Study On The Modification Of Poly(lactic Acid) And Poly(butylene Succinate) Composites

In recent years，with the increasingly serious problem of environmental pollution andthe development of materials science，research environment-friendly materials and expandits application areas have been an important trend.Poly(lactic acid), with high biocompatibility, tensile strength and modulus, but lowtoughness and thermal stability has attracted great attention in recent years. Poly (butylenesuccinate)(PBS) has a relatively good mechanical properties， thermal stability，especially， its impact strength and elongation at break. Usually PBS is used as tougheningmodifier of other biodegradable materials. The overall performance of the PLA/PBScomposites can be prepared. PLA/PBS composites can retain the advantages of the originalcomponents, and has some new features. PLA/PBS biodegradable composite has a highapplication value, and a variety of advantages such as high strength, high modulus and highelongation at break, high toughness.The main conclusions are listed as follows.Fully biodegradable poly (lactic acid)/biodegradable poly(butylenes succinate)(PLA/PBS) blends was prepared via melt mixing method and studied the irnpact of the blendssystem on the crystallization rate and mechanieal properties with the combined effect ofDCP,MAH,BF. The changes of structure, thermal properties and mechanical properties ofblends were analysed with FTIR, SEM, DSC and mechanical test. PLA/PBS composites arepartially compatible.In the melt blending process，A certain degree of transesterificationreaction between the polyester component of PLA/PBS composites. Therefore, thecompatibility of the blends has been improved.Increasing PBS content ignificantly increasethe elongation at break and the impact strength of the blends, and yet led to decrease slightlyin tensile strength. The addition of DCP and MAH improved the compatibility of PLA/PBScomposites and the elongation at break and impact strength was significantly increasedbecause of the graft copolymer as a compatibilizer to achieve the purpose of in situreactive compatibilization.so，the toughness of PLA/PBS composite was significantlyimproved largely. Increasing PBS content led to decrease slightly in tensile strength of theblends. And, the addition of BF effectively increased the tensile strength, impact strength andthermal stability of PLA/PBS composites. Finafinally, the biodegradable PLA/PBS composites with super properties and wideapplications have been prepared.