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1、ProgressinOrganicCoatings47(2003)147153TrialkoxysilanegraftingontonanoparticlesforthepreparationofclearcoatpolyacrylatesystemswithexcellentscratchperformanceFrankBauera,∗,Hans-JürgenGläsela,UlrichDeckera,HorstErnstb,AnnetteFreyera,EberhardHartmanna,VolkerSauerla
2、ndc,ReinerMehnertaaInstitutfürOberflächenmodifizierung,Permoserstr.15,D-04318Leipzig,GermanybUniversitätLeipzig,Inst.fürExperimentellePhysikI,Linnéstr.5,D-04103Leipzig,GermanycBrukerDaltonikGmbH,Permoserstr.15,D-04318Leipzig,GermanyReceived30January2003;accepted21
3、June2003AbstractTransparentreinforcedpolyacrylateswerepreparedusingnanosizedfillerparticleswithradiation-curableacrylates.Toimproveembed-dingofthenanofillerswithintheacrylatematrixthefillersurfacewaschemicallymodified.Thismodificationofthesilicaandaluminananoparticle
4、swasaccomplishedbytrimethoxysilaneshavingmethacryloxypropyl(MEMO),vinyl(VTMO),andn-propyl(PTMO)func-tionalities.Duetoacidcatalyzedcondensationoforganosilanesapolysiloxaneshellwasformedaroundthenanoparticles.ThisshellisbondedtoOHgroupsonthefillersurface.Theappeara
5、nceofcovalentSiOSiRbondswasclearlyshownbymultinuclearMASNMR.MALDI-TOFmassspectroscopyrevealedtheformationofpolysiloxaneoligomerswithdifferentdegreesofcondensation.Intheworkpresented,anacrylate-nanocompositeformulationcontainsupto35wt.%nanosizedsilicacoveredwithp
6、olysiloxanes.ForMEMOmodification,surface-anchoredmethacrylgroupscancopolymerizewithnetworkacrylates.ButalsoPTMO-modifiedcompositematerialsexhibitmarkedlyimprovedpropertiesascomparedtotheneatacrylatepolymer;e.g.,anincreasedmodulusandheatresistance,improvedscratchan
7、dabrasionresistance.Thismakespolyacrylatenanocompositesaverypromisingnewcoatingtechnologyformanyfarreachingtechnicalapplications.©2003ElsevierB.V.Allrightsreserved.Keywords:Coatings;UVandEBcuring;Nanocomposite;Acrylate;Silane1.Introductiondrophilic.Addedtosemi-o
8、rnon-polarliquidssuchasacry-lates,aggregatesofnanoparticleswillresultinthickeningofToimprovethescratchresistanceofclearcoatingsnano-theacrylateformulation.Forexample,
