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Polymer/Carbon Nanotube Composites with High Dielectric Constant and Low Dielectric Loss Prepared by Electrospun-in-situ Film-forming Technique  
Polymer/Carbon Nanotube Composites with High Dielectric Constant and Low Dielectric Loss Prepared by Electrospun-in-situ Film-forming Technique
資料類型： PDF文件
關(guān)鍵詞： CNT  Composites  Dielectric  properties  Electropinning  
資料大?。?/td> 80K
所屬學(xué)科： 分子表征
來源： 第六屆亞歐研討會上處理和性能增強聚合物會議文集（2013.6.2-6 武漢）
簡介：
Inrecentyears,polymersbasedondielectricmaterialswithhighdielectricconstantandlowdielectriclosshaveattractedconsiderableinterestduetotheirpotentialapplicationsinartificialmuscles,energystorage,flexibleelectronics,andsensors,etc.Inmostcases,ceramicfillersormetalparticlesorcarbonnanotubeswereaddedintothepolymermatrixtoincreasethedielectricconstant.However,thisinevitablyledtotheobviousincreaseindielectricloss.Tosolvethisproblem,inthiswork,orientatedmultiwallcarbonnanotubes(MWNTs)array/Polyvinylalcohol(PVA)nanocompositefilmswerepreparedbyusinganelectrospun-in-situfilm-formingtechnique.Forcomparisonpurpose,thecompositefilmswithMWNTsrandomlydispersedinPVAmatrixwerealsopreparedbysolutioncasting.Theresultsshowedthatthetwotypesofcompositeshadgreatlydifferentmicrostructuresanddielectricproperties.Comparedwithsolutioncastingcompositefilms,MWNTsinelectrospun-in-situcompositefilmswerenotonlyuniformlydispersedinPVAmatrix,butalsoalignedinonedirection,whicheffectivelypreventedMWNTstocurl,windandformtheconnectingnetworks,andthusdramaticallyincreasedthepercolationthresholdfrom0.5wt%t02.8wt%.Asaresult,thedielectricconstantoftheelectrospun-in-situformedfilmswassignificantlyincreasedupt0105forthefilmswith4.0wt%MWNTs.Moreimportantly,aratherlowdielectricloss(一0.8)wassuccessfullyachievedwiththeincorporationof4.0wt%MWNTs.However,forthecompositesfilmspreparedbysolutioncasting,althoughahigherdielectricconstant(～400)wasobtainedbyadding4.0wt%MWNTs,thedielectriclossreachedaparticularlyhighvalue(一i5).Ourworkindicatesthatpolymer/MWNTsdielectricmaterialswithhighdielectricconstantandlowdielectriclosscouldbesuccessfullyobtainedbyusingelectrospinningin-situfilm-formingtechniqueduetothewell-dispersionandalignmentofMWNTsinpolymermatrix.
作者： M. Tian, X. Bai, N. Y. Ning, L. Q. Zhang
上傳時間： 2013-06-26 14:01:16
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