Perfluoropolyether polymers by UV curing design, synthesis and characterization

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1、ResearchArticleReceived:22March2011Revised:11May2011Accepted:24May2011PublishedonlineinWileyOnlineLibrary:17October2011(wileyonlinelibrary.com)DOI10.1002/pi.3149PerfluoropolyetherpolymersbyUVcuring:design,synthesisandcharacterizationRobertaBongiovanni,a∗AndreaMedici,aAlbertoZompatori,bSi

2、lviaGaravagliabandClaudioTonellibAbstractPerfluoropolyether(PFPE)structurescanbefunctionalizedwithacrylicgroupsusingappropriatehydrogenatedacrylicmonomers:themacromersobtainedarehighlyreactiveunderUVirradiation,andfluorinatedpolymerscanbeobtained.Inthefirstpartofthisworkisdescribedthesynth

3、esisofnewPFPE(meth)acrylicoligomersbyextendingOH-terminatedfluorinatedchainswithurethanegroupsandreactiveacrylicfunctions.Thephotopolymerizationreactionofeachproductisthenreportedfollowedbythecharacterisationofthemainthermal,mechanicalandsurfacepropertiesofUV-curedcoatings.Thepolymershav

4、egoodthermalresistanceandfairmechanicalandchemicalresistance.Moreinterestinglytheyshowverylowrefractiveindexandlowsurfacetension.Fortheselatterpropertiestheproductscanbeadvantageouslyusedinhighlydemandingapplicationssuchasphotonicdevicesandnano-patterning.
c2011SocietyofChemicalIndustry

5、Keywords:perfluoropolyether;fluoroacrylates;UVcuring;surfacepropertiesINTRODUCTIONthemanufacturingofBragggratingswithahighthermo-opticcoefficient(dn/dT).18Also,inmicro-andnano-patterning,PFPEPerfluoropolyethers(PFPEs)haveinterestingpropertiessuchashighthermalandchemicalresistance,lowrefract

6、iveindexacrylatesaresuccessfullyemployedasanalternativetoepoxyandverylowsurfacetension.1,2Theytypicallycontainoneandsiliconematrices.19MonofunctionalacrylatescontainingPFPEortwoofthefollowingrepetitiveunits–CF2O–,–CF2CF2O–,chainshavebeenappliedassurfacemodifiersinUV-curable–CFCFCFO–and–C

7、F(CF)CFO–,theterminalgroupscanbeformulations.20,2122232CF3O–,C2F5O–andC3F7O–dependingonthesynthesisroute.InthiscontextitwasthoughtinterestingtofurtherexplorePFPE-Asuccessfulsynthesisprocessisbasedonthephoto-oxidativebasedplatformstoobtainnewproductssuitablefordemandingpolymeriz