中文摘要：

采用溶液共混-絮凝-熔融压片的方法制备聚乳酸（PLA）／氧化石墨（GO）复合材料并对其形貌和性能进行研究。扫描电子显微镜（SEM）和X射线衍射（XRD）结果表明：纯的聚乳酸断面光滑、平整；PLA／GO复合材料断面粗糙，GO层被PLA基体包覆，分散性较好，没有聚集现象；差示扫描量热仪（DSC）和热失重分析（TGA）分析表明：GO能较大提高PLA的热稳定性，与纯的PLA相比，在加入1％（质量分数）GO时，降解温度增加20℃，降解最快温度增加10℃；力学性能测试显示：当GO质量分数小于1％时，PLA／GO复合材料可以在保持断裂伸长率的同时增加拉伸强度。

英文摘要：

PLA/graphite oxide （GO） composites were prepared by solution mixing-coagulation-melt pressed processing techniques and the morphology and properties were studied. SEM images and XRD results showed that neat PLA exhibited relatively smooth fracture surface. PLA/GO composite exhibited relative rough fracture surface with GO layers dispersed homogeneously and coated in the PLA matrix. A higher magnifica- tion demonstrated that the GO was completely wrapped with the PLA without gathering. DSC and TGA analysis showed that the addition of GO into PLA lead to improved thermal performance compared to the pure PLA. When the content of GO was 1%, both the thermal degradation temperature and the temperature of maximum degradation rate of PLA/GO composites increased substantially as 20 ℃ and 10 ℃. Mechanical performance test showed that when mass fraction GO was less than 1%, PLA/GO composite material can keep break elongation and increase tensile strength.