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1、wJournalofMacromolecularScience,PartB:Physics,45:53–60,2006Copyright#Taylor&FrancisLLCISSN0022-2348print/1525-609XonlineDOI:10.1080/00222340500407855PreparationandCharacterizationofPoly(MethylMethacrylate)CoatedTiO2NanoparticlesB.J.PARK,J.H.SUNG,K.S.KIM,I.CHIN,ANDH.J
2、.CHOIDepartmentofPolymerScienceandEngineering,InhaUniversity,Incheon,KoreaTitaniumdioxide(TiO2)nanoparticlesweremodifiedwithpoly(methylmethacrylate)(PMMA)toimprovethedispersionstabilityofthenanoparticlesinadielectricmediumandtoreducethedensitymismatchbetweenTiO2andadi
3、electricmediumforamicrocapsule-typeelectrophoreticdisplayapplication.NanoparticleswerecoatedwithPMMAbyinsitudispersionpolymerization.ThePMMA-coatedTiO2nanoparticleswerecharacterizedbyfouriertransform-infraredspectrometrey(FT-IR),electrophoreticlightscattering(ELS),an
4、dscanningelectronmicroscopy(SEM).DensityofPMMA-coatedTiO2nanoparticleswasfoundtobedependentonthethicknessofthePMMAcoatingonthenanoparticles.AnincreaseofthermalstabilityofthePMMAlayerandthecontentsofPMMAonthesurfaceofthenano-particlesweremeasuredviathermogravimetrican
5、alysis(TGA).Keywordsdispersion,electronicink,TiO2,nanoparticleIntroductionControlofthecolloidalpropertiesandstabilityoftitaniumdioxide(TiO2)suspensionsisofsignificantimportanceinmanufacturingdiversehigh-performanceproductssuchas[1–5]paints,cosmetics,andphotocatalystst
6、onameafew.TiO2nanoparticlesarealsostudiedforapplicationinelectronicink-basedflexibledisplays,becauseoftheirhighrefractivityandexcellentwhitenessforgoodimagecontrastindarksuspension[6]media.ThedispersionstabilityofTiO2nanoparticlesisconsideredtobeoneofthemostdifficultpr
7、oblemstosolveinelectrophoreticdisplayapplication.Recentlytherehavebeenmanyattemptstoenhancethedispersionstabilityof[7–12]inorganicnanoparticlesusingseveraldifferentmethods.Surfacemodificationoftheinorganicparticlesbycoatingwithpolymericmaterialsprovidednotonlyhighelec
8、trostaticrepulsionbutalsorepulsionduetoadsorbedpolymerlayers,knownasstericrepulsion.Moreover,thedensitymismatchbetweennanoparticles