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

作者：Sung Soo Hyun; Chang Yoonjee; Han Jaejoon^*

来源：Carbohydrate Polymers, 2017, 169: 495-503.

DOI：10.1016/j.carbpol.2017.04.037

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

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.

• 出版日期2017-8-1