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

Soo Hyun Sung, Yoonjee Chang, Jaejoon Han

Research output: Contribution to journalArticle

56 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)495-503
Number of pages9
JournalCarbohydrate Polymers
Volume169
DOIs
Publication statusPublished - 2017 Aug 1

Keywords

  • Biopolymer film
  • Cellulose nanocrystals
  • Coffee silverskin
  • Extrusion
  • Polylactic acid

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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