Mechanical, Thermal and Barrier Properties of Poly(butylene adipate-co-terephthalate) Biocomposite Films Incorporated with Nano-Calcium Carbonate and Glycerol
Keywords:
PBAT, Nano-calcium carbonate, bioplastic, food packaging, plastic filmAbstract
This research aims to improve the mechanical, thermal and barrier properties of poly (butylene adipate-co-terephthalate) (PBAT) bioplastic by compounding with nano-calcium carbonate (CaCO3) and glycerol. Firstly, the compounding pellets were prepared by incorporating 5, 7 and 10 wt% CaCO3 and 5 parts per hundred of resin (phr) of glycerol using a twin-screw extruder. Then, these pellets were processed into films using blown film extrusion. It found that the addition of 5 wt% CaCO3 into PBAT (PBAT5C) resulted in increasing tensile strength and melting temperature of PBAT. It can also reduce oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) compared with PBAT films. In addition, the inclusion of 5 phr of glycerol in PBAT5C (PBAT5G5C) improved the dispersion of nano-calcium carbonate within the PBAT film, resulting in substantial improvements in the mechanical, thermal and barrier properties of the PBAT5G5C film compared with the PBAT5C film. Therefore, the PBAT5G5C film is suitable for use as a packaging film for food products that require low OTR and WVTR. This provides an alternative to replace conventional plastics that are difficult to decompose.
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