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首页> 外文期刊>Journal of Applied Polymer Science >Influence of surface modification on the dispersion of nanoscale alpha-Al2O3 particles in a thermoplastic polyurethane matrix
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Influence of surface modification on the dispersion of nanoscale alpha-Al2O3 particles in a thermoplastic polyurethane matrix

机译：表面改性对热塑性聚氨酯基体中纳米级α-Al2O3颗粒分散的影响

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摘要

In this study, two types of nanoscale alpha-Al2O3 particles were used for preparation of alpha-Al2O3/thermoplastic polyurethane (TPU) composites. These alpha-Al2O3 particles were either coated or uncoated with stearic acid. For the uncoated alpha-Al2O3/TPU composite, the results of field-emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometry indicate that uncoated alpha-Al2O3 particles are significantly aggregated together. This aggregation is due to the poor compatibility between the inorganic filler (alpha-Al2O3) and the organic matrix (TPU). The size of clusters is in the range from 5 to 20 mu m. For the coated alpha-Al2O3/TPU composite, FE-SEM results indicate that most coated alpha-Al2O3 particles are well dispersed in the TPU matrix. This phenomenon results from the effect of surface modifier (i.e., stearic acid) on alpha-Al2O3 particles. Stearic acid can act as a compatibilizer to bridge the boundary between the TPU matrix and the alpha-Al2O3 particle. Stearic acid is not only, a suitable surface modifier for the nanoscale alpha-Al2O3 particle, but also a good dispersant for the dispersion of nanoscale alpha-Al2O3 particles in the TPU matrix. (C) 2008 Wiley Periodicals, Inc.
机译：在这项研究中，两种类型的纳米级α-Al2O3颗粒用于制备α-Al2O3/热塑性聚氨酯（TPU）复合材料。这些α-Al2O3颗粒被硬脂酸涂覆或未涂覆。对于未涂覆的α-Al2O3/ TPU复合材料，场发射扫描电子显微镜（FE-SEM）和能量色散X射线光谱分析的结果表明，未涂覆的α-Al2O3颗粒明显聚集在一起。这种聚集是由于无机填料（α-Al2O3）和有机基质（TPU）之间的相容性差。簇的大小在5至20μm的范围内。对于涂覆的α-Al2O3/ TPU复合材料，FE-SEM结果表明，大多数涂覆的α-Al2O3颗粒都很好地分散在TPU基质中。这种现象是由于表面改性剂（即硬脂酸）对α-Al2O3颗粒的影响所致。硬脂酸可以充当相容剂，以桥接TPU基质和α-Al2O3颗粒之间的边界。硬脂酸不仅是纳米级α-Al2O3颗粒的合适表面改性剂，而且还是纳米级α-Al2O3颗粒在TPU基质中分散的良好分散剂。 （C）2008 Wiley期刊公司

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