synthesis and characterization of hybrid proton conducting membranes of poly（vinyl alcohol） and phosphomolybdic acid

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1、SYNTHESISANDCHARACTERIZATIONOFHYBRIDPROTONCONDUCTINGMEMBRANESOFPOLY（VINYLALCOHOL）ANDPHOSPHOMOLYBDICACIDChineseJournalofPolymerScienceVol24,No.5,(2006),449—456ChineseJournalofPolymerScience◎2006WorldScientificSYNTHESISANDCHARACTERIZATIoNOFHYBRIDPROTONCONDUCTINGMEMBR

2、ANESOFPOLY(VINYLALCOHOL)ANDPHOSPHOMOLYBDICACIDArfatAnis,A.K.Banthia,S.MondalandA.K.ThakurbMaterialsScienceCentre,IndianInstituteofTechnology,Kharagpur721302,IndiabDepartmentoURhysics&Meteorology.IndianInstituteofTechnology,Kharagpur721302,IndiaAbstractHybridpro

3、tonconductingmembranesofpoly(vinylalcoho1)(PVA)andphosphomolybdicacid(PMA)werepreparedbysolutioncastingmethod.TheeffectofPMAdopingandPVAcrosslinkingdensityonthemembranepropertiesandprotonconductivitywereinvestigated.ThecrosslinkingreactionbetweenthehydroxylgroupofP

4、VAandthealdehydegroupofglutaraldehydefGA1wascharacterizedbvIRspectroscopy.ProtonconductivityofthemembranesincreaseswithanincreaseinconcentrationofthedopedPMAandalsowithanincreaseincrosslinkingdensityofthemembranes.Protonconductivityresultsindicatethatasignificantam

5、ountofPMAwasmaintainedinthemembranesevenafterseveralhoursofimmersioninwater.Amaximumconductivityof0.0101Scmwasobtainedforthemembranewith33.3wt%PMAandcrosslinkingdensityof5.825mo1%.X—raydiffractionstudieswerecarriedouttoinvestigatetheinfluenceofPMAdopingandcrosslink

6、ingdensityonthenatureofthemembranes.Thesepropertiesmakethemverygoodcandidatesforpolymerelectrolytemembranesfordirectmethanolfuelcellapplication.Keywords:Polymerelectrolytemembranes;Protonconductor;Phosphomolybdicacid;CrosslinkedPVAmembranesINTRoDUCTIoNFuelcellshave

7、emergedstronglyaspowersourcesforstationaryandportableapplicationsowingtotheirhigh—energyconversione币ciency.eco—friendlynatureandlow—temperatureoperation【1-31.DirectmethanolfuelcellsrDMFCs)usemethanolastheruelbecauseofitslowpriceandeasyhandling.Methanolcanbeoxidized

8、directlytocarbondioxideandwaterinDMFCsystems.DMFCisexpectedtohavehighandcomprehensivevalueascleanenergy.becauseithasahigh—energydensityandcanbege