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1、中北大学2014届毕业论文膨胀石墨对丁腈橡胶性能的影响摘要:膨胀石墨是一种层状材料,具有优异的导电性和导热性。本文采用机械共混的工艺方法制备了膨胀石墨/丁腈橡胶复合材料,考察了膨胀石墨对丁睛橡胶导电性能和力学性能的影响。在不加膨胀石墨的情况下,采用直接共混的方法制备高耐磨炭黑/丁腈橡胶硫化胶,实验表明,当加入20份高耐磨炭黑时,丁腈橡胶具有优异的综合力学性能,其最大拉伸强度为12.85MPa,邵尔A氏硬度为60.4度。采用直接共混的方法制备膨胀石墨/高耐磨炭黑/丁腈橡胶复合材料,并与炭黑/丁腈橡胶复合材料进行比较研究了材料的力学
2、性能与导电性能。结果表明添加膨胀石墨后可大大的提高炭黑/丁腈橡胶复合材料的导电性能和力学性能,研究表明,填加10份膨胀石墨时,纳米复合材料的拉伸强度最大,为13.7MPa,是不含膨胀石墨的复合材料的l.54倍。导电性能研究显示,填加l0份膨胀石墨时,纳米复合材料的表面电导率和体积电导率分别为1.1×10-9S/cm和1.2×10-9S/cm。当不含膨胀石墨时,丁腈橡胶复合材料基本不表现出导电性能。关键词:丁腈橡胶,膨胀石墨,导电性能中北大学2014届毕业论文TheInfluenceofExpandingGraphiteonthe
3、PropertiesofNBRAbstract:GraphiteisalayeredmaterialPossessingexcellentlubricationpropertyandhighaspectratioinanexfoliatedstate,anditisalsooneofthestrongestmaterialsPerunitWeightwithuniquefunctionalProperties,e.g.goodelectricalandthermalconductivities.Inaddition,graphi
4、teisverycheapcomparedtocarbonnanotubes.ThispaperstudiedtheeffectofexpandinggraphiteonthepropertiesofNBR,thenexpandedgraphite/NBRcompositematerialwaspreparedbyMechanicalblending.Intheabsenceofexpandedgraphitecase,bythemethodsofdirectblendingandpreparationofHAF/NBR,its
5、howedthat,whenaddedto20persofHAF,NBRhasgoodcomprehensivemechanicalproperties,themaximumtensileforceis12.85MPa,shorehardnessis60.4.Bythemethodsofdirectblendingandpreparationofexpandedgraphite/HAF/NBRComposites,andcomparedwiththeHAF/NBRinmechanicalpropertiesandelectric
6、alproperties.Inaddtion,westudiedtheinfluenceofthetypesandamountofexpandedgraphiteonthepropertiesofNBR.Theresultsshowedthattheadditioncangreatlyimprovetheelectricconductivityandmechanicalpropertiesofthenitrilerubbercomposites.Studieshaveshownthatfilledwith10partsofexp
7、andedgraphite,themaximumtensilestrengthofthecompositematerialreachesthemaximumof13.7,beingl.54timesthatwithoutexpandedgraphite.Theelectricalconductivityexaminationindicatedthatthesurfaceandvolumeelectricalresistivityofthecompositecontainingl0phrexpandedgraphitewere1.
8、1l0-9S/cmandl.2l0-9S/cmrespectively,Whenwithoutexpandedgraphite,thenitrilerubbercompositematerialsdonotexhibitconductivity.Keywor