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ID:32466295
大小:1.43 MB
页数:49页
时间:2019-02-06
《电弧法单壁碳纳米管的纯化及其改性丁苯橡胶的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、硕士学位论文I乜弧法单壁碳纳米管的纯化及】£改性丁苯橡胶的研究摘要由于碳纳米管具有独特结构,极优异的力学性能、热学性能和电磁性能,因此,它从发现之初便吸引了大量的关注。单壁碳纳米管更是由于其独特的一维纳米结构、高强度和模量,而被看作优异的补强材料。本文系统研究了电弧法制备的单壁碳纳米管(arc—SwNTs)的纯化方法,分析了硝酸酸化过程和离心分离过程对SWNTs纯度的影响;并应用纯化后的SWNTs通过溶液共混法制备了单壁碳纳米管/丁苯橡胶复合材料,研究了SWNTs/SBR的力学性能和热学性能。结果表明:硝酸
2、酸化的过程有效除去了arc—SWNTs中的会属催化剂颗粒和大部分的无定型碳杂质,同时,它在碳纳米管表面引入了羧基、羟基等氧化性基团。高速离心的方法能使碳纳米管存在于离心悬浮液中,而碳颗粒杂质形成沉淀,从而分离得到高纯度的单壁碳纳米管。单壁碳纳米管的加入明显提高了丁苯橡胶的强度和韧性。当SWNTs含量为l%时,SWNTs/SBR复合材料展现了最好的力学性能,其拉伸强度比丁苯橡胶增强了54%,M100增大了30%,硬度增强了15%。SWNTs的存在提高了橡胶的降解温度,SWNTs对橡胶基体起到了热稳定效应。关键
3、词:单壁碳纳米管,酸化,离心分离,丁苯橡胶,力学性能,热稳定性能硕士学位论文电弧法甲-壁碳纳米管的纯化及其改性丁苯橡胶的研究ABSTRACTBecauseoftheiruniqueStnlctUreandsignificantadvantages,suchasstrongmechanicalproperties,highthermalstability,electricalandmagneticpropegies,carbonnanomlⅪshaveattractedconsiderableattentio
4、nsincebeingdiscovered.111cnovel1-Dllanometersize谢t}lhiglltensilestrengthandmodulusmakesSWNTsagoodcandidatefurproducingreinforcedcompositewithvariousmatrics.TllisstudywasfocusedOnthepurificationofarc—SWNTsandtheapplicationofSWNTsasreinforcementforSBR.Awetch
5、emistryprocedurewhichcoupledHN03oxidationandadispe格ion-centrifugationcyclewasappliedtothedissolutionandpurificationofas—preparedarc-SWNTs.ItwasvalidatedthatHN03oxidationtreatmenteffectivelyremovedmostoftheamorphouscarbonandmetalparticles,andgeneratedlittle
6、hydrophilicgroupsuchascarboxylandhydroxylonthesurfacesofSWNTs.Thesolublesamplewasfraetionatedviaadispersion-eentrifugationcycle,carbonnano—particleswereremovedandhighlypureandwell—separatedSWNTsweresuccessfullyobtainedinthemiddlefraction.SWNTsreinforcedthe
7、mechanicalpropertiesofSBRobviously.TheSWNTs/SBRcompositewithlwt%SWNTsexhibitedthebestmechanicalproperties.ComparingtopureSBR,itstensilestrengthimprovedbY54%,Miooandrigiditywerereinforcedrespectivelyby30%and15%.ItWasalsofoundthatsmallamountofSWNTsaccelerate
8、dthedegradationtemperatureofSBRandthereforetheyimprovethestabilityofSBRinair.Keywords:Single—wailedcarbonnanotubes,Acidoxidation,Dispersion—separation,SBR,Mechanicalproperty,Thermalstability¨声明本学位论文是我在导师的指导下取
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