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利用有机纳米累托石对聚脲弹性体进行改性,制备了粘土/聚脲纳米复合材料,采用红外光谱(FTIR)分析了改性体系的结构变化,X-射线衍射(XRD)和透射电镜(TEM)分析了粘土在纳米复合材料中的解离情况,研究了有机累托石添加量对聚脲性能的影响。结果表明,有机累托石以物理共混的形式分散在聚脲中,聚脲可以插入粘土层间,使层间距变大;纳米复合材料在有机累托石添加量为5wt%时具有较优的综合性能,拉伸强度和断裂延伸率分别提高了72.9%和8.7%,初始分解温度提高了19.7℃,500℃时重量保持率提高了7.6%。
The clay / polyurea nanocomposites were prepared by organic nanocomposite modified polyurea elastomer. The structure of the modified system was analyzed by Fourier transform infrared spectroscopy (FTIR). X-ray diffraction (XRD) and transmission electron microscopy (TEM) was used to analyze the dissociation of clay in nanocomposites. The effects of the amount of organic rectorite on the properties of polyurea were investigated. The results showed that the organic rectorite dispersed in the form of physical blending polyurea, polyurea can be inserted between the clay layers, so that the spacing between the layers becomes larger; nanocomposites with the organic rectorite added amount of 5wt% has better The tensile strength and elongation at break increased by 72.9% and 8.7%, respectively. The initial decomposition temperature increased by 19.7 ℃ and the weight retention rate increased by 7.6% at 500 ℃.