Polymer/Carbon Nanotube Composites with High Dielectric Constant and Low Dielectric Loss Prepared by Electrospun-in-situ Film-forming Technique-中国聚合物网,论文下载

Polymer/Carbon Nanotube Composites with High Dielectric Constant and Low Dielectric Loss Prepared by Electrospun-in-situ Film-forming Technique

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CNT Composites Dielectric properties Electropinning

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通用高分子材料

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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.

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2013-06-26 14:01:16

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