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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

資料大小：

80K

所屬學(xué)科：

分子表征

來源：

第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)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(shí)間：

2013-06-26 14:01:16

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