A new low-cost high-permittivity flexible nanocomposite consisting of a polyvinylidene fluoride (PVDF) matrix and fullerene-like tungsten disulfide nanoparticle (IF-WS₂ NP) filler was fabricated via a simple solution route. A comprehensive investigation by X-ray diffraction, attenuated total reflection-infrared spectroscopy, and differential scanning calorimetry (DSC) showed that 0.5–1 vol% of IF-WS₂ induced a nonpolar α-phase to coexisting triple-phase transition in PVDF, whereas a slightly higher loading of 2 vol% induced pure double-polar β- and γ-phases. These results indicate that the structure and properties of the fabricated nanocomposite are easily tailorable. DSC during heating and cooling cycles and morphology observations further indicated that a polar phase was induced by the nucleation effect of the IF-WS₂ NPs and electrostatic interactions. As a consequence of the multiphase coexistence and structure homogeneity, nanocomposites with approximately 0.5–1 vol% of IF-WS₂ NPs showed enhanced dielectric and energy-storage performance as well as enhanced tensile strength and elongation. The new phase-tailorable nanocomposites with balanced properties are promising for applications as energy-storage capacitors, piezoelectric sensors, and other flexible multifunctional components. The results of this study will serve to deepen the understanding of the polymer polymorph and provide directions on new routes for fabrication of smart materials.

通过简单的溶液法制备了由聚偏二氟乙烯（PVDF）基体和类富勒烯二硫化钨纳米颗粒（IF-WS ₂ NP）组成的新型低成本高介电常数柔性纳米复合材料。通过X射线衍射，衰减全反射红外光谱和差示扫描量热法（DSC）进行的全面研究表明，IF-WS _2的体积百分比为0.5–1导致PVDF中的非极性α相转变为三相共存，而2 vol％的较高负载会诱导纯的双极性β相和γ相。这些结果表明，所制备的纳米复合材料的结构和性能易于调整。DSC在加热和冷却循环以及形态观察中进一步表明，IF-WS ₂ NP的成核作用和静电相互作用诱导了极性相。由于多相共存和结构均匀，纳米复合材料的IF-WS ₂含量约为0.5–1 vol％NP显示出增强的介电和能量存储性能以及增强的拉伸强度和伸长率。具有平衡特性的新型相可定制纳米复合材料有望用作储能电容器，压电传感器和其他柔性多功能组件。这项研究的结果将有助于加深对聚合物多晶型物的理解，并为智能材料制造的新途径提供指导。