有机化蒙脱土改性聚合物基纳米复合材料的研究进展

有机改性后的蒙脱土,其层间距增大,具有独特的一维纳米层状结构,改善了其与聚合物的相容性,有利于在聚合物中的分散,显著地提高纳米复合材料的力学性能、热稳定性、阻隔性、阻燃性等性能。对蒙脱土的5大类有机插层剂进行了综述,分析了不同插层剂对蒙脱土及蒙脱土/聚合物纳米复合材料的影响。     

新型聚合物季铵盐改性蒙脱土的研究进展

聚合物改性蒙脱土具有比小分子改性更好的热稳定性,更多的结构变化性,聚合物改性蒙脱土可以赋予蒙脱土更多的表面性能和物理机械性能.综述了近年来此领域的最新研究进展,详细介绍了不同聚合物季铵盐、共聚物季铵盐和层间聚合的季铵盐作为改性剂的情况和效果.重点介绍了聚合物有机改性剂的组成、结构、性质及改性后纳米复合材料的性能和应用,并对未来的研究趋势进行展望.     

聚合物／蒙脱土纳米复合材料的研究进展

综述了蒙脱土(MMT)的结构特征、蒙脱土的有机化改性、聚合物/蒙脱土纳米复合材料(PMN)的制备方法以及聚合物/蒙脱土纳米复合材料的结构特性及性能特点。     

硅烷偶联剂接枝改性蒙脱土对PBT性能的影响

选用硅烷偶联剂(KH560)对钠基蒙脱土进行改性。采用熔融共混法制备了不同类型的蒙脱土/聚对苯二甲酸丁二醇酯(PBT)纳米复合材料,通过X射线衍射、透射电镜、动态热力学测试等手段考察了不同类型的蒙脱土对复合材料结构和性能的影响。硅烷偶联剂接枝改性蒙脱土后,蒙脱土/PBT复合材料中蒙脱土层间距从1.26 nm增加到1.42 nm,且蒙脱土在聚合物基体中的团聚现象明显改善。与未改性蒙脱土和商品化有机改性蒙脱土相比较,硅烷偶联剂改性蒙脱土/PBT复合材料的拉伸强度和缺口冲击强度提高。     

纳米蒙脱土有机改性及其在水性聚氨酯中的应用

介绍了纳米蒙脱土的结构、有机化改性剂的种类和有机改性纳米蒙脱土的制备方法;简述水性聚氨酯-蒙脱土纳米复合材料的制备,综述了有机化蒙脱土在改性水性聚氨酯中的应用,并对该类水性聚氨酯涂料的发展趋势和应用前景进行了展望。     

聚乙烯(PE)/OMMT纳米复合材料的结构、形态和性能

选择一种新型的有机改性蒙脱土(OMMT),在不加任何相容剂的条件下,利用熔融挤出法分别制备出了剥离型高密度聚乙烯/蒙脱土纳米复合材料、插层型线型低密度聚乙烯/蒙脱土和低密度聚乙烯/蒙脱土纳米复合材料。利用透射电子显微镜观察制备的复合材料的亚微观分散形态,确定了制备出的纳米复合材料的类型,并对不同亚微观结构形态进行了分析讨论,得出了不同分子结构影响纳米复合材料形成不同分散形态的结论;对于3种纳米复合材料的物理性能测试结果表明,不同亚微观分散形态的纳米复合材料的纳米效应不同,对物理性能的影响各有不同,对于聚合物/蒙脱土纳米复合材料的深入研究具有重大意义,同时分散均匀的纳米复合材料结构对于进一步研究聚乙烯纳米膜的气体阻隔性等性能奠定了良好的基础。     

聚氯乙烯/蒙脱土纳米复合发泡材料的研究

制备了季磷盐改性有机蒙脱土并研究其对聚氯乙烯/蒙脱土纳米复合发泡材料结构和力学性能的影响,XRD、FT-IR、表面接触角等分析测试表明季膦盐改性剂有效实现了对蒙脱土的有机改性。季磷盐改性的钙基蒙脱土能有效改善复合材料的泡孔质量,提高复合材料的力学性能。     

聚丙烯／蒙脱土插层型的纳米复合材料的制备方法

[公开号]1446852[公开日]2003-10-08此发明是一种聚丙烯/蒙脱土纳米复合材料的制备方法。现有技术获得的复合材料性能不令人满意,且工艺复杂。此发明聚丙烯/蒙脱土插层型纳米复合材料的原材料包括:等规聚丙烯、层间距不同的有机改性蒙脱土(TJ1、TJ2、TJ3、TJ4)、接枝改性聚丙烯、接枝改性聚丙烯共聚物。以接枝改性聚丙烯或接枝改性聚丙烯共聚物为改性剂,用母料法熔融插     

改性剂和增容剂在EPDM/蒙脱土纳米复合材料中的作用

采用熔融插层和不同链长的改性荆改性蒙脱土的方法制备了三元乙丙橡胶(EPDM)／蒙脱土(MMT)纳米复合材料。X-射线衍射(XRD)和透射电镜(TEM)的测试结果表明：采用分子中亚甲基的数量小于16的改性剂改性MMT获得的有机蒙脱土与EPDM复合所得到的复合材料为传统型复合材料。而采用分子中亚甲基的数量大于16的改性剂改性MMT获得的有机蒙脱土与EPDM复合所得到的纳米复合材料为插层型。同时，笔者还探讨了EPDM接枝马来酸酐增容剂时复合材料形态的影响以及获得剥离型纳米复合材料的增容剂中马来酸酐的临界接枝率和增容剂最佳含量。此外，时该纳米复合材料的物理机械性能进行了评价。     

聚氨酯/蒙脱土纳米复合材料研究进展

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。     

改性黏土填充PP/PA6复合材料制备与性能研究进展

分别从制备方法,力学性能,流变性能,微观形态和其他性能5个方面综述了近年来有机改性黏土填充PP/PA6复合材料的研究概况,从而得出结论:要提高有机改性黏土填充PP/PA6纳米复合材料的宏观性能,关键在于微观相容性的提高。     

聚合物/蒙脱土纳米复合材料的研究进展

简要概述了聚合物/蒙脱土纳米复合材料的结构及性能,详细介绍了聚酰胺/蒙脱土、聚烯烃/蒙脱土和热固性树脂/蒙脱土纳米复合材料的研究进展。并总结了复合材料的各种优异性能,分析了蒙脱土提高复合材料性能的机理。     

聚酰胺6／蒙脱土与聚酰胺66／蒙脱土纳米复合材料性能比较

将三种不同插层剂改性的蒙脱土与聚酰胺6和聚酰胺66通过熔融共混分别制得纳米复合材料，对其热性能和力学性能进行了研究，对不同插层剂的改性效果和聚酰胺6、聚酰胺66两类纳米复合材料的性能进行了比较。结果显示，所有复合材料的热变形温度、拉伸模量、屈服强度、弯曲模量和弯曲强度均比纯树脂的要高，而断裂伸长率和缺口冲击强度则有所下降；蒙脱士对聚酰胺6的改性效果明显好于对聚酰胺66；三种插层剂中，含羟基的季铵盐改性效果最好，含两个长链烃基的铵盐改性效果最差。     

聚合物/蒙脱土纳米复合材料研究进展

文章简要介绍了蒙脱土的结构,概述了聚合物/蒙脱土纳米蒙脱土材料的结构及性能,详细介绍了聚丙烯(PP)/蒙脱土、聚乙烯(PE)/蒙脱土、环氧树脂(EP)/蒙脱土纳米复合材料国内外最新的研究进展,叙述了聚合物/蒙脱土纳米复合材料优良的力学性能和热学性能。最后对聚合物/蒙脱土纳米复合材料的未来发展做了预测。     

蒙脱土结构特性及在聚合物基纳米复合材料中的应用

对蒙脱土的晶层结构、分散性、流变性及表面修饰进行了系统的评述。蒙脱土片层含有Lewis酸点及过渡金属离子可用于烯类单体的催化聚合反应;自从丰田汽车公司使用尼龙 6／粘土纳米复合材料以来,蒙脱土(具有膨润性的粘土)在聚合物基纳米复合材料中的研究和应用正越来越受到世人的关注。对蒙脱土／聚合物纳米复合材料的制备方法及其进展也进行了综述。     

A conducting nanocomposite via intercalative polymerisation of 2-methylaniline with aniline in montmorillonite cation-exchanged

Polymer/montmorillonite nanocomposites were prepared. Intercalation of 2-methylaniline with aniline monomers into montmorillonite modified by cation was followed by subsequent oxidative polymerization of the monomers in the interlayer spacing. The clay was prepared by cation exchange process between sodium cation in (M-Na) and copper cation (M-Cu). We prepared a series of polymer/clay nanocomposite materials that consisted of an emeraldine base of poly(2-MA), poly(2-MA-co-ANI) and PANI by layered copper montmorillonite. All organic monomers used were first intercalated into the interlayer regions of clay hosts followed by a one-step in situ oxidative polymerization. The unique properties of the as-synthesized nanocomposites materials are investigated by electronic conductivity measurements, X-ray diffraction, FTIR spectroscopy, UV-vis spectroscopy, thermogravimetric analysis and SEM, were also studied by cyclic voltammetry which indicates the electroactive effect of nanocomposite gradually increased with aniline in the polymer chain.     

有机改性蒙脱土研究进展

蒙脱土由于具有独特的层状一维纳米结构,因而具有优良的性能,在基础研究和实际应用中都引起人们普遍的关注.综述了蒙脱土改性方面的研究进展,对有机改性中的阳离子改性、阴离子改性分别进行了介绍,并对蒙脱土改性研究的发展方向提出了自己的观点.     

Poly(methyl methacrylate)/montmorillonite nanocomposites prepared by bulk polymerization and melt compounding

This article focuses on structural, thermal, and mechanical properties of nanocomposites in dependence of preparation method and poly(methyl mathacrylate) (PMMA)/organically modified montmorillonite (OMMT) ratio. PMMA/OMMT nanocomposites were prepared by bulk polymerization and by melt compounding. Properties of nanocomposites of the same composition prepared by the two methods were compared. It was observed that nanocomposites prepared via melt compounding at 200°C had a highly oriented structure with lower interlayer spacing values than nanocomposites prepared via bulk polymerization. Two reasons for the observed smaller interlayer spacing obtained by melt compounding were identified. The first is enhanced PMMA penetration and/or formation between layers in the case of bulk polymerization, which was confirmed by determination of stronger interactions between OMMT and PMMA by Soxhlet extraction, infrared spectroscopy, and differential dynamic calorimery. The second reason for smaller interlayer spacing for nanocomposites prepared by melt compounding is organic modifier degradation during melt compounding process, which was confirmed by thermogravimetric analysis. Both reasons lead to the fracture of melt compounded nanocomposites on the OMMT‐polymer interface, which was observed by scanning electron microscopy. For nanocomposites with disoriented structure and larger interlayer spacing prepared via bulk polymerization the fracture occurred in the polymer matrix. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

The preparation of phenolic resin/montmorillonite nanocomposites by suspension condensation polymerization and their morphology

Phenolic resin/clay nanocomposites were prepared using a suspension condensation polymerization method that was suitable to both novolac and resole. Natural montmorillonite and two kinds of organic modified montmorillonite were adopted to investigate the effect of modification on the final morphology of the nanocomposites. X-ray diffraction (XRD) measurements and Transmission Electron Microscope (TEM) observations showed that clay platelets were easier to be exfoliated or intercalated in novolac than in resole because novolac usually has a linear structure. The modifier with a phenyl ring was more compatible with novolac (or resole) than the aliphatic type modifier. The influence of curing on the morphology was studied as well. An exfoliation-adsorption and in situ condensation mechanism was proposed on the formation of the nanocomposites.