聚合物纳米复合材料(PNCs)的流变性能与机理研究,主要关注非极性聚合物基体,但很少在强烈的极地上。为了填补这个空白,研究了纳米填料对聚偏氟乙烯(PVDF)流变性能的影响。颗粒直径和含量对微观结构的影响,流变学,结晶,并对PVDF/SiO2的力学性能进行了分析,TEM,DLS,DMA,DSC。结果表明,纳米粒子可以大大降低PVDF的缠结度和粘度(高达76%),不影响基质的氢键,这可以用选择性吸附理论来解释。此外,均匀分散的纳米粒子可以促进PVDF的结晶和力学性能。总之,纳米粒子对非极性聚合物的粘度调节机理,也适用于PVDF,具有强烈的极性,这对于探索PNCs的流变行为和指导聚合物的加工工艺具有重要价值。
Research on the rheological performance and mechanism of polymer nanocomposites (PNCs), mainly focuses on non-polar polymer matrices, but rarely on strongly polar ones. To fill this gap, this paper explores the influence of nanofillers on the rheological properties of poly (vinylidene difluoride) (PVDF). The effects of particle diameter and content on the microstructure, rheology, crystallization, and mechanical properties of PVDF/SiO2 were analyzed, by TEM, DLS, DMA, and DSC. The results show that nanoparticles can greatly reduce the entanglement degree and viscosity of PVDF (up to 76%), without affecting the hydrogen bonds of the matrix, which can be explained by selective adsorption theory. Moreover, uniformly dispersed nanoparticles can promote the crystallization and mechanical properties of PVDF. In summary, the viscosity regulation mechanism of nanoparticles for non-polar polymers, is also applicable to PVDF, with strong polarity, which is of great value for exploring the rheological behavior of PNCs and guiding the process of polymers.