserved.

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