The preparation of polylactic acid (PLA) and polypropylene carbonate (PPC) blend films by using the solvent casting method is to improve the properties of pure PLA. The blends' mechanical and thermal properties, morphological as well as hydrolytic degradation behavior are evaluated. The tensile test proved that the increase of PPC from 0 wt% to 75 wt% could improve the elongation of pure PLA when the graph showed a significant increase of the elongation from 10% to 1000%. Scanning Electron Microscopy (SEM) supported the significant increase in elongation of the blends when it shows a definite phase separation in 75/25 PLA/PPC, where 25% of PPC has formed islands in the PLA matrix. Differential scanning calorimetry indicates the partial miscibility of the blends where two peaks of the glass transition temperature moved towards each other when the amount of PPC increases. Fourier transform infrared (FTIR) spectroscopy revealed a possible intermolecular interaction between two polymers, which affects the miscibility of the blends. Finally, the hydrolytic degradation test indicates that the degradation started from the PLA phase and the blends' degradation rate decrease as wt% of PPC increase.

中文翻译：

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通过溶剂浇铸制备的聚乳酸/碳酸丙二酯共混物的机械，形态，热性能和水解降解行为

采用溶剂流延法制备聚乳酸（PLA）和碳酸丙二酯（PPC）共混薄膜是为了提高纯PLA的性能。评估了共混物的机械和热性能，形态以及水解降解行为。拉伸试验证明，当曲线图显示伸长率从10％显着增加到1000％时，PPC从0 wt％增加到75 wt％可以改善纯PLA的伸长率。当扫描电镜（SEM）在75/25 PLA / PPC中显示出明确的相分离时，表明共混物的伸长率显着增加，其中25％的PPC在PLA基质中形成了岛。差示扫描量热法表明当PPC的量增加时，玻璃化转变温度的两个峰朝向彼此移动时的混合物的部分混溶性。傅立叶变换红外（FTIR）光谱显示了两种聚合物之间可能存在的分子间相互作用，这影响了共混物的混溶性。最后，水解降解试验表明降解从PLA相开始，共混物的降解率随着PPC的wt％的增加而降低。