石墨/环氧树脂复合材料的制备及性能研究
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)。
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).
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)。
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).
引文
[1].#12
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[4].王军,刘文彬,王超等.环氧树脂胶黏剂在石墨粘接接头的热分解动力学[J].化工学报,2006,57(6)_4.
[5].郑昕,刘俊成,白佳海等.石墨/陶瓷复合导电材料的制备及性能[J].复合材料学报,2009,26(4)_4.
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[8].邵磊.磨碎碳纤维增强环氧树脂/石墨双极板材料制备与性能研究[D].2009.
[9].M. V. Hosur,S. M. Waliul Islam,U. K. Vaidya et al. Experimental studies on the punch shear characterization of satin weave graphite/epoxy composites at room and elevated temperatures [J]. Materials Science & Engineering. A, Structural Materials:Properties, Microstructure and Processing,2004,368 (1/2)_11. DOI:10.1016/j.msea.2003.11.001.
[10].RHEE K.Y.. Mode I Fracture Resistance Characteristics of Graphite/Epoxy Laminated Composites [J]. Polymer Composites,2000,21 (2)_10.
[11].邵磊,李爱菊,李腾等.环氧树脂/石墨双极板复合材料的性能分析[J].人工晶体学报,2009,38(2)_4.
[12].Gaier JR.,Bunch JRT.,Davidson ML. et al. Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation [J]. Journal of Materials Research, 1998,13 (8)_5.
[13].Steven Hsin-Yi Lai,Chuh-Jung Chen. Smart Sensing and Control of a High-Speed Rotating Piezo-Embedded Graphite-Epoxy Beam-Mass System [J]. Journal of the Chinese Society of Mechanical Engineers. Series C,2004,25 (3)_11.
[14].李宝华,李开喜,吕春祥等.酚醛树脂炭/石墨复合炭材料用作锂离子电池负极材料的考察[J].新型炭材料,2000,15(2)_6.
[15].Skvortsova, LI,Kiryushov, VN,Aleksandrova, TP et al. Voltammetric determination of dihydroxybenzenes at a mechanically renewed electrode made from a graphite-epoxy composite [J]. Journal of Analytical Chemistry,2008,63 (3)_7.
[16].成荣,蒋世春,安立佳等.环氧树脂在石墨和碳纤维表面的浸润行为[A].2005.
[17].Amol Jadhav,Eyassu Woldesenbet,Su-Seng Pang et al. High strain rate properties of balanced angle-ply graphite/epoxy composites [J]. Composites. B, Engineering,2003,34 (4)_8.
[18].W.G. FISHER,J.M.E. STOREY,S.L. SHARP et al. Nondestructive Inspection of Graphite-Epoxy Composites for Heat Damage Using Laser-Induced Fluorescence [J]. Applied Spectroscopy,1995,49 (9)_7.
[19].卢学峰,喇培清,何玲等.原位聚合法制备环氧树脂/石墨复合材料的性能研究[J].应用化工,2010,39(6).
[20].Yosif Golfman. The Fatigue Strength Prediction for Aerospace Components Using Reinforced Fiber Glass or Graphite/Epoxy [J]. Journal of advanced materials,2004,36 (2)_5.
[21].周震涛,李海军,孙斌等.环氧树脂包覆改性天然石墨的结构与性能[A].中国科学技术大学学报固态离子学专辑[C].2002.
[22].Sukjoo Choi,Bhavani V. Sankar. Fracture toughness of transverse cracks in graphite/epoxy laminates at cryogenic conditions [J]. Composites. B, Engineering,2007, 38 (2)_8.
[23].Thomas M. Ely,Eric v. K. Hill. Longitudinal Splitting and Fiber Breakage Characterization in Graphite Epoxy Using Acoustic Emission Data [J]. Materials Evaluation,1995,53 (2)_7.
[24].林大庆,黎昱,董艺等.石墨纤维/改性氰酸酯复合材料的应用研究[J].宇航材料工艺,2008,38(5)_4.
[25].郭莹娟.环氧树脂基复合型导电材料制备工艺研究[D].2005.
[26].NAVIN CHAND, DEEPAK JAIN. Evaluation of a.c. conductivity behaviour of graphite filled polysulphide modified epoxy composites [J]. Bulletin of Materials Science,2004, 27 (3)_7.
[27].Kyong Y.Rhee,Chang H.Chi. Determination of Fracture Toughness,G_c of Graphite/Epoxy Composites from a Cracked Lap Shear (CLS) Specimen [J]. Journal of Composite Materials,2001,35 (1)_17.
[28].冷金凤,姜龙涛,武高辉等.石墨增强体对SiC/Gr/Al复合材料干摩擦磨损性能的影 响[J].稀有金属材料与工程,2009,38(11)-5.
[29].韩建,唐伟,王旭等.聚工烯(PB)/石墨复合材料结晶和力学性能的研究[J].稀有金属材料与工程,2008,37(z2)_5.
[30]. R.Bailey,J.Wood. Postbuckling behaviour of square compression loaded graphite epoxy panels with square and elliptical cut-outs [J]. Thin-Walled Structures,1997,28 (3)_25.
[31].魏彤,范壮军,刘朗等.陶瓷/石墨复合材料的制备及高温氧化性能[J].稀有金属材料与工程,2007,36(z1)_3.
[321.刘国钦,闫珉.利用细鳞片石墨制备膨胀石墨的研究[J].新型炭材料,2002,17(2)6.
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