PVA／MMT纳米复合材料的制备及性能表征

采用溶液插层-流延成膜法，以聚乙烯醇和钠质蒙脱土为原料，制备出不同蒙脱土含量的PVA／MMT纳米复合材料薄膜，采用XRD，FTIR，SEM对纳米复合材料的结构进行了表征，并用TGA测试了纳米复合材料的热性能，同时，测试了纳米复合材料的力学性能和耐水性能。XRD测试结果表明，复合材料中的蒙脱土的片层间距显著增大，表明PVA分子进入了蒙脱土片层之间。FT—IR分析可以看出，蒙脱土的加入使PVA中C—O的伸缩振动峰变弱。SEM观察到纳米复合材料断裂时裂纹的微观结构。TGA测试表明，纳米复合材料的热分解温度比纯PVA有较大提高。该纳米复合材料具有良好的力学性能和耐水性，可作为一种新型的包装材料。

Preparation and performance of the PVA/MMT nano-composite

With PVA solution and MMT aqueous suspension as raw materials,by means of solution-intercalation film-casting method,PVA/MMT nano-composites with different montmorillonite contents is prepared.The microstructures of the nano-composites is investigated using XRD,FTIR and SEM,and its heat property is tested with TGA while the mechanics and anti-water ability are also tested.The XRD results reveal that the interlayer space of MMT increases in the composite which indicates that the PVA chains has been intercalated into the layers.FT-IR results indicate that flex vibration peak of C-O becomes weak when MMT is added.SEM results show the micro structure of the composite when it has the cracks.TGA results show that the heat-decompose temperature is increased coMPared with that of pure PVA.The nano-composite,as a new package material,has a good mechanical features and anti-water ability.