聚合物基纳米复合材料的研究进展

对聚合物基纳米复合材料的研究进展进行了介绍,报道了有关聚合物基纳米复合材料制备方法的研究进展情况,并分别对聚合物/粘土纳米复合材料、环氧树脂基纳米复合材料、聚酯纳米复合材料、聚合物/碳纳米管纳米复合材料的研究发展情况给予了评述,同时对每种体系特点和存在的问题进行了论述,最后着重指出纳米复合材料制备方法、应用以及开发新的聚合物基纳米复合体系是今后的主要研究方向.     

聚合物基纳米复合材料的研究进展

本文综述了近年来聚合物基纳米复合材料的研究进展情况 ,对聚合物基纳米复合材料的各种制备方和已研究的体系及其特点进行了归纳和分析 ,并对聚合物基纳米复合材料的应用前景进行了展望     

聚合物基纳米复合材料的研究进展

综述了近年来聚合物基纳米复合材料的研究进展情况,对聚合物基纳米复合材料的各种制备方法和已研究的体系及其特点进行了归纳和分析,并对聚合物基纳米复合材料的应用前景进行了展望。     

聚合物基纳米复合材料的合成、性质及应用前景

介绍了聚合物 无机纳米复合材料、聚合物 /聚合物纳米复合材料的制备方法、性质、发展方向以及应用前景。对聚合物基纳米复合材料今后的发展提出了一些自己的见解     

聚合物基纳米复合材料的制备研究进展

概述了聚合物基纳米复合材料的制备方法及最新的研究成果,着重介绍了新型纳米材料碳管和石墨烯在制备聚合物基复合材料中的性能特点和应用。针对目前聚合物基纳米复合材料的制备及应用状况,对纳米复合材料未来的发展趋势进行了展望。     

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。     

聚合物基纳米复合材料的合成、性能及应用前景

介绍了聚合物/无机纳米复合材料、聚合物/聚合物纳米复合材料的制备方法、性质、发展方向以及应用前景。对聚合物基纳米复合材料今后的发展提出了一些自己的见解。     

聚合物基有机-无机纳米复合材料研究及应用前景

分别阐述了聚合物基有机－无机纳米复合材料的制备方法，并介绍了不同纳米复合体系的应用现状，最后展望了聚合物基有机－无机纳米复合材料的应用前景。     

结晶聚合物基纳米复合材料多层次结构及有效性能预测

根据结晶聚合物基纳米复合材料实验分析．将结晶聚合物基纳米复合材料内部结构分别用宏观、细观和纳观三个层次来描述。利用数学上的渐近均匀化理论,结合有限元方法,经二次纳观层次的均匀化和一次细观层次的均匀化,预测了聚合物基纳米复合材料的有效性能。并用FORTRAN语言编写了计算程序。具体分析了聚合物的结晶度、聚合物结晶相的弹性模量、纳米颗粒的弹性模量和纳米颗粒的体积分数等参数对结晶聚合物基纳米复合材料有效性能的影响,得到了一些有意义的结论,对指导结晶聚合物基纳米复合材料的制备有一定的指导作用。     

纳米复合薄膜及其在果蔬保鲜中的应用

纳米复合包装薄膜一般为聚合物基纳米复合材料,可分为纳米材料/合成聚合物复合材料与纳米材料/天然聚合物复合材料。阐述了这2种复合材料的制备方法和性能特点,综述了纳米TiO2复合薄膜、纳米SiO2复合薄膜、纳米CaCO3复合薄膜、纳米银复合薄膜在果蔬保鲜中的应用研究,并展望了纳米复合薄膜在果蔬保鲜应用方面的研究方向。     

尼龙6/粘土聚合物纳米复合材料的性能表征——(I)电性能研究

使用Haake-90型双螺杆挤出机制备一系列粘土含量不同的尼龙6/粘土纳米聚合物复合材料,测试其介电常数、介电损耗、介电稳定性能以及电击穿强度,并讨论了粘土含量对纳米复合体系电性能的影响。研究发现,加入纳米粘土后材料的介电常数、介电损耗明显减小,同时介电稳定性能有了大幅度提高,但电击穿强度无明显变化。     

功能性聚合物基纳米复合材料

对聚合物基纳米复合材料研究现状进行了概述，并就其在电、磁、发光性能以及光催化等方面的国内外研究进展进行了全面综述。     

尼龙6/粘土聚合物纳米复合材料的性能表征--(Ⅱ)结晶行为研究

使用Haake-90型双螺杆挤出机制备一系列粘土含量不同的尼龙6/粘土纳米聚合物复合材料,通过X射线衍射和差示扫描量热仪(DSC)研究其结晶行为.X射线衍射结果表明纳米粘土的加入改变了尼龙6的晶型.用修正Avnmi方程的Jeziorny法研究材料的非等温结晶动力学,发现纳米复合材料的半结晶时间t1/2缩短,纳米粘土对尼龙6有明显的异相成核作用.     

TiO2 and SnO2 magnetic nanocomposites: influence of semiconductors and synthetic methods on photoactivity

A number of reports have been published on use of TiO2 in thin films, magnetic nanocomposites, or heterostructures such as TiO2/Ag and TiO2/SnO2, as catalysts for water decontamination. Hence, semiconductor materials such as SnO2, associated with TiO2 in such nanocomposites, should be assessed in depth for such applications, especially those involving complex structures, such as magnetic photocatalytic nanocomposites. The present study describes the synthesis, characterization and testing of the photocatalytic potential of TiO2 or SnO2 magnetic nanocomposites obtained by the polymeric precursor and the hydrolytic sol-gel methods. The nanocomposites TiO2/CoFe2O4 and SnO2/CoFe2O4 were synthesized from polymeric precursors while TiO2/Fe3O4 and SnO2/Fe3O4 were synthesized by the hydrolytic sol-gel method. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (FEG/SEM) and transmission electron microscopy (TEM). The photocatalytic potentials were evaluated by rhodamine B dye photodegradation under UV-C radiation. Compared to SnO2, the nanocomposites with a coating of TiO2 were found to show better photocatalytic activity, but the SnO2 magnetic nanocomposites showed some photocatalytic activity, even though SnO2 is reported to be inactive for these purposes. As for the synthesis method, the nanocomposites obtained from polymeric precursors had smaller surface areas, but higher photocatalytic activity, than those obtained by the hydrolytic sol-gel method. This observation was attributed to the higher crystallinity and a more active surface resulting from calcination of the polymeric precursor material.     

Evaluation of the influence of nanoparticles' shapes on the formation of poly(lactic acid) nanocomposites obtained employing the solution method

PLA nanocomposites were prepared by adding organically modified montmorillonite clay (Viscogel B8) and a homoionic clay (NT25), as well as unmodified silica (A200) and modified organic silica (R972). All nanocomposites were obtained by the solution intercalation method using chloroform as a solvent. The materials obtained were essentially characterized by X-ray diffraction and low-field nuclear magnetic resonance relaxometry, through the measurement of proton spin-lattice relaxation time (LF-NMR). Both clays and silicas used to obtain the polymeric nanocomposites showed good dispersion in the polymeric matrix. The relaxation times were distinct for each type of nanoparticle used. The nanocomposite formed with homoionic clay, NT25, presented an increase in the relaxation data, indicating formation of intercalated nanocomposites, contrary to the action of the organoclay Viscogel B8, which preferentially formed an exfoliated nanocomposite. When unmodified and organo-modified silica were added to PLA, an increase in the relaxation time of the polymer matrix was observed. According to the relaxation data, the organosilica R972 dispersed better in the polymeric matrix and consequently interacted better than the A200.     

聚合物/碳纳米管纳米复合材料性能研究进展

碳纳米管(CNT)可改善聚合物材料的诸多性能,是本世纪最有前景的改性剂之一.文中综述了近5年来,在聚合物/碳纳米管纳米复合材料(PCNC)多项性能(力学、电、热、阻燃、流变等)研究上取得的最新研究进展,讨论了材料中CNT的质量及含量、分散性、定向程度及表面化学改性(官能化)等因素与材料性能间的关系,还探讨了这类材料具有...     

聚合物／POSS纳米复合材料热性能增强机理研究进展

笼型倍半硅氧烷(POSS)是由Si-O-Si键组成的无机核、顶点处连接有机取代基团的大小0.5nm~3 nm结构规整的新型纳米分子,具有高的热稳定性。文中就聚合物/POSS纳米复合材料热性能的影响因素进行综述,讨论了各种热性能增强机理的研究进展。     

Investigation of the deformation and failure mechanism of organo-montmorillonite filled PP–TPO nanocomposites under uniaxial tension

Many applications of nanocomposites based on polymeric systems have been developed for some time. However, the mechanisms of failure as well as fracture toughness of nanocomposites are yet to be completely understood. In this study, the clustering of nanoparticles, specifically, the effect of the number of clusters and their sizes on the fracture behavior of polypropylene (PP) and thermoplastic olefin (TPO) nano-composites is investigated. The effect of injection-molding flow profiles is also discussed with respect to the filler morphology and its effect on the tensile fracture toughness. Morphological analysis of the nanoparticle distribution is performed through fractographic analysis, and the contribution of nanoparticle clustering to the micromechanisms of fracture is discussed.