共查询到19条相似文献,搜索用时 78 毫秒
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以逾渗理论、隧道效应理论和场致发射效应理论为例分析介绍了填充复合型导电高分子材料的导电机理;以炭黑、碳纳米管、石墨烯填充环氧树脂复合材料为例,综述了影响复合材料导电性能的主要因素,并重点介绍了相关研究人员在改善碳系材料分散性、降低复合材料渗流阙值等方面的研究进展。 相似文献
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Chi-Hao Chang Tsao-Cheng Huang Chih-Wei Peng Tzu-Chun Yeh Hsin-I Lu Wei-I Hung Chang-Jian Weng Ta-I Yang Jui-Ming Yeh 《Carbon》2012,50(14):5044-5051
We report on the exceptional application of polyaniline/graphene composites (PAGCs) for corrosion protection of steel. The composites display outstanding barrier properties against O2 and H2O compared with neat polyaniline and polyaniline/clay composites (PACCs). The conductive filler, 4-aminobenzoyl group-functionalized graphene-like sheets (ABF-G) with a relatively higher aspect ratio than organophilic clay nonconductive fillers, is a versatile platform for polymer grafting that promotes better dispersion of the graphite within the polymer matrix and lengthens the diffusion pathway that gases should effectively encounter. This concept can be used for other polymer/graphene composites. 相似文献
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《Carbon》2013
A simple method to prepare thermally reduced graphene oxide/polymer composites was developed to enhance the electrical conductivity of the polymer. Graphene oxide sheets were coated onto the surfaces of poly(vinylidene fluoride) powders and then hot pressed at 200 °C to form composites with a segregated structure. After hot-pressing, the thermally reduced graphene oxide sheets were located in the interstices among the polymer domains and formed a two-dimensional conductive network. The resulting composites exhibited excellent electrical conductivity and a low percolation threshold (0.105 vol.%). 相似文献
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Ahmed S. Wajid Sriya Das Fahmida Irin H.S. Tanvir Ahmed John L. Shelburne Dorsa Parviz Robert J. Fullerton Alan F. Jankowski Ronald C. Hedden Micah J. Green 《Carbon》2012,50(2):526-534
We demonstrate a simple and effective technique for dispersing pristine (unfunctionalized) graphene at high concentrations in a wide range of organic solvents by use of a stabilizing polymer (polyvinylpyrrolidone, PVP). These polymer-stabilized graphene dispersions are shown to be highly stable and readily redispersible even after freeze-drying. This technique yields significantly higher graphene concentrations compared to prior studies. An excellent increase in the thermal conductivity of the fluid by the addition of pristine graphene is also demonstrated. These well-dispersed pristine graphene sheets were then used as a strong and conductive nano-filler for polymer composites. Graphene/PVP composites were produced by the bulk polymerization of N-vinylpyrrolidone loaded with dispersed graphene, resulting in excellent load transfer and improved mechanical and electrical properties. 相似文献
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Yanbin Wang Qingning Kong Huang Yu Zhonglin Luo Biaobing Wang 《Polymer-Plastics Technology and Engineering》2021,60(2):195-207
ABSTRACT Flexible conductive polymer composites with good mechanical property play an important role in the modern electronic industry. In this study, aromatic poly(amide-imide) (PAI) and thermoplastic polyurethane (TPU), functionalized multi-wall carbon nanotube (FMWCNT) and reduced graphene oxide (RGO), were, respectively, used as polymer matrix and conductive filler to fabricate conductive polymer composites. Combing the advantages of PAI (high strength) and TPU (good elasticity), PAI-TPU/FMWCNT-RGO polymer composites exhibited a high tensile strength of 58.8 MPa and good elongation at break of 255%. On the other hand, the hybrid conductive filler of FMWCNT-RGO possessed a 3D structure, which is beneficial for improving conductive property, and thus a relative high conductivity of 35.9 S m?1 was achieved. The enhanced mechanical and conductive properties are mainly ascribed from the good compatibility between the polymer matrix and conductive fillers, which promotes the good dispersion of conductive filler into the polymer matrixes. 相似文献
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氧化石墨烯(GO)具有较高的比表面积,层间距大,表面拥有丰富的官能团,可以很好地分散到聚合物中,但GO导电性差。研究对GO进行还原和表面修饰,以改善石墨烯和HDPE的相容性。采用熔融混炼法制备了HDPE/石墨烯复合材料,结合力学性能、导电性能、微观结构测试,考察不同HDPE/石墨烯复合材料的导电阈值,分析影响复合材料导电性的因素,进而得出较优化的制备工艺。研究发现石墨烯添加量为7.5%时,导电通路开始形成,当石墨烯含量达到7.5%时,拉伸强度提升22.14%,拉伸模量提升21.19%。 相似文献
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P. Fabbri L. Valentini S. Bittolo Bon D. Foix L. Pasquali M. Montecchi M. Sangermano 《Polymer》2012,53(26):6039-6044
The preparation of electrically conductive acrylic resins containing reduced graphene oxide (rGO) by photopolymerization is presented. The synthesis consists of a single-step procedure starting from a homogeneous water dispersion of GO, which undergoes reduction induced by the UV radiation during the photopolymerization of an acrylic resin. The role played by the amount of radical photoinitiator added to the resin has been evaluated in relation to the in-situ reduction of GO, that was monitored by X-ray photoelectron spectroscopy. Results show that the UV-induced photopolymerization of acrylic resins with added GO gives rise to conductive acrylic composites thanks to the simultaneous reduction of GO to rGO and crosslinking of the resin. On this basis UV-induced photopolymerization is proposed as a sustainable strategy for the production of conductive graphene/polymer composites. 相似文献
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Preparation of graphene nanosheet/polymer composites using in situ reduction-extractive dispersion 总被引:3,自引:0,他引:3
Graphene nanosheet/polymer composites were prepared using in situ reduction-extractive dispersion technology. The morphology and microstructure of the composites were examined by scanning electron and optical microscopy. The results indicate that graphene nanosheets from the reduction of graphite oxide are about 5 nm thick and 1-3 μm in diameter. Reduction-extractive dispersion technology can effectively promote the dispersion of graphene nanosheets and consequently an excellent conductive network is formed in the matrix. The percolation threshold of the composite is about 0.15 vol.%. When the graphene nanosheet content is lower than 1.5 vol.%, the conductivity of the composites is 3-5 orders of magnitude higher than that of composites filled with graphite nanosheets from expanded graphite. 相似文献
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Hongliang Hu Guo Zhang Liguang Xiao Hongjie Wang Qiushi Zhang Zhudi Zhao 《Carbon》2012,50(12):4596-4599
Graphene-coated ultrahigh molecular weight polyethylene (UHMWPE) powders were prepared by a two-step process. The first step is to coat UHMWPE polymers with graphene oxide (GO) sheets. The second step is to reduce GO on the powders to graphene. The two-step process can effectively prevent the aggregation of graphene during reduction. The resultant graphene/UHMWPE mixtures were hot pressed at 200 °C to obtain the composites with a segregated structure. The composites exhibit high electrical conductivity at a very low percolation threshold (0.028 vol.%). Our method provides a new route for preparing electrical conductive graphene/polymer composites with low percolation threshold. 相似文献