Inorganic filled modified PBAT
Due to its extremely small particle size and high activity, CaCO3 has a high reinforcing effect in PBAT modification. A certain amount of compatibilizer needs to be added when using CaCO3 to blend PBAT to improve the physical and mechanical properties of the product. The material modified by CaCO3 can be rapidly and completely biodegraded, and the product cost is greatly reduced, and it has better practical operability for the manufacture of film bags and other products.
Some scholars have found that when the superfine CaCO3 is used to fill and modify PBAT, when the mass fraction of superfine CaCO3 is 10% and the mass fraction of compatibilizer is 3 parts, the tensile strength of PBAT/ultrafine CaCO3 blends. Performance has been greatly improved. When the mass fraction of ultrafine CaCO3 reaches 20%, the film bag still has good mechanical properties. In addition to CaCO3, talc and montmorillonite can also be used as inorganic fillers to modify PBAT, which can effectively reduce the cost of PBAT blends and enhance some properties.
The research shows that the PBAT/CaCO3 composite prepared by filling with 50% surface-modified CaCO3 has good mechanical properties; and the modified CaCO3 is uniformly dispersed in the PBAT matrix and has good interfacial adhesion.
MMT-201 and MMT-1 were obtained by treating MMT with different ionic liquids, which were used to fill PBAT to prepare nanocomposites. The study found that the composite can increase the tensile modulus of elasticity by up to 25%, while reducing the barrier properties to water and CO2.
The study showed that the tensile elastic modulus and tensile strength of PBAT/nanoscale CaCO3 composites were significantly improved compared with blank PBAT; however, the photooxidation rate of the matrix was slightly increased due to the presence of CaCO3. Intercalated and exfoliated PBS/PBAT/organized montmorillonite (OMMT) nanocomposites were prepared. The enhancement of OMMT was found to improve the compatibility, mechanical properties and thermal stability of the nanocomposites.
