聚乙烯基吡咯烷酮的分子運動和電荷存儲現(xiàn)象研究.pdf

1、中國科學技術(shù)大學碩士學位論文聚乙烯基吡咯烷酮的分子運動和電荷存儲現(xiàn)象研究姓名：時原申請學位級別：碩士專業(yè)：高分子化學與物理指導(dǎo)教師：張興元200905AbstractIVAbstractPolyvinylPyrrolidone(PVP)isahighlypolarpolymer.ThepyrrolidoneringinPVPmoleculecontainsadoublebondcarbonylwhichconnectstothemain

2、chainthroughanaebond.Thisactivelactamgroupatcertaintemperatureswillreactwithanumberofsubstancesgenerategetransfercomplex?thisgroupalsogivesPVPgoodgestagecapacity.TheknowledgeconcerningthegestagetransptofPVPelectretishigh

3、lyvaluablefsomeindustrialapplications.ThispaperstudiesthemolecularmovementspacegeofPVPelectretusingTSDCmethod.thePVPsampleusedintheexperimentisPVPK30serieswithamolecularweightof40000.Anindepthresearchwasaccomplishedbycha

4、ngingthepolarizationfieldstrengthpolarizationtemperatureheatingrate?dielectricrelaxationmethodwasusedasasupplementarymeasurementinstudyingthemolecularmotionofPVPtoverifytheresultsofTSDCmethod:1.TheTSDCspectraofPVPelectre

5、taboveroomtemperatureshowsthreepeaks:βpeakwhichiginatesfromsidegrouprelaxationαpeakwhichcrespondstotherelaxationofthefrozendipolesonthemoleculechainsegmentsduringglasstransitionρpeakwhichisattributedtothedetrappingofthet

6、rappedspacegeunderthermalstimulation.Whenthepolarizationfieldstrengthtemperaturechangeβpeakαpeak’spositionsremainunchangedwhiletheirpeakvalueschangeproptionallytopolarizationtemperature.Asfρpeakitspositiondoesnotchangewi

7、ththevariationofpolarizationfieldstrengthwhileitsvalueincreaseswiththeincreaseoffieldstrengthbuttherelationshipisnonlinear.Whenthepolarizationtemperatureincreasesρpeakmovestohighertemperaturethepeakvaluedecreasesthespace

8、gestagecapacityofthesamplegraduallyweakensbecausethehightemperatureallowsmegetodetrap.Withtheincreaseoftheheatingrateallthreepeaksmovetowardshighertemperaturetheirpeakvaluesalsoincreasebyvariousdegrees.Howevertheactivati