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通过微波水解法制备了ZnO柱撑皂石,并以其为加工助剂制备了聚乳酸(PLA)/ZnO柱撑皂石纳米复合材料.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、对ZnO柱撑皂石及PLA/ZnO柱撑皂石纳米复合材料的结构进行了表征,并对其力学性能和热稳定性能进行了测试.微观结构分析表明,ZnO柱撑皂石呈现剥离状,并均匀分散在PLA基质中.力学性能研究表明0.3%ZnO柱撑皂石的加入有助于改善PLA复合材料的断裂伸长率.SEM分析表明PLA复合材料的断面发生明显改变,表现良好韧性;DSC结果显示纳米ZnO柱撑皂石可以降低复合材料的玻璃化转变温度、结晶温度,有助于提高PLA复合材料的结晶度,与XRD分析相吻合;热重分析表明ZnO柱撑皂石可以提高PLA复合材料的热稳定性.测试结果表明,ZnO柱撑皂石在PLA基质中起到了异相成核的作用,促进了PLA基质的结晶.
ZnO pillared saponite was prepared by microwave hydrolysis and polylactic acid (PLA) / ZnO pillared soapstone nanocomposites were prepared by using it as a processing aid. The structure of the nanocomposite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) , Transmission electron microscopy (TEM), the structure of ZnO pillared soapstone and PLA / ZnO pillared soapstone nanocomposites were characterized and their mechanical properties and thermal stability were tested.Microstructure analysis showed that ZnO The pillared soapstone is peeled off and uniformly dispersed in the PLA matrix.The mechanical properties show that the addition of 0.3% ZnO palygorskite helps to improve the elongation at break of PLA composites.The SEM analysis shows that the cross section of PLA composite The results show that the nano-ZnO pillared soapstone can reduce the glass transition temperature and crystallization temperature of the composites, which can improve the crystallinity of PLA composites, which is in good agreement with XRD analysis. Thermogravimetric analysis The results show that ZnO pillared soap can increase the thermal stability of PLA composites.The results show that ZnO pillared bar plays the role of heterogeneous nucleation in PLA matrix and promotes the crystallization of PLA matrix.