可降解聚碳酸亚丙酯复合材料的性能

Properties of Degradable Polypropylene Carbonate Composite Materials

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。

The blending modification of poly（propylene carbonate）（PPC）and polylactic acid can raise the thermal performance,mechanical properties and biodegradability.The properties of composites were investigated by SEM,XRD,DSC,TG and tensile test.The results showed that no chemical reaction had occurred,and the blends were partially compatible.The thermal properties of PPC were improved.The optimal Tg of composites was 30 ℃ higher than that of PPC.The optimal Td5% of composites was 42 ℃ higher than that of PPC.The optimal Td50% of composites was 67 ℃ higher than that of PPC.With the PLA addition,the degradation of composites was better than that of PPC.After 40 day degradation,the largest weight loss rate of composites was 33.37% which was 9 times of that of PPC.The PPC-PLA composites had good film forming ability and the film transparent and uniform.The tensile strength of composites ranges from 36 to 58 MPa.The maximum young＇s modulus of composites was 2 943 MPa.