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首页> 外文期刊>Polymers for advanced technologies >PA66/PA12/clay based nanocomposites: morphology and physical properties
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PA66/PA12/clay based nanocomposites: morphology and physical properties

机译：PA66 / PA12 /粘土基纳米复合材料：形态和物理性质

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摘要

The structure and the physical properties of several polyamide 66 (PA66)/polyamide 12 (PA12) blends containing different amounts of the two polymers and obtained by melt-blending have been investigated. A low amount of organically-modified layered silicate (OMLS, 4 wt%) has also been introduced in order to further improve the physical properties and, in particular, to evaluate its effect on the blends' structure and components' miscibility. The microstructure and morphology of all the composites were analyzed by means of X-Ray diffraction (WAXD), transmission electron microscopy (TEM), and high resolution scanning electron microscopy (SEM), while the macroscopic scale properties (mechanical behavior and water adsorption) were assessed in order to investigate and understand the materials' structure-properties relationships. The partial miscibility of PA66 and PA12, with phase separation depending on blend composition, has been confirmed. The results also underlined the possibility to tailor the behavior of polymer blends in terms of mechanical water adsorption properties by varying the amount of PA12, added to PA66 with and without the addition of the OLMS. The effectiveness of the clay in modifying the components' miscibility as well as its tendency to segregate preferentially within separate PA66 domains have been assessed. WAXD results showed opposite effects of PA12 and clay on the crystallization behavior of PA66, an aspect that has also been deepened in another paper by the same authors discussing the results of the complete thermal characterization.
机译：已经研究了几种聚酰胺66（PA66）/聚酰胺12（PA12）共混物的结构和物理性能，这些共混物包含不同量的两种聚合物并通过熔融共混获得。为了进一步改善物理性能，特别是评估其对共混物的结构和组分的可混溶性的影响，还引入了少量的有机改性层状硅酸盐（OMLS，4 wt％）。通过X射线衍射（WAXD），透射电子显微镜（TEM）和高分辨率扫描电子显微镜（SEM）分析了所有复合材料的微观结构和形貌，而宏观尺度特性（机械性能和吸水率）为了调查和了解材料的结构-特性关系而进行了评估。证实了PA66和PA12的部分混溶性，其相分离取决于共混物的组成。结果还强调了通过改变添加或不添加OLMS的PA12的量（根据机械吸水性能）来调整聚合物共混物性能的可能性。评估了粘土在改变组分的可混溶性方面的有效性及其在单独的PA66域内优先偏析的趋势。 WAXD结果显示PA12和粘土对PA66结晶行为的相反作用，同一作者在讨论完整热表征结果的另一篇论文中也深化了这一方面。

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