乳液插层法制聚合物/蒙脱土纳米复合材料

概述了一种聚合物 /蒙脱土纳米复合材料的新制备方法———乳液插层法。该插层法分为两大类 :聚合物乳液插层和单体乳液插层 ,这两大类又可按各自不同的插层机理进行分类。叙述了蒙脱土和复合材料的结构 ,以及复合材料的一些特性。并对聚合物乳液 /蒙脱土纳米复合材料的插层过程进行了热力学和动力学分析 ,指出将实验室技术产业化是今后发展方向     

插层法制备聚合物/粘土纳米复合材料及其应用进展

概述了聚合物／粘土纳米复合材料插层制备的新进展，根据插层机理和方法的差别，将插层法分为三类：（1）单体插层复合；（2）溶液中聚合物插层复合；（3）熔融聚合物插层复合。重点提出了利用双螺杆挤出机制备聚合物基纳米复合材料的新方法，展望了聚合物／粘土纳米复合材料的开发及其应用前景。     

插层法制备聚合物基纳米复合材料研究进展

聚合物基纳米复合材料具有常规聚合物基复合材料所没有的结构、形态以及较常规聚合物基复合材料具有更优异的力学性能、耐热性能和气体液体阻隔性能等而显示出重要的科学意义和应用前景。本文综述插层法制备聚合物基纳米复合材料近几年的研究进展情况，总结了层状硅酸盐结构、插层剂选择、制备方法等问题。对制备过程进行了热力学和动力学分析，介绍了纳米复合材料表征方法，并对纳米复合材料的性能和应用进行了讨论。     

熔融插层法制备聚合物/层状硅酸盐纳米复合材料的调控因素

综述了熔融插层法制备聚合物／层状硅酸盐纳米复合材料的调控因素，分析了插层过程中复合体系、加工工艺、热力学和动力学因素对聚合物插层与层状硅酸盐片层剥离分散的影响．并展望了聚合物／层状硅酸盐纳米复合材料的研究前景。     

氧化石墨插层纳米复合材料的制备研究进展

氧化石墨（GO）插层纳米复合材料是一种新型的纳米复合材料。介绍了氧化石墨的结构、制备方法和性质；重点论述了聚合物/氧化石墨插层纳米复合材料和无机物/氧化石墨插层纳米复合材料的制备研究进展，介绍了半导体氧化物/氧化石墨插层纳米复合材料。     

溶液插层法制备聚合物/粘土纳米复合材料的研究进展

聚合物/粘土纳米复合材料是当前材料科学的研究热点之一。本文中从工艺和理论方面简述了溶液插层法制备聚合物/粘土纳米复合材料的技术,介绍了溶液插层技术的机理与插层方式,分析了其热力学与动力学原理,阐述了此技术在合成聚合物/粘土纳米复合材料方面的研究现状及技术发展趋势。     

聚合物/高岭土插层复合材料的研究进展

聚合物/高岭土插层复合材料显示出优异的性能,但高岭土特殊的晶层结构则有碍于其与聚合物的插层复合,其复合材料的研究已受到关注。综述了聚合物/高岭土插层纳米复合材料制备方法、液态插层机理和表征技术的研究进展,并展望了其发展前景。     

聚合物／水滑石纳米复合材料制备技术研究进展

水滑石是一种新型的层状无机纳米材料，在聚合物改性方面具有良好的应用。本文对聚合物／水滑石纳米复合材料制备方法，包括水相共沉淀、聚合物溶液插层、聚合物熔融插层和原位插层聚合的技术研究进展进行了综述。     

聚合物/层状硅酸盐纳米复合材料的研究进展

聚合物/层状硅酸盐(PLS)纳米复合材料是一新兴复合材料,具有优异的性能,是当前材料科学的研究热点之一。本文作者首先简要概述了层状硅酸盐的结构及其表面修饰,其中LS的离子交换容量和插层剂的种类是制备PLS纳米复合材料的关键因素之一;然后介绍了PLS纳米复合材料的制备方法、微观结构及其特点,其主要制备方法是插层复合法,包括插层聚合法和聚合物插层法两种;最后展望了PLS纳米复合材料的发展、特性及应用。      

超声波原位插层制备硅树脂/蒙脱土纳米复合材料

采用超声波技术,原位插层聚合法制备了甲基苯基硅树脂/有机蒙脱土(OMMT)纳米复合材料。利用X射线衍射(XRD),透射电镜(TEM)研究了复合材料内部结构以及超声波时间对蒙脱土分散性影响。结果表明,蒙脱土片层间距随着超声波时间延长而增加,当超声波时间短于20min时,有机蒙脱土片层以有序的插层型存在,形成插层型的聚合物/蒙脱土纳米复合材料(PLSN);超声波时间长于30min时,有机蒙脱土片层被剥离,无序地分散在硅树脂基体中,形成剥离型的聚合物/蒙脱土纳米复合材料。     

聚合物/粘土纳米复合材料的插层制备方法

介绍了插层制备聚合物/粘土纳米复合材料的主要方法:剥离-吸附法、原位聚合插层法、熔融插层法和模板合成法;对插层法制备聚合物今后的研究方向提出一些建议.     

成型加工对熔融插层制备聚合物/粘土纳米复合物的影响

对近年来关于熔融插层法制备聚合物/粘土纳米复合物(PCN)过程中成型加工影响作用的研究进展进行了综述。介绍了不同加工设备对制备PCN的不同影响,并指出双螺杆挤出机是进行熔融混合的最合适的加工设备。概述了停留时间、螺杆结构等加工条件和不同成型工艺对制备PCN的不同作用。并对今后的研究提出了展望。     

Polymer Layered Silicate Nanocomposites

Polymer nanocomposites with layered silicates as the inorganic phase (reinforcement) are discussed. The materials design and synthesis rely on the ability of layered silicates to intercalate in the galleries between their layers a wide range of monomers and polymers. Special emphasis is placed on a new, versatile and environmentally benign synthesis approach by polymer melt intercalation. In contrast to in-situ polymerization and solution intercalation, melt intercalation involves mixing the layered silicate with the polymer and heating the mixture above the softening point of the polymer. Compatibility with various polymers is accomplished by derivatizing the silicates with alkyl ammonium cations via an ion exchange reaction. By fine-tuning the surface characteristics nanodispersion (i. e. intercalation or delamination) can be accomplished. The resulting polymer layered silicate (PLS) nanocomposites exhibit properties dramatically different from their more conventional counterparts. For example, PLS nanocomposites can attain a particular degree of stiffness, strength and barrier properties with far less inorganic content than comparable glass- or mineral reinforced polymers and, therefore, they are far lighter in weight. In addition, PLS nanocomposites exhibit significant increase in thermal stability as well as self-extinguishing characteristics. The combination of improved properties, convenient processing and low cost has already led to a few commercial applications with more currently under development.     

聚合物/层状硅酸盐纳米复合材料阻燃性研究进展

根据层状硅酸盐(黏土)可增强聚合物纳米复合材料阻燃性能的研究进展,本文综述了聚合物/层状硅酸盐纳米复合材料的制备方法,指出熔融插层是一种高效可行、环境友好的制备方法;从硅酸盐在纳米复合材料中产生的阻碍效应、自由基诱导效应,网状结构三个方面详细讨论了层状硅酸盐在纳米复合材料中的阻燃机理;最后,指出目前聚合物/层状硅酸盐纳米复合材料在阻燃研究中尚存在的问题,并对其开发应用前景进行了展望。     

熔融插层法制备EPDM/OMMT纳米复合材料研究

采用熔融插层法,通过插层剂优选、配方设计与工艺优化,制备了密封用三元乙丙橡胶/有机蒙脱土(EPDM/OMMT)纳米复合材料,借助XRD分析了其微观结构,利用TG分析了其热稳定性,并初步研究了其气体阻隔性能与相关力学性能.结果表明,EPDM与OMMT经熔融插层形成插层型纳米复合材料,气体阻隔性能得到显著提高,相关力学性能也得以改善.     

Effect of organoclay addition on the two-body abrasive wear characteristics of polyamide 6 nanocomposites

Polymer clay nanocomposites (PCN) exhibit improved mechanical properties due to nanolevel dispersion of clay in the polymer matrix. They also exhibit good tribological performance under dry sliding conditions. Abrasive wear behaviour of these materials would be different from dry sliding behaviour as the mechanisms of the both are entirely different. Hence the abrasive wear behaviour of these materials needs to be investigated. The abrasive wear characteristics of polyamide 6 nanocomposites, with 1, 3 and 5% (wt.) clay prepared by melt intercalation technique, under two-body abrasive wear conditions have been reported. Abrasive wear tests were conducted using a pin-on-disc tribometer containing an abrasive counterface. All the polyamide nanocomposites investigated exhibited a low abrasive wear resistance compared with pristine Nylon. The wear performance of the nanocomposites was correlated with the mechanical properties. Dominant ploughing and cutting wear were observed in polymer clay nanocomposites. The amount of clay present alters the wear mechanism.     

聚合物/粘土纳米复合材料研究进展

聚合物和无机物在纳米尺度上相复合,将使各自的优势得到最充分的体现,聚合物/粘土纳米复合材料的研究已成为高分子材料科学领域的前沿,显示出重要的科学意义和良好的应用前景.本文从制备方法、插层剂的选择、PCN结构、插层理论、性能和应用等方面综述了近年来聚合物/粘土纳米复合材料的研究进展,并对其制备方法提出展望.     

Influence of clay incorporation on the physical properties of polyethylene/Brazilian clay nanocomposites

High density polyethylene/Brazilian clay nanocomposites were prepared by the melt intercalation technique. A montmorillonite sample from Boa Vista/PB, Northeast of Brazil, was organically modified with esthearildimethylammonium chloride (Praepagen WB) quaternary ammonium salt. The unmodified and modified clays with the quaternary ammonium salt were introduced in 1, 2, 3 and 5 wt% in a PE polymer matrix. The dispersion analysis and the interlayer distance of the clay particles were obtained by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The mechanical properties of tensile and the flammability of the nanocomposites were studied. In general, the mechanical properties of the systems presented superior values compared to the matrix. The systems showed a reduction on the burning rate, indicating that the flammability resistance of nanocomposites was improved.