Polylactic acid (PLA) has excellent biocompatibility and biodegradability, and its degradation occurs under the conditions of industrial composting. The final products of complete degradation are carbon dioxide and water, which will not pollute the environment.
PLA has high tensile strength and tensile elastic modulus, but its high hardness and poor toughness limit its application range. Using PLA as the filler of PBAT can effectively improve the tensile properties of PBAT, reduce the hardness of PLA when used alone, and improve its toughness, and finally obtain a product with good comprehensive properties. Therefore, the use of PLA to enhance the modification of PBAT is a very efficient method.
PBAT/PLA/TiO2 composites were prepared by mechanical blending method. The results show that the addition of PLA and TiO2 can toughen and strengthen the PBAT/PLA/TiO2 composite, and can improve its mechanical properties and thermal stability.
PBAT/PLA composites reinforced with CaCO3 particles were prepared, and the results showed that CaCO3 improved the interfacial compatibility between the polymers in the matrix, and a low-cost flexible film could be obtained.
PBAT/PLA composites were modified with calcium carbonate (CaCO3), and PBAT/PLA/CaCO3 blend films were successfully prepared by blown film method. The effect of CaCO3 on PBAT/PLA composites was studied. The results show that the addition of CaCO3 greatly increases the thermal stability of the PBAT/PLA composites and reduces the crystallinity of the PBAT/PLA composites. At the same time, CaCO3 significantly enhances the PBAT/PLA composites. The mechanical properties of the film have been well improved. The transverse and longitudinal tensile strengths have increased from 21.06 MPa and 24.35 MPa to 24.3 MPa and 28.7 MPa, respectively, and the hardness has reached 51. The addition of CaCO3 increases the complex viscosity, storage modulus and loss modulus of PBAT/PLA composites to a certain extent, which further proves that CaCO3 improves the bonding strength of the two-phase interface.
