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ID:40960786
大小:2.03 MB
页数:10页
时间:2019-08-12
《Recent developments of polar piezoelectric polymers》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、1110E.Fukada:RecentDevelopmentsofPolarPiezoelectricPolymersRecentDevelopmentsofPolarPiezoelectricPolymersEiichiFukadaKobayasiInstituteofPhysicalResearchKokubunji,Tokyo,185-0024JapanABSTRACTFollowingtheextensivestudiesonthepiezoelectric,pyroelectricandferroelectricpropertiesofpolyvinylidenefluoridean
2、ditscopolymers,avastnumberofpolymerswereinvestigatedfortheseproperties.Piezoelectricthinfilmsofpolyureaowerepreparedbyvapordepositionpolymerizationinvacuumandstableupto200C.Piezoelectricoddnylonwascharacterizedbythefieldinducedrotationofamidedipolesinthemolecularsheetcrystallinestructure.Completelya
3、morphousvinylidenecyanidecopolymersproducedaremanentpolarizationproportionaltothelargedielectricrelaxationstrengthduringpoling.Drawnfilmsofpolylacticacidexhibitedthelargeshearpiezoelectricityduetothecrystallinestructureofhelicalmolecules,however,aremnantpolarizationwasalsoproducedbypolingathightempe
4、ratures.Variouspolymerscontainingdipolargroupsofcarbonyl,urethane,ureaandthioureabondswerepoledandtheirferroelectrichysteresiswasobserved.Applicationofmagneticfieldashighas10Teslatotheliquidcrystallinestateofhelicalmoleculesofpoly-γ-benzyl-L-glutamateduringfilmformationresultedinaveryhighshearpiezoe
5、lectricconstant26pC/N.Unprecedentedhighpiezoelectricconstantsuchas1000pC/Nwasfoundinthehighlyhydratedcorneamembraneconsistingofcollagenfibrils.IndexTerms―Piezoelectricity,pyroelectricity,ferroelectricity,dielectrichysteresis,remnantpolarization,dipole,polarpolymers.1INTRODUCTIONpolysaccharide,protei
6、nsandDNAandsyntheticpolymersPIEZOELECTRICITY,pyroelectricityandincludingpolypeptidesandopticallyactivepolymers[7].ferroelectricityaretheinterestingpropertiesofpolarpolymersTheshearpiezoelectricityoriginatesintheintrinsicfromtheviewpointofbothbasicresearchandpracticalmolecularstructureandcrystallines
7、tructure.Toobservetheapplications.Probablytheearliestreportofthepiezoelectricpiezoelectriceffectinsyntheticpolymers,thedrawingoreffectinpolymersisthepaperbyBrain[1]appearedin1924.elongationisusuallyne
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