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通过聚碳酸亚丙酯(PPC)与聚乳酸(PLA)的共混,提高PPC的热性能、力学性能、生物降解性。利用扫描电子显微镜(SEM)、多晶X衍射(XRD)、差示扫描量热(DSC)、热重分析(TG)、拉伸力学实验研究了复合材料的性能。实验结果表明,聚合物之间没有发生化学反应,共混物为部分相容的体系;复合材料的玻璃化转变温度最高比PPC提高30℃,分解温度Td5%最多比PPC提高42℃,Td50%最多比PPC提高67℃;PLA的加入使复合材料的降解性能优于PPC,40d降解后复合材料最大失重率为33.37%,是PPC的9倍;PPC-PLA复合材料有良好的成膜性,制备的薄膜透明均匀,复合薄膜材料拉伸强度为36～58MPa,杨氏模量最大为2943MPa。
Through the blending of polypropylene carbonate (PPC) and polylactic acid (PLA), the thermal, mechanical and biodegradability of PPC are improved. The properties of the composites were investigated by scanning electron microscopy (SEM), poly X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TG) The experimental results show that there is no chemical reaction between the polymers and the blend is partially compatible. The highest glass transition temperature of the composite is 30 ℃ higher than PPC, the decomposition temperature Td5% is up to 42 ℃ higher than PPC, Td50% The maximum weight loss rate of composite was 33.37%, which is 9 times that of PPC after 40 days degradation. The PPC-PLA composite has good film-forming property, The prepared film is transparent and uniform, and the tensile strength of the composite film material is 36-58 MPa and the Young’s modulus is 2943 MPa.