二硫化钼纳米片层的制备及其填充的聚乙烯醇复合材料性能

Preparation of MoS_2 Nanosheets and Properties of Their PVA Composites

利用萘钠插层法剥离制备二硫化钼纳米片层,原子力显微镜(AFM)和透射电子显微镜(TEM)等测试结果表明,其厚度可达几个纳米。同时,利用溶液共混涂膜法制备得到MoS_2/PVA(聚乙烯醇)纳米复合材料,并进行了TEM测试,结果显示:MoS_2片层很好地分散在PVA基体中。测试结果表明,MoS_2/PVA纳米复合材料的热稳定性和玻璃化转变温度都得到提高。加入质量分数1.0%MoS_2纳米片层的PVA复合材料的拉伸强度提高了85%,杨氏模量提高了49%。与纯PVA相比,MoS_2/PVA纳米复合材料的热性能和机械性能也有明显的提高,原因主要是MoS_2纳米片层在PVA基体中分散较好,并且PVA和MoS_2之间存在较强的相互作用力。

We have prepared MoS2 nanosheets by intercalatation with sodium naphthalenide.Atomic force microscope（AFM）and transmission electron microscopy（TEM）results indicated that the thickness of the nanosheets is several nanometers.MoS2/PVA nanocomposites were also prepared by solvent blending and coating method.TEM analysis indicates that MoS2 nanosheets were well dispersed into the PVA matrix.The thermal stability and glass transition temperature（Tg）of MoS2/PVA nanocomposites were improved.Tensile test showed a 85%increase in tensile strength and a 49%improvement in Young′s modulus upon incorporation of only 1.0% of MoS2 nanosheets.The improvements in the thermal and mechanical properties of MoS2/PVA nanocomposites were attributed to the good dispersion of MoS2 nanosheets and strong interactions between PVA and MoS2.