共查询到19条相似文献,搜索用时 78 毫秒
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高岭石/N-氧化吡啶插层复合物的制备及其机理分析 总被引:1,自引:0,他引:1
以高岭石/DMSO插层复合物作为前驱体,在微波辐射下成功制备了高岭石/N-氧化吡啶插层复合物,采用X-射线衍射、FT-IR光谱等技术对产物进行表征.实验结果表明:在高岭石/N-氧化吡啶插层复合物中,高岭石的层间距扩张到1.251nm,插层率达到了72.2%.在此基础上,进一步分析N-氧化吡啶插层高岭石的作用机理,即N-氧化吡啶分子中的N-O基团与高岭石的内表面羟基形成了氢键,N-氧化吡啶分子以单分子层形式近似垂直排列于高岭石层间. 相似文献
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高岭石/对硝基苯胺插层复合物的制备与表征 总被引:2,自引:0,他引:2
以高岭石/DMSO作为前驱化合物,甲醇取代DMSO形成高岭石/甲醇插层复合物中间体,再用二次取代法成功制备了高岭石/对硝基苯胺插层复合物,产物用X射线粉晶衍射和傅利叶变换红外光谱进行了表征.高岭石的层间距扩张到1.48nm,插层率达到了81.0%.高岭石/对硝基苯胺插层复合物的红外光谱表明:对硝基苯胺分子中硝基上的氧原子与高岭石的内表面羟基形成氢键;氨基上的氢原子与高岭石的硅氧层面中的氧形成氢键;对硝基苯胺分子可能以单分子层垂直排列于高岭石层间. 相似文献
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以高岭石/二甲亚砜(DMSO)作为前驱体,采用熔融插层法在130℃温度下制备了高岭石/2-吡啶甲酸插层复合物,采用X射线衍射和Fourier变换红外光谱进行了表征.结果表明:高岭石/2-吡啶甲酸插层复合物中,高岭石的层间距由0.72nm扩张到1.409nm,插层率达到84%;在此基础上,分析了2-吡啶甲酸的插层机理,即2-吡啶甲酸分子中羰基与高峰石的内表面羟基形成了氢键,2-吡啶甲酸分子可能以单分子层近似垂直排列与高岭石层间. 相似文献
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将有机化合物插入高岭石层间所形成的高岭石/有机插层复合物是一类新型的矿物材料,兼有粘土矿物和有机物的特性,因而显示出重要的科学意义和应用前景.本文评述了高岭石/有机插层复合物的制备和性能表征,并对其应用前景进行了展望. 相似文献
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采用插层和热处理的方法对高岭石进行剥片。本研究以高岭石/二甲基亚砜插层复合物为前驱体,用"取代法"制备出高岭石/尿素插层复合物,其插层率高达91.23%。将经5h机械磨剥的插层复合物与未经磨剥的插层复合物进行加热处理对比其效果,X-射线衍射(XRD)、红外光谱(FT-IR)、扫描电子显微镜(SEM)、粒径分析和比表面积(BET)结果均表明热处理方法的剥片效果较佳。磨剥后再进行热处理使样品中位径接近1μm,且1μm以下含量超过40%,其剥片效果明显优于直接热处理;且磨剥使得插层复合物热稳定性增强,脱嵌温度升高。 相似文献
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本文采用一种新型的复合方法制备高岭石纳米晶体.采用插层法和超声法相结合对高岭石进行剥片,先用吸潮法制备出高岭石/醋酸钾的插层复合物,再对插层复合物进行超声处理.利用X射线衍射、扫描电子显微镜、透射电子显微镜和电子衍射研究了剥片前后高岭石形状、大小及其结构的变化.实验结果表明,在1小时的超声处理后就已达到明显的剥片效果,BET测试比表面积从8.24m^2/g达到52.29m^2/g;同时处理后的高岭石颗粒保持了完整的晶体结构.另外,超声处理后发现部分高岭石晶体出现了新型纳米棒状结构. 相似文献
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为研究离子液体插层高岭石复合材料的性能,利用三步插层法合成离子液体1-乙基-3-甲基咪唑溴盐/高岭石(K-[Emim]Br)、1-丁基-3-甲基咪唑溴盐/高岭石(K-[Bmim]Br),采用X射线衍射(XRD)、红外光谱(FTIR)、差热分析法(TG-DSC)、扫描电镜(SEM)及紫外吸收光谱(UV)等技术对产物进行表征.结果表明:离子液体分子已经进入到高岭石层间,将片层撑开,增大了层间距,说明其插层成功;离子液体与高岭石内表面羟基形成氢键;离子液体插层后,高岭石的脱羟基温度由492℃分别上升到501和494℃,热稳定性能得到提升;插层复合物的形貌较原始高岭石有了明显改变;复合物在紫外区域具有良好的紫外吸收性能. 相似文献
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Poly(vinyl alcohol)/kaolinite intercalated nanocomposites (Kao-PVA) were prepared via in situ intercalation radical polymerization. Vinyl acetate (VAc) was intercalated into kaolinite by a displacement method using dimethyl sulfoxide/kaolinite (Kao-DMSO) as the intermediate. Then, PVAc/kaolinite (Kao-PVAc) was obtained via radical polymerization with benzoyl peroxide (BPO) as initiator. Last, PVAc/kaolinite was saponified via direct-hydrolysis with NaOH solution in order to obtain PVA/kaolinite nanocomposites, which was characterized by Fourier-Transformation spectroscopy (FTIR), wide X-ray diffraction (WXRD) and transmission electron microscopy (TEM). Their differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results of the obtained PVA/kaolinite suggested that the thermal properties had an obvious improvement. 相似文献
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高岭石/有机插层复合材料的研究进展 总被引:1,自引:0,他引:1
本文从插层剂的选择、插层过程中的热力学分析与影响因素、结构与性能表征等方面对高岭石,有机插层复合材料的研究现状进行了总结,并概述了该领域目前的研究重点及其主要应用前景。 相似文献
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高岭石和甲醇钠溶液反应,在不同的条件下,可以得到具有插层和无定形结构的衍生物。利用XRD、IR和TEM分析了高岭石结构的变化。研究表明:插层结构产物是高岭石由晶体结构向无定形结构转化的过渡态;高岭石和甲醇钠的插层反应是从高岭石的边缘开始的,无定形衍生物中高岭石的层状结构完全被破坏成碎片。 相似文献
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Intercalation of kaolinite under hydrothermal conditions 总被引:4,自引:0,他引:4
R. K. Vempati Visiting Professor M. Y. A. Mollah G. R. Reddy D. L. Cocke Visiting Professor H. V. Lauer Jr 《Journal of Materials Science》1996,31(5):1255-1259
Intercalation of kaolinite with dimethylsulphoxide (DMSO) was carried out under hydrothermal conditions using a Parr bomb. The intercalated complex has been characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR) and thermogravimetric analysis techniques. It was found that the intercalation reaction is completed in 20 min and a high yield, 90%, of kaolinite/DMSO intercalate was obtained. An expansion of the original c-axis spacing of 0.714 nm in kaolinite to 1·124 nm, as a result of incorporation of DMSO molecules into the kaolinite interlayers, has been observed by XRD studies. FT-IR analyses of the intercalated complex have established the nature of interactions between the host structures and the incoming DMSO molecules. The hydrothermal method of intercalation developed in this study can also be used for other systems. 相似文献
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A novel intercalation nanocomposite based on polyacrylonitrile (PAN)/kaolinite was prepared by a simple in situ emulsion polymerization in the presence of organically modified layered silicates (kaolinite). The crude kaolinite (K0) was firstly modified by dimethylsulfoxide-methanol and potassium acetate-aqueous systems; acrylonitrile monomer was then intercalated into kaolinite by displacing potassium acetate from KAc-kaolinite (the kaolinite modified by KAc, marked as K2). The polymer/kaolinite composites were prepared by in situ emulsion polymerization, and characterized by means of X-ray diffraction, scanning electron microscope, transmission electron microscope and thermal gravimetric analysis. Experimental results indicate that the clay layers of kaolinite in PAN/K2 composites are well distributed and delaminated. The weight-average molecular weights were measured by small-angle X-ray scattering for all samples. The presence of clay results in an increase in molecular weights compared to pure PAN polymer due to the highly crosslinked structure. 相似文献
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通过多步交换反应及扩散-聚合的方法,使聚丙烯酸丁酯(PBA)嵌入到改性层状结构的白泥层间,得到白泥-聚丙烯酸丁酯(PBA)纳米复合物的微米级粒子;然后将聚氯乙烯与白泥-聚丙烯酸丁酯进行熔融共混,制得具有一定特性的有机-无机纳米复合材料;并对复合材料的缺口冲击断面形态及流变性能进行了研究。结果表明,复合材料的冲击断面具有明显的网状结构和空洞化特征,属典型的韧性断裂;PVC/白泥-PBA(质量分数0.5%~7.0%)纳米复合材料基本上保持了纯PVC的加工性能。 相似文献