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Development of polylactic acid nanocomposite films reinforced with cellulose nanocrystals derived from coffee silverskin

Authors
Sung, Soo HyunChang, YoonjeeHan, Jaejoon
Issue Date
1-8월-2017
Publisher
ELSEVIER SCI LTD
Keywords
Polylactic acid; Cellulose nanocrystals; Coffee silverskin; Biopolymer film; Extrusion
Citation
CARBOHYDRATE POLYMERS, v.169, pp.495 - 503
Indexed
SCIE
SCOPUS
Journal Title
CARBOHYDRATE POLYMERS
Volume
169
Start Page
495
End Page
503
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/82591
DOI
10.1016/j.carbpol.2017.04.037
ISSN
0144-8617
Abstract
Bio-nanocomposite films based on polylactic acid (PLA) matrix reinforced with cellulose nanocrystals (CNCs) were developed using a twin-screw extruder. The CNCs were extracted from coffee silverskin (CS), which is a by-product of the coffee roasting process. They were extracted by alkali treatment followed by sulfuric acid hydrolysis. They were used as reinforcing agents to obtain PLA/CNC nanocomposites by addition at different concentrations (1%, 3%, and 5% CNCs). Morphological, tensile, and barrier properties of the bio-nanocomposites were analyzed. The tensile strength and Young's modulus increased with both 1% and 3% CNCs. The water vapor permeability decreased gradually with increasing addition of CNCs up to 3% and good oxygen barrier properties were found for all nanocomposites. These results suggest that CNCs from CS can improve the physical properties of PLA-based biopolymer film. The developed PLA/CNC bio-nanocomposite films can potentially be used for biopolymer materials with enhanced barrier and mechanical properties. (C) 2017 Elsevier Ltd. All rights reserved.
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