【作者】 孙长智；

【导师】 王雁冰；

【作者基本信息】 武汉理工大学 ， 复合材料学， 2011， 硕士

【摘要】 石墨具有优异的导电和导热性能,广泛用于复合材料领域,环氧树脂因具有优异的耐腐蚀性能、粘结性能、高比强度广泛用于树脂基复合材料的基体。石墨/环氧树脂复合材料可以结合二者的优点,但石墨由于与环氧树脂相容性较差,石墨在环氧树脂中分散性较差,需要对石墨进行表面改性。本文采用一种长链有机硅材料AEM5700对石墨进行改性,并与有机硅烷偶联剂KH550改性石墨进行对比。首先采用浓硫酸、浓硝酸将石墨进行氧化,再用KH550和AEM5700对氧化石墨进行表面改性,将改性石墨分散到环氧树脂中,采用浇注成型,制备出具有石墨/环氧树脂复合材料,并研究了石墨/环氧树脂复合材料的力学性能和石墨在环氧树脂中的分散性。实验结果表明：与未改性石墨相比,经硅烷偶联剂KH550改性后,石墨在环氧树脂中的分散性能较好,拉伸强度从84.06 MPa提高到103.55MPa,弯曲强度变化基本未变,压缩模量从4107.00 MPa提高到4330.96 Mpa,断裂延伸率从0.71%提高为0.78%。加入未改性石墨后,环氧树脂粘度由最初的1.583Pa.S增加至1.887 Pa.S(1wt%未改性石墨)和1.934Pa.S(2wt%未改性石墨),经KH550改性后,环氧树脂粘度则降至1.471 Pa.s(1wt%石墨)和1.404 Pa.s(2wt%石墨)。更多还原

【Abstract】 Graphite has excellent conductive and thermal conductivity, widely used in composite material field, epoxy resin for excellent corrosion resistance, bond properties and high specific strength are widely used in polymer matrix composites matrix. Graphite/epoxy resin composite material can combine the advantages of both, but graphite with epoxy resin compatibility is poorer, graphite in epoxy resins dispersivity is bad, need for surface modification of graphite. This paper USES a kind of long chain organic silicone materials of graphite AEM5700 modified, and with organic silane coupling agent KH550 modified graphite were compared. First using sulfuric acid, strong nitric acid oxidation, again will graphite on AEM5700 with KH550 and surface modification of graphite oxide modified graphite scattered, epoxy resins, using pouring shape, the preparation of an graphite/epoxy resin composite material, and studies the graphite/epoxy resin composite material mechanics performance and graphite in the dispersion of epoxy resin.The results shows that:compared with unmodified graphite, modified by KH550 silane coupling agent, epoxy resin dispersion of graphite in better performance, tensile strength increased from 84.06 MPa to 103.55MPa, bending strength did not change the basic changed from 4107.00 MPa compressive modulus increased to 4330.96 Mpa, elongation 71% increase from 0.78%. Unmodified graphite added after the viscosity of epoxy resin from the initial 1.583Pa. S increased to 1.887 Pa. S (1wt% natural graphite) and 1.934Pa. S (2wt% natural graphite), the KH550 modified epoxy resin viscosity is reduced to 1.471 Pa. S (1wt% modified graphite) and 1.404 P. S (2wt% modified graphite).更多还原