silica nanocomposite

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1、SilicaNanocompositeCHINESE.10URNALOFCHEMICALPHYSICSV0LUMEl9.NUMBER6DECEMBER27,2006ARTICLETwo..dimensionalATR..FTIRSpectroscopicStudyontheBehaviorinPolyimide/SilicaNanocompositeYiShen,Hal—taoWang,WeiZhong,Pei—yiWuDepartmentofMacromolecularScience,FudanUniversity,TheKeyLaboratoryof"MolecularEn

2、gineeringofPo

3、ymer5MinistryofEducationShanghai200433.China(Dated:ReceivedonFebruary17,2006;AcceptedonMarch29,2006)Toc0Ilsiderthereliabilityandperformanceofelectronicdevicesbasedonpolyimidederivatives,dynamicwatersorptionanddiffusionbehaviorinapolyimidederivative:poly(4'4oxydiphenylenepyromel

4、litimide)fPMDA—ODA1/silicananocompositewa8investigatedbytwo—dimensionalATRl_FTIRspectroscopy,bywhichtt1reestate8ofwatern]oleculesowningdifierentH—bondingstrengthweredistinguished.TheamountsandstrengthofHboTidingalsoplayedasignificantroleindeterminingthediffusionrateofthedifferentstatesofwate

5、rTnolecules.ThetypeofaggregatedwatermoleculeswhichalsoformedH—bondingwithsilicicacidfresi(1I1es)orpolyimidesystemwasthelastonediffusingtothepolymersideincontactwiththeATIcrystaleleInentbccausetheDolynlericmatrixblockedtheirdiffusionto_agreatextent.ThediffusionCOOfticientwasalsoestimatedtogai

6、ntheinformationofthedynamicdifitmionbehavior.Kevwords:Two—dimensionalATR—FTIRspectroscopy,Polym1ide/silicananocomposite,H—bondingI.INTR0DUCT10NPolyinfidcfPI)derivativeshaveattractedinanyre—searcheffortsfortheirpotentialapplicationsinmicro—electronics,photonics,opticsandaerospaceindustries,ow

7、ingtotheirhighthermalstability.excellentmechani—calproperties.gooddielectricpropertiesandhighchem-icalresistance….AinongthevariedpropertiesofPIderivativesinvestigated.itswatersorptioncharacteris-ticisoneoftilemostitnportantsubjectswithregardtothereliabilityandperformanceofelectronicdevicesba

8、sedonPIs.becausewatercausesmetalcorrosionfail—tireoftheadhesiontometalsanddegradationofdielec-tricproperties『2].Thatis,thedetailedinvestigationofthebehaviorofthewatermoleculesadsorbedandtransportedinPIderivativesisveryimportantfromtilepointofviewof