Study Of The Mechanical Properties And Degradation Properties Of PLA/PPC Blends

Poly (lactic acid)(PLA) and Poly(propylene carbonate)(PPC) are a biodegradable polymer material. PLA/PPC blends were prepared by solution method, By polarized optical microscope (POM), Infrared spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR),differential scanning calorimetry(DSC), and wide-angle X-ray diffraction (WAXD), Thermal gravimetric analysis(TG) and Universal testing machine equipments, morphology、mechanical properties and degradation properties of PLA/PPC blends were analyzed, The results show that:PLA/PPC blends which were prepared by solution method were analyzed by FRIR and|HNMR, the results show that there is no chemical reaction between PLA and PPC, it is only physical blending. In the crystallization process, with the increase of PPC, the crystallinity and the nucleation density of PLA/PPC blends decreased, the nucleation size was increased, these were observed by POM.The result of DSC and WAXD show that, the crystallinity of the PLA/PPC blends which were made in solvent decreased with the increasing of the PPC content. The result of DSC and TG show that the PLA can improve the thermal property, PLA also improve the thermal stability of PLA/PPC blends.The result of Universal testing machine equipment show that,with the percentage of the PPC, which can improve the PLA/PPC blends elongation at break, it was a good way to solve the fragility of the PLA, The mechanical properties of the PLA/PPC were improved.The results of degradation experiment show that the degradation rates of the PLA/PPC blends were increased with the increasing of the PPC content. Carboxyl end group that exist in PPC can promote degradation of the PLA.