Recent developments of polar piezoelectric polymers

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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