摘要
采用超声辅助真空装置制备石墨烯纳米片(GNPs)/聚乙二醇(PEG)复配改性剂,通过熔融共混法制备了一系列聚乳酸(PLA)/GNPs、PLA/GNPs/PEG复合材料,利用扫描电子显微镜(SEM)、X-射线衍射仪(XRD)、差示扫描量热仪(DSC)、偏光显微镜(POM)和万能试验机对其断面形貌、结晶行为和力学性能进行研究。结果表明,添加复配改性剂GNPs/PEG后,PLA基复合材料的断面出现明显的PLA纤维,呈现韧性断裂; GNPs或GNPs/PEG的添加未改变PLA的晶型,当GNPs/PEG为0. 1%时,PLA基复合材料的结晶度达到38. 50%,比纯PLA提高了27. 99%; GNPs/PEG的添加也有效地改善了PLA的拉伸强度和缺口冲击强度,分别比纯PLA的提高了13. 32%和51. 9%。
Graphene nanoplatelets( GNPs)/polyethylene glycol( PEG) compounding modifiers were prepared by the ultrasonic oscillation with vacuum infusion device,a series of polylactic acid( PLA)/GNPs and PLA/GNPs/PEG composite were prepared by melt blending. The morphology,crystallization behavior and mechanical properties of PLA-based composite were studied by scanning electron microscopy( SEM),X-ray diffraction( XRD),differential scanning calorimeter( DSC),polarizing microscope( POM) and universal testing machine,respectively. Results indicated that the fracture surface of PLAbased composite appeared obvious fiber after addition of the GNPs/PEG modifier. The addition of GNPs and/or GNPs/PEG did not change the crystalline form of PLA. The crystallinity of PLA-based composite reached 38. 50% when the content of GNPs/PEG was 0. 1%,compared to pure PLA,which increased by 27. 99%. Additionally,with the addition of GNPs/PEG,the tensile strength and elongation at break of PLA increased by 13. 32% and 51. 9%,respectively.
引文
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