Preparation of Intercalated Clay/Phenolic Resin Nanocomposites under High Pressure

High pressure method was ased for the first time to produce rectorite clay （REC）/phenolic resin （PF） and organic rectorite clay （OREC） /phenolic resin and montmorillonite（ MMT）lphenolic resin （PF） nanocomposites. The structure of the material phase was studied by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Fourier transform infrared （ FT- IR ） spectroscopy, thermogravimetric analysis （ TGA ）, and atomic force microscopg＂ （AFM）. The experimental results show that intercalated clay/resin nanocomposites could form under normal temperature and high pressure conditions by the intercalation of polymeric molecules rather than interlayer polymerization.     

PE/PEMA/MMT纳米复合材料的制备与性能

采用熔融插层法制备了聚乙烯／马来酸酐接枝聚乙烯／蒙脱土(PE／PEMA／MMT)纳米复合材料,研究了不同质量分数的蒙脱土对聚乙烯力学性能、热稳定性能及对有机溶剂的阻隔性的影响,并用X射线衍射法对材料的微观结构进行了表征．结果表明,聚乙烯分子链已插层进入蒙脱土层间,材料的拉伸强度最大提高了13．5％,热分解温度有一定程度的提高,材料对有机溶剂的阻隔性也有所改善、     

聚合物/粘土纳米复合材料研究进展

概述了近年来聚合物 /粘土纳米复合材料的研究进展 ,根据插层机理和方法的差别 ,将插层法分为 3类 :(1)单体原位插层复合 ;(2 )溶液中聚合物插层复合 ;(3)熔融聚合物插层复合。提出了利用双螺杆挤出机熔融挤出制备聚合物 /粘土纳米复合材料的新方法。并总结了聚合物 /粘土纳米复合材料的性能开发及应用前景。     

Clay-polymer Nanocomposites： Preparation, Properties, FutureApplications and New Synthesis Approach of EPDM／clay Nanocomposites

The synthetic routes, materials properties and future applications of clay-polymer nanocomposites are reviewed. Nannocomposites are composite materials that contain particles in the size rang 1-100 nm. The particles generally have a high aspect ratio and a layered structure that maximizes bonding between the polymer and particle. Adding a small quantity of these additives (0.5%—5% ) can increase many of the properties of poly-mer materials, such as tensile characteristics, heat distortion temperature, scratch resistance, gas permeability resistance, and flame retardancy. This new type of materials may be prepared via various synthetic routes comprising exfoliation adsorption, in-situ intercalative polymerization and melt intercalation. In this paper we report the new method for preparation EPDM-clay nanocomposites. The EPDM-clay nanocomposites were prepared by using two different approaches ( direct and indirect). It is found that there is no difference between both methods but the direct method is easier, its cost is lower and industrially more practical. X-ray diffraction (XRD)and transmission electron microscopy (TEM) results showed a exfoliation structure. The mechanical properties of these nanocomposites significantly improved.     

EVA插层复合材料的取向结构对阻燃性能的影响

利用蒙脱土(MMT)特殊的片层结构,采用挤出工艺、熔融插层法制备了乙烯醋酸乙烯脂/蒙脱土(EVA/MMT)和乙烯醋酸乙烯脂/有机蒙脱土(EVA/OMMT)纳米复合材料,用锥形量热仪测试并分析了材料的燃烧性能。结果表明,添加OMMT的复合材料具有阻燃作用;复合材料中蒙脱土片层的(横、纵)取向影响材料的阻燃性;横向取向的EVA/OMMT复合材料有更低的热释放速率和质量损失速率,具有较好的阻燃性。通过扫描电镜(SEM)表征不同取向材料燃烧后炭渣的形貌,表明形成的炭层也为横、纵取向,解释了插层复合材料的横、纵取向对材料阻燃性的影响。     

有机蒙脱土/SBS改性沥青的制备与性能研究

采用熔融插层法制备了有机蒙脱土(OMMT)/SBS改性沥青,利用XRD和荧光显微镜表征了OMMT/SBS改性沥青的微观结构,研究了OMMT对SBS改性沥青物理性能和老化性能的影响。结果表明:OMMT与SBS改性沥青形成了剥离型纳米复合结构,并且OMMT可起到交联中心的作用,有利于SBS交联网络在沥青中的形成;OMMT可有效提高SBS改性沥青的粘度和软化点。与SBS改性沥青相比,在PAV老化后,OMMT/SBS改性沥青粘度增加率小、残留针入度比高,表现出优良的耐老化性能。     

PP/PS-海泡石纳米复合材料的热性能及结构形态

采用CTAB对海泡石有机化处理并通过苯乙烯乳液聚合进行原位插层,将插层产物与聚丙烯熔融共混制备PP/PS原位插层海泡石纳米复合材料.用XRD、DSC、SEM等测试手段研究了复合材料的结构与性能.XRD测试发现,乳液聚合后海泡石层间距明显增大,说明CTAB和聚苯乙烯对海泡石有剥离作用,复合材料为插层型复合材料.DSC结果...     

Modification of Nanocomposites by Melting Intercalation of Polypropylene in Montmorillonite

The polypropylene was modified by ultraviolet irradiation.The polypropylene-montmorillonite nanoicomposites were prepared by direct melting intercalation of polypropylene powders.The structure of polypropylene,the polyproprlene irradiated,montmorllinote and polypropylene-montmorillonite composites were studied by XRD,IR and DSC.The results show that the PP molecules can are oxidized during ultraviolet irradiation,melt polypropylene can intercalate into montmorillonite layer .As a result,the layered distance(d001) of montmoril-lonite increases,and the melt absorption peak of polypropylene in layer is eliminated.     

高岭石插层复合物与纳米高岭石研究现状与展望

某些有机分子可进入高岭石层间形成有机插层复合物,基于高岭石有机插层复合物的功能性材料受到人们的广泛关注并成为当前应用矿物学的研究热点之一。本文介绍了高岭石有机插层复合物与纳米高岭石的研究历史和现状,阐述了高岭石有机插层复合物制备的主要影响因素、插层机理、表征、研究方法以及基于高岭石有机插层作用的纳米高岭石制备,同时对此领域今后的研究方向进行了展望。     

有机化蒙脱土对SBS改性沥青热氧老化性能的影响

将有机化蒙脱土(OMMT)与SBS改性沥青熔融共混,制备了OMMT/SBS改性沥青。利用X-射线衍射(XRD)分析了OMMT/SBS改性沥青的微观结构。通过长期热氧老化实验研究了OMMT对SBS改性沥青热氧老化行为的影响。XRD分析表明,OMMT/SBS改性沥青形成了剥离型纳米复合结构。热氧老化试验结果显示,OMMT可显著减少SBS改性沥青软化点和粘度的增加,提高其残留延度比和残留针入度比,明显改善了SBS改性沥青耐热氧老化性能。     

聚丙烯/聚丙烯接枝丙烯酸/蒙脱土纳米复合材料的制备及性能

用悬浮接枝法制备了接枝率为2 2%的聚丙烯接枝丙烯酸作为相容剂,用十六烷基三甲基溴化铵对钠基蒙脱土进行了有机化处理,使蒙脱土的层间距从1 2nm增加到了3 84nm。通过熔融插层法制备了插层型聚丙烯/蒙脱土纳米复合材料(Polypropylene/MontmorilloniteNanocomposites,PNC),复合材料中蒙脱土层间距比有机蒙脱土的层间距又有小幅度的增加。当蒙脱土含量为2%,相容剂用量为15%时的复合材料力学性能最好,缺口冲击强度和拉伸强度分别达到12 12kJ/m2和35 77MPa,分别比纯1PP增加了180%和4 3%,蒙脱土的加入起到了增韧和增强的双重作用。     

蒙脱土/SBS纳米复合材料研究

介绍了蒙脱土/SBS纳米复合材料的研究现状,简述了蒙脱土的结构特征和表面有机修饰,探讨了蒙脱土/SBS纳米复合材料的制备方法,即熔融插层法和溶液插层法等,并指出了进一步研究的方向.     

STUDY OF COMPOSITE BY MELTING INTERCALATION OF POLYACRYLAMIDE IN MONTMORILLONITE

The synthesis of polyacrylamide (PAM)-momtmorillinote cmposite by direct melting intercalation ofpolymer powders is studied using XRD, IR and DSC.The results show that melt PAM can intercalate into mont-morillonite layer. The layered distance(d_(001))of montmoril-lonite increases, and the melt absorption peak of PAM inlayer has eliminated.     

HIPS插层复合材料的结构与阻燃性的关系

根据蒙脱土(MMT)特殊的片层结构,采用熔融插层法制备了HIPS/MMT及HIPS/OMMT复合材料,并用锥形量热仪对材料的燃烧性能进行测试。结果表明,材料中蒙脱土片层的取向影响材料的阻燃性;与竖直取向的HIPS/OMMT复合材料相比,水平取向的HIPS/OMMT复合材料有更低的热释放速率和质量损失速率,具有较高的阻燃性。用扫描电镜表征了不同取向材料燃烧后炭层的形貌,表明形成的炭层也具有横、竖取向。此现象解释了插层复合材料的取向影响材料的阻燃性,为聚合物/层状硅酸盐纳米复合材料阻燃机理的研究提供了依据。     

有机化累托石改性沥青的制备及性能研究

采用熔融插层法制备了有机化累托石(OREC)改性沥青,利用X射线衍射(XRD)表征了OREC改性沥青的微观结构,研究了OREC用量对改性沥青物理性能和粘度的影响,并通过薄膜烘箱(TFOT)和压力老化(PAV)对基质沥青和改性沥青老化性能进行了比较。结果表明:OREC可与沥青熔融插层形成剥离型纳米复合结构;OREC与沥青熔融共混后,沥青的软化点和粘度均增大;与普通沥青相比,经TFOT和PAV老化后,OREC改性沥青的软化点增量和粘度增加率显著减小,表明OREC可有效改善沥青耐老化性能。     

功能化氧化石墨/聚羟基丁酸酯纳米复合材料的制备与性能研究

采用溶液插层技术制备功能化氧化石墨/聚羟基丁酸酯纳米复合材料(MGO/PHB),利用红外光谱分析(FTIR)和原子力显微镜(AFM)对MGO的表面结构进行表征,并用扫描电子显微镜(SEM)、X射线衍射(XRD)、示差扫描量热仪(DSC)及拉伸试验分别对MGO/PHB的微观形貌、结晶性能及力学性能进行分析测试。结果表明:MGO的加入加速了PHB基体的结晶并导致结晶度增大;氧化石墨经表面功能化处理后,改善了MGO片在PHB基体中的均匀分散以及其与PHB基体的界面相互作用;随着MGO质量分数的增加,复合材料的断裂强度先降低后增大,而与纯PHB相比,复合材料都表现出更高的断裂模量值,但复合材料的力学性能变化与MGO添加量的阀值有一定关系。     

Intercalation of Amido Cationic Drug with Montmorillonite

The intercalation of drug molecules with montmorillonit （MMT） using Acyclovir （ACV） as the model drug was focused on. The optimum conditions were studied based on orthogonal design, such as intercalation time and temperature. The intercalation composites were characterized by X-ray diffraction （XRD）, Fourier transformed infrared （FT-IR）, and thermogravimetric analysis （TGA）. The experimental results reveal that ACV is successfully intercalated into the interlayers of MMT, The in vitro release experiments reveal that ACV is released from MMT steadily and pH dependent.     

配位插层聚合制备膨润土/聚丙烯酰胺调湿材料

通过离子交换反应先将钙基膨润土交换成钠基膨润土，继而交换成镍基膨润土，然后将丙烯酰胺配位插层进入镍基膨润土层间，于353K条件下使用硝酸铈铵作引发剂，使丙烯酰胺在膨润土中配位插层聚合5h制备出一种新型的聚丙烯酰胺／膨润土复合调湿材料。XRD分析结果表明，丙烯酰胺于338K条件下在膨润土中配位插层12h后，镍基膨润土的层间距从1．607nm增至2．079nm；同时，还通过IR分析对钙基膨润土和聚丙烯酰胺／膨润土复合物进行了表征。通过对不同膨润土含量的调湿材料调湿性能的测试表明：随着复合物中膨润土含量的增加，复合物的吸湿量和吸湿速率降低，放湿速率增加。     

乳液法制备氯丁橡胶/蛭石纳米复合材料的研究

针对氯丁橡胶改性方法工艺繁琐、改性效果差、溶剂的引人使其阻燃性能差等问题,提出在乳液体系中,采用单体原位插层聚合法,使2-氯-1,3-丁二烯与未有机化蛭石进行反应,制备剥离型氯丁橡胶/蛭石纳米复合材料,以改善氯丁橡胶的力学性能、阻燃性能及抗静电性能,扩大了氯丁橡胶的应用范围.     

Fluxing Agents on Ceramification of Composites of MgO-Al_2O_3-SiO_2/Boron Phenolic Resin

Fluxing agents of zinc borate, antimony oxide, galss frit A and glass frit B, with different melting or softening point temperatures, were added into MgO-Al_2O_3-SiO_2/boron phenol formaldehyde resin(MAS/BPF) composites to lower the formation temperature of eutectic liquid phase and promote the ceramification of ceramifiable composites. The effects of fluxing agents on the thermogravimetric properties, phase evolution, and microstructure evolution of MAS/BPF composites were characterized by TG-DSC, XRD and SEM analyses. The results reveal that the addition of a fluxing agent highly reduces the decomposition rate of MAS/BPF composites. Fluxing agents lower the formation temperatures of liquid phases of ceramifiable MAS/BPF composites obviously, and then promote the ceramification and densification process. The final residues of composites are ceramic surrounded by large amount of glass phases.