Preparation and Properties of Biodegradable Nano-CaCO3/BF/PHA/PE Composites.

In this study, polyethylene (PE) was used as the raw material, and polyhydroxyalkanoate (PHA), modified nano-CaCO₃ and bagasse fiber(BF) were used as the composite fillers, and the nano-CaCO₃/BF/PHA/PE composites were prepared by melt extrusion and injection molding. The effects of the optimal ratios of PHA, modified nano-CaCO₃ and BF and their contents on the internal structure and properties of the composites were investigated by mechanical property tests, Fourier transform infrared spectroscopy (FTIR) analysis, thermogravimetric (TG) analysis, scanning electron microscopy (SEM) and other characterization methods. The results show that with 5% PHA, 5% BF, and 5% nano-CaCO₃, the mechanical properties of the composites were optimal at 12.9 MPa, and the maximum thermal decomposition temperature of the nano-CaCO₃/BF/PHA/PE composites reached 437 °C at this ratio, which was higher than the thermal decomposition temperature (453 °C) of the composites before modification. The study provides ideas for the green development of degradable polymer materials. [ABSTRACT FROM AUTHOR]