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Nanocellulose Produced from Rice Hulls and its Effect on the Properties of Biodegradable Starch Films

Authors :
Pedro Nascimento
Renan Marim
Gizilene Carvalho
Suzana Mali
Source :
Materials Research, Vol 19, Iss 1, Pp 167-174 (2016)
Publication Year :
2016
Publisher :
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol), 2016.

Abstract

Rice hull is a residue from agro-industry that can be used to produce nanocellulose. We produced nanocellulose from rice hulls through bleaching (with a 5% NaOH solution followed by a peracetic acid solution) and acid hydrolysis at a mild temperature (45ºC) followed by ultrasonication. We investigated the microstructure, crystallinity and thermal stability of these materials and studied their effects on the properties of starch films. After bleaching, the compact structure around the cellulosic fibers was removed, and the lignin content of the residue decreased from 7.22 to 4.22%. The obtained nanocellulose presented a higher crystallinity (up 70%), higher thermal stability than the raw material and lignin contents below 0.35%. The nanocellulose formed interconnected webs of tiny fibers (< 100 nm in diameter), which decreased the opacity, water vapor permeability and improved the mechanical properties when added as reinforcement in the starch films.

Details

Language :
English
ISSN :
15161439 and 19805373
Volume :
19
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Materials Research
Publication Type :
Academic Journal
Accession number :
edsdoj.66c3511d1d694b41b6214ce169aac1f3
Document Type :
article
Full Text :
https://doi.org/10.1590/1980-5373-MR-2015-0423