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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Crystallization behavior of polymer/montmorillonite nanocomposites. Part III. Polyamide-6/montmorillonite nanocomposites, influence of matrix molecular weight, and of montmorillonite type and concentration
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Crystallization behavior of polymer/montmorillonite nanocomposites. Part III. Polyamide-6/montmorillonite nanocomposites, influence of matrix molecular weight, and of montmorillonite type and concentration

机译：聚合物/蒙脱土纳米复合材料的结晶行为。第三部分聚酰胺6 /蒙脱土纳米复合材料，基质分子量的影响以及蒙脱石的类型和浓度

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摘要

Several series of polyamide-6 (PA-6) nanocomposites, differing in montmorillonite (MMT) type and content and PA-6 matrix molecular weight, were prepared by melt-extrusion and the associated PA-6 crystallization behavior and morphology was evaluated using (synchrotron) Xray diffraction, transmission electron microscopy and differential scanning calorinietry. The nucleating ability of silicate layers is poor in PA-6 nanocomposites made by melt-extrusion because highly active, stable PA-6 crystallization precursors are generated during melt-extrusion. In most of the studied PA-6/MMT nanocomposites the dispersed silicate layers act as impurities and decrease rather than increase the overall crystallization kinetics of PA-6, especially at high MMT contents. Furthermore, at a given MMT concentration, the crystal growth retardation inflates with increasing degree of exfoliation, which dependents on the MMT type and which increases with increasing PA-6 molecular weight. One of the considered MMT types leads to a poorly exfoliatcd nanomorphology and as a result no retardation of crystal growth is observed. furthermore, the disturbed crystal growth does not alter the PA-6 semicrystalline stack morphology. Moderate nucleation effects due to the presence of MMT can be observed when the particle load is low (low amount of MMT and/or poor degree of exfoliation) and provided the supercooling is Sufficiently large. (c) 2006 Elsevier Ltd. All rights reserved.
机译：通过熔融挤出制备了几种系列的蒙脱石（MMT）类型和含量以及PA-6基质分子量不同的聚酰胺6（PA-6）纳米复合材料，并使用（）评价了相关的PA-6结晶行为和形态X射线衍射，透射电子显微镜和差示扫描量热法。在通过熔融挤出制备的PA-6纳米复合材料中，硅酸盐层的成核能力很差，因为在熔融挤出过程中会生成高活性，稳定的PA-6结晶前体。在大多数研究的PA-6 / MMT纳米复合材料中，分散的硅酸盐层起着杂质的作用，并降低而不是提高了PA-6的总体结晶动力学，特别是在高MMT含量下。此外，在给定的MMT浓度下，晶体生长延迟随着剥落程度的增加而膨胀，剥落程度取决于MMT类型，并且随着PA-6分子量的增加而增加。认为的MMT类型之一会导致剥落的纳米形态不佳，结果没有观察到晶体生长的延迟。此外，受扰的晶体生长不会改变PA-6半晶堆叠的形态。当颗粒负荷低（MMT量少和/或剥落程度差）并且过冷度足够大时，可以观察到由于MMT的存在而产生的中等成核作用。 （c）2006 Elsevier Ltd.保留所有权利。

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