PVA/MMT纳米复合材料的制备及性能表征

Preparation and performance of the PVA/MMT nano-composite

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。

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.