Influence of Biaxial Stretching Ratio on the Mechanical and Oxygen Barrier Properties of TPS/PBAT/Talc Biodegradable Films

 Thermoplastic starch (TPS)/poly(butylene adipate-co-terephthalate) (PBAT) blends are biodegradable materials that can be used for flexible packaging applications. In our previous study, talc was added to TPS/PBAT films, and the effects of talc loading on the mechanical and oxygen barrier properties were investigated. In this study, the talc content was fixed based on the previous results, and the effect of biaxial stretching ratio on the properties of TPS/PBAT films was examined. TPS/PBAT/talc films were prepared using a twin-screw extruder and then subjected to simultaneous biaxial stretching at different stretching ratios. Mechanical properties were evaluated using UTM, thermal behavior was analyzed by DSC, film morphology was examined by SEM, and oxygen barrier performance was assessed by oxygen permeability measurements. This study compared the effects of different biaxial stretching ratios on TPS/PBAT/talc biodegradable films. The results showed that the stretching ratio affected the film structure, mechanical properties, and oxygen barrier performance. The results of this study are expected to support the use of biodegradable materials in flexible packaging applications.