High Strength and Barrier Properties of Biodegradable PPC/PBSA Blends Prepared by Reaction Compatibilization for Promising Application in Packaging

摘要

Poly(propylene carbonate) (PPC)/poly(butylene succinate-co-butylene adipate) (PBSA) blends are prepared via melt mixing using a twin-screw extruder. A one-step method based on the reaction compatibilization mechanism is used to prepare PPC/PBSA/AX8900(ethylene-methyl acrylate-glycidyl methacrylate random terpolymer) blends. The films of blends are prepared by an extrusion blown film machine. Fourier transform infrared spectroscopy results show that there is a strong hydrogen bonding between PPC and PBSA. The epoxy group of AX8900 can react with molecular chains of PPC and PBSA. It is shown from the rheological behavior that AX8900 can extend the molecular chains and increase the compatibility of PPC and PBSA. The films of PPC/PBSA blends exhibit more orientation structure than pure PPC film. The tensile strength of machine direction and transverse direction for 70PPC/30PBSA/1AX8900 film is higher than that for pure PPC film. The PPC/PBSA/AX8900 films have similar excellent barrier properties, compared with PPC film. The modified Maxwell theoretical model is used to predict and analyze changes in film barrier properties.

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