共查询到19条相似文献,搜索用时 62 毫秒
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阐述了近年国际国内在制备聚氨酯(PU)/无机纳米复合材料方面的研究进展情况,针对碳纳米管(CNTs)、石墨烯、氧化物纳米粒子、层状硅酸盐(PLS)等不同种类的无机纳米材料-聚氨酯复合体系研究重点、制备方法及性能特点进行了介绍,并对今后的研究应用方向和趋势做出了展望:将进一步研究无机纳米材料在聚氨酯基体具有更微观层次良好分散性的制备方法;复合材料微观相界面、反应机理方面的理论性研究将更为深入;无机纳米材料选择种类进一步延伸,拓展具有优异综合性能的多元复合体系研究领域;简化复合体系合成途径,降低生产成本,加快聚氨酯复合材料工业化进程。 相似文献
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综述了无机纳米材料复合改性聚氨酯常用的3种合成方法,包括共混法、溶胶-凝胶法、原位聚合法;从机械力学性能、热稳定性能及阻燃性能等几个方面叙述了无机纳米材料复合改性聚氨酯的实验研究情况,改性后的聚氨酯复合材料在拉伸强度、压缩强度等力学性能及热稳定性、阻燃性能均有所提高。最后,对无机纳米材料改性聚氨酯工艺方法的改进进行了展望。 相似文献
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聚氨酯/无机纳米复合材料的应用研究进展 总被引:1,自引:0,他引:1
综述了无机纳米粒子改性聚氨酯复合材料在智能材料、导电材料、光学材料、生物医学材料等领域应用研究的进展,并对聚氨酯/无机纳米复合材料存在的问题和研究方向进行了展望。 相似文献
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纯聚氨酯弹性体(PUE)的耐极性溶剂和耐热性较差,限制了其在某些领域的应用,用纳米无机粒子对其进行改性是提高其性能的一种有效措施。介绍了机械混合法、原位聚合法、插层聚合法几种常用的聚氨酯纳米改性方法及其研究进展。 相似文献
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聚氨酯/蒙脱土纳米复合材料研究进展 总被引:4,自引:0,他引:4
综述聚氨酯/蒙脱土纳米复合材料的国内外研究进展,重点阐述蒙脱土的有机化改性,聚氨酯/蒙脱土纳米复合材料的结构分析表征、制备方法及性能研究,最后介绍聚氨酯/蒙脱土纳米复合材料的最新应用情况。 相似文献
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介绍了水性聚氨酯纳米氧化硅复合材料的优异性能、纳米氧化硅的制备及分散方法、纳米氧化硅水性聚氨酯复合材料的制备方法及测试手段。 相似文献
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A newly developed kind of layered clay, rectorite (REC), has been used to yield intercalated or exfoliated thermoplastic polyurethane rubber (TPUR) nanocomposites by melt‐processing intercalation. Because of the swollen layered structure of REC, similar to that of montmorillonite, organic rectorites (OREC) can also be obtained through ion‐exchange reaction with two different quaternary ammonium salts (QAS1, QAS2) and benzidine (QAS3). The microstructure and dispersibility of OREC layers in TPUR matrix were examined by X‐ray diffraction and transmission electron microscopy, which revealed not only that the composites with lower amounts of clay are intercalation or part exfoliation nanocomposites, but also that the mechanical properties of the composites were substantially enhanced. The maximum ultimate tensile strength for TPUR/OREC nanocomposites appeared at 2 wt % OREC loading. With increasing OREC contents, the tear strength of the composites increased significantly. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 608–614, 2004 相似文献
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综述了医用聚氨酯材料在人工心脏、人造血管、矫形绷带、粘合剂、人工皮肤、药物载体等领域的研究进展,指出今后医用聚氨酯材料的发展方向是可生物降解,具有形状记忆功能,可应用于组织工程,具有高生物相容性和抗菌性等。 相似文献
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聚氨酯/有机蒙脱土纳米复合材料的合成与表征 总被引:6,自引:0,他引:6
采用共沸法精制有机蒙脱土,估算了有机蒙脱土中吸附水质量分数约为8.3%。结构水的质量分数约为4.1%。用两步法原位聚合制备了聚氨酯/有机蒙脱土(PU/MMT)纳米复合材料,表征了纳米复合材料的形态、动态力学性能和物理机械性能。结果表明,有机蒙脱土对聚氨酯有增强和增韧双重作用。有机蒙脱土对聚合物分子的限制作用使PU/MMT纳米复合材料的玻璃化转变温度升高,储能模量和损耗模量也有明显提高。 相似文献
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本文采用溶胶-凝胶法在位制备了不同核壳比(正硅酸乙酯与聚氨酯的质量比)的阳离子型二氧化硅/聚氨酯(S iO2/PU)纳米复合物水分散液;并利用热分析法对不同核壳比的S iO2/PU纳米复合物的相行为进行了研究。结果表明,S iO2纳米粒子的存在和核壳比的增加加大了聚氨酯软、硬段之间的相分离,并对硬段相短程有序结构也有一定的影响。 相似文献
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介绍了无机纳米粒子改性聚氨酯胶粘剂的4种方法;指出了无机纳米粒子改性聚氨酯复合胶粘剂存在的问题和未来的研究方向。 相似文献
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A montmorillonite clay has been modified with two different quaternary ammonium salts, dilauryldimethylammonium bromide (LD) and 4,4-diaminodiphenylmethane (AP), to form the corresponding organophilic clays, LDM and APM. Two series of PU/clay nanocomposite materials, PU/LDM and PU/APM, were then prepared by the reaction of appropriate amounts of PPG, TDI and 1,4 butandiol, followed by addition of the various amounts of LDM or APM. The X-ray diffraction patterns and transmission electron micrographs of the nanocomposites revealed that the modified clay galleries were exfoliated or intercalated in the polyurethane matrix. In comparison with the corresponding pure PU, the results of the TGA and LOI measurements showed that the thermal stability and the flame retardancy of the PU/clay nanocomposites were significantly enhanced due to the presence of the dispersed nanolayers of the organophilic clay in the PU matrix. Using the Tafel method, the results of the electrochemical measurements, which included the corrosion potential, polarization resistance and corrosion current, showed that all the PU/clay nanocomposites, even with low clay loading, in the form of coating on stainless steel disk (SSD) exhibited better corrosion protection over the pure PU. The SSD coated with the composite containing 2 wt% of APM showed the lowest corrosion rate, which was one order lower than that of the SSD coated with the pure PU. 相似文献