可聚合表面活性剂在磁性纳米材料制备中的应用1

Communication,2009-01-15,32(1):73CHINASYNTHETICRUBBERINDUSTRYApplicationofpolymerizablesurfactantinthepreparationofmagneticnanocompositeLiRuixue,WangWenzhi,LiuBaoyu,XuMeiyun,ZhangYonghua3(CollegeofMaterialsScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,China)Surfactantsplayacrucialroleinpreparationoforganic/inorganicnanocompositesthroughsurfacemodificationofinorganicnanoparti2cles.Recently,polymerizablesurfactantswhichcontainreactivedoub2lebondsareattractingmoreandmorescientificandindustrialattentionfortheirapplicationinthefieldsofemulsionpolymerization,nanoma2terialspreparation,etc.Inthiscommunication,monooctadecylmal2eateaspolymerizablesurfactantsynthesizedbyesterificationofmaleicanhydrideandoctadecanolwasusedtosurface2modifyFe3O4nanoparticles.Apolymerizablemagneticfluidwasobtainedbydirectlydis2persingmodifiedFe3O4nanoparticlesintostyreneandmagneticnanocompositewaspreparedthroughfreeradicalpolymerizationofpolymer2izablemagneticfluid.Thetransmissionelectronmicroscopephotographofthepolymeriz2ablemagneticfluidandthemagneticnanocomposite(asshowninFig1)indicatethattheFe3O4nanoparticlesmodifiedbymonooctadecylmaleatewiththesizeofabout7nmwerehomo2dispersedintostyreneandfixedincompositeduringtheprocedureofpolymerization.Instyrene(100)Inpolystyrene(120)Fig1TEMphotographsofFe3O4instyreneandinpolystyreneFouriertransform2infraredspectroscopyspectraofcopolymerofmo2nooctadecylmaleateandstyreneandcompositeafterremovingFe3O4nanoparticles(Fig2)revealthatmonooctadecylmaleateusedassur2facemodifierofFe3O4nanoparticlescopolymerizedwithstyrenebe2causethecharacteristicabsorptionband(1635cm-1)ofCCdoublebondsofbothmaterialsvanished.Fig2FTIRspectraofstyrene2monooctadecylmaleatecopolymer(a)andcompositeafterremovingFe3O4(b)Theglasstransitiontemperature(Tg)andthethermalstabilityofcompositewerestudiedbydifferentialscanningcalorimetryandther2mogravimetricanalysis.Tgofcompositeis68,16lowerthanthatofpurepolystyrene(PS,84)butthethermalstabilityisobvi2ouslyimprovedasthetemperatureofquickestmassloss(416)ishigherthanthatofpurePS(409).Gelpermeationchromatographycurvesofcomposite(afterremovingFe3O4)andPSshowtherelativemolecularmassofcompositedecreasedremarkablycomparedwithPS.TheresultsfurtherprovedthatpolymerizablesurfactantonthesurfaceofFe3O4nanoparticlesreactedwithpolystyrenereactivelongchainandledtochaintermination.Thethermalstabilityofcompositeisob2viouslyimprovedbythestronginteractionofcovalencebondbetweenFe3O4nanoparticlesandPSmatrix.References:[1],,,.Fe3O4/[J].,2003,24(9):1717-1720.[2]ChenShouming,ZhangYonghua,XiongHongbing,etal.StructureandpropertiesofFe3O4nanoparticlepolystyrenecomposite[J].,2003,26(2):119.,,,,3(,510640),Fe3O4,,7nmFe3O4,;,,(PS),,PS,PS,Fe3O4:;;;;Received:2008-07-10.Biography:LiRuixue,doctoralstudent.Foundationitem:SupportedbytheNaturalScienceFoundationofGuangdongProvince(020891).3Towhomallcorrespondenceshouldbeaddressed.