Polymer nanocomposite based on layered structure such as graphene, MoS 2 , MoO 3 and WS 2 has become an active field of research due to their exceptional thermal, mechanical and electrical properties. Achieving uniform dispersion of layered nanostructures within the polymer matrix is challenging because of the agglomeration of nanostructures which occurs due to the Van der Waals attraction and the cohesive nature between the two phases. In this work, we report the preparation of PVDF-modified MoS 2 nanocomposites by the solvent blending method. The XRD results reveal the interaction of the negatively charged surface of MoS 2 sheets and the positive CH 2 group of PVDF through the predomination of β -phase. Morphological observation through SEM suggests the MoS 2 induced formation of nanofibres in the composite. Enhancement in the thermal stability of the nanocomposite is observed and is possibly due to the heat barrier by the exfoliated MoS 2 which in turn supports the tortuous effect. The DSC of the PVDF-modified MoS 2 composite indicates the domination of β -phase and the hindrance to crystallization of PVDF. Improvement in the mechanical strength of the composites was also noticed on higher filler concentration.

中文翻译：

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表面改性二硫化钼对聚偏二氟乙烯结晶、热性能和机械性能的影响

基于石墨烯、MoS 2 、MoO 3 和WS 2 等层状结构的聚合物纳米复合材料由于其出色的热、机械和电性能而成为一个活跃的研究领域。由于范德华引力和两相之间的内聚性质会发生纳米结构的团聚，因此在聚合物基质中实现层状纳米结构的均匀分散具有挑战性。在这项工作中，我们报告了通过溶剂共混法制备 PVDF 改性的 MoS 2 纳米复合材料。XRD 结果揭示了MoS 2 片的带负电表面与PVDF 的正CH 2 基团通过β-相的主导相互作用。通过 SEM 的形态观察表明 MoS 2 诱导复合材料中纳米纤维的形成。观察到纳米复合材料的热稳定性增强，这可能是由于剥离的 MoS 2 的热屏障，这反过来支持曲折效应。PVDF 改性的 MoS 2 复合材料的 DSC 表明 β 相占主导地位，阻碍了 PVDF 的结晶。随着填料浓度的增加，复合材料的机械强度也有所提高。