氧化石墨烯接枝聚乙二醇对左旋聚乳酸结晶行为和热稳定性的影响  

Effects of graphene oxide grafted polyethylene glycol on crystallization behavior and thermal stability of poly(L-lactic acid)

作　　者：李守佳 罗春燕[1,2] 陈卫星 方铭港[1] 孙健鑫 LI Shoujia;LUO Chunyan;CHEN Weixing;FANG Minggang;SUN Jianxin(School of Materials Science and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China;Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices,Xi’an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,西安710021 [2]陕西省光电功能材料与器件重点实验室,西安710021

出　　处：《材料工程》2022年第8期99-106,共8页Journal of Materials Engineering

基　　金：国家自然科学基金青年科学基金项目(21506167);陕西省自然科学基础研究计划资助项目(2021 JM-431);西北大学文化遗产研究与保护技术教育部重点实验室开放课题(wysys201906)。

摘　　要：为改善聚乳酸的结晶性能和热稳定性,通过酯化反应将聚乙二醇(PEG)接枝到氧化石墨烯(GO)表面,制备出表面修饰PEG的GO(GO-g-PEG)作为聚乳酸的结晶促进剂。利用溶液共混法制备出不同GO-g-PEG含量的GO-g-PEG/左旋聚乳酸(PLLA)复合材料,通过傅里叶变换红外光谱仪(FTIR)和X射线衍射仪(XRD)表征分析证实PEG成功接枝到GO表面。通过差示扫描热量仪(DSC)、热台偏光显微镜(POM)和热重分析仪(TGA)研究GO-g-PEG对PLLA结晶行为和热稳定性的影响。结果表明:在GO-g-PEG的异相成核及增塑作用下,GO-g-PEG/PLLA复合材料结晶成核密度明显增大,结晶能力和结晶度提高;在PEG接枝量为11.8%(质量分数)时,GO-g-PEG/PLLA复合材料的热分解温度较纯PLLA提高20℃左右。In order to improve the crystallization properties of polylactic acid,the crystallization accelerator of graphene oxide grafted polyethylene glycol(GO-g-PEG)was prepared by esterification.The GO-g-PEG/poly(L-lactic acid)(PLLA)composite materials with different GO-g-PEG contents were prepared by solution blending method,and the structure was confirmed by Fourier transform infrared spectroscopy(FTIR)and X-ray diffractometer(XRD).The effect of GO-g-PEG on the crystallization behavior and thermal stability of PLLA was studied by differential scanning calorimeter(DSC),polarizing microscope(POM)and thermogravimetric analyzer(TGA).The results show that under the heterogeneous nucleation and plasticization of GO-g-PEG,the crystallization nucleation density of GO-g-PEG/PLLA composites is increased significantly,the crystallization ability and crystallinity are improved;when the grafting amount of PEG is 11.8%(mass fraction),comparing the thermal stability of GO-g-PEG/PLLA composites with PLLA neat,the thermal decomposition temperature of GO-g-PEG/PLLA composites is increased by about 20℃.

关 键 词：氧化石墨烯 聚乙二醇 左旋聚乳酸 异相成核 结晶行为 热稳定性 

分 类 号：O631[理学—高分子化学]