A comparative analysis of crystallization behavior induced by several mineral fillers in polypropylene nanocomposites was performed. Morphological changes and thermal properties of nanocomposites were evaluated, considering the influence of shape, crystalline morphology, and concentration of mineral particles. For this study, hydrated magnesium silicates with different particle morphologies, such as platelets (talc) and fibers (sepiolite), were used for nanocomposites. In addition, to analyze the effect of mineral crystallinity on nanocomposites, talc and sepiolite from different origin and genesis were selected. Nanocomposites were compounded and injection molded, using different filler concentration (0, 1, and 3% w/w) for each mineral particle. To evaluate the particle influence on nanocomposite crystallinity, X-ray diffraction was used to determine crystalline phases and crystal orientation, meanwhile differential scanning calorimetry was performed to obtain thermal properties. Main results revealed that talc has a higher nucleating effect on polypropylene matrix than sepiolite fibers, regardless of their origin and genesis. Meanwhile, a transcrystalline layer that surrounds the fiber surface is observed for nanocomposite containing sepiolite. Moreover, Argentinean talc induces different crystalline phases in nanocomposite with respect to Australian one, which partly influences on mechanical properties.

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聚丙烯纳米复合材料中不同矿物填料诱导结晶行为的对比分析

对聚丙烯纳米复合材料中几种矿物填料诱导的结晶行为进行了比较分析。考虑到形状、结晶形态和矿物颗粒浓度的影响，评估了纳米复合材料的形态变化和热性能。在这项研究中，具有不同颗粒形态的水合硅酸镁，如片状（滑石）和纤维（海泡石），被用于纳米复合材料。此外，为了分析矿物结晶度对纳米复合材料的影响，选择了不同来源和成因的滑石和海泡石。纳米复合材料经过复合和注塑成型，每种矿物颗粒使用不同的填料浓度（0、1 和 3% w/w）。为了评估颗粒对纳米复合材料结晶度的影响，X射线衍射用于确定晶相和晶体取向，同时进行差示扫描量热法以获得热性能。主要结果表明，与海泡石纤维相比，滑石粉对聚丙烯基体具有更高的成核作用，无论其来源和成因如何。同时，对于含有海泡石的纳米复合材料，观察到围绕纤维表面的跨晶层。此外，阿根廷滑石在纳米复合材料中诱导出与澳大利亚滑石不同的结晶相，这在一定程度上影响了机械性能。不管他们的起源和起源。同时，对于含有海泡石的纳米复合材料，观察到围绕纤维表面的跨晶层。此外，阿根廷滑石在纳米复合材料中诱导出与澳大利亚滑石不同的结晶相，这在一定程度上影响了机械性能。不管他们的起源和起源。同时，对于含有海泡石的纳米复合材料，观察到围绕纤维表面的跨晶层。此外，阿根廷滑石在纳米复合材料中诱导出与澳大利亚滑石不同的结晶相，这在一定程度上影响了机械性能。