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固化环氧树脂中制备聚合物粘土矿物纳米复合材料文库.pdf

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Availableonlineatwww.sciencedirect.com AppliedClayScience42(2008)116–124 www.elsevier.com/locate/clay Preparationofpolymer/claymineralnanocompositesviadispersionof silylatedmontmorilloniteinaUVcurableepoxymatrix ⁎ A.DiGiannia,E.Amerioa,O.Monticellib,R.Bongiovannia, aPolitecnicodiTorino,DipartimentodiScienzadeiMaterialieIngegneriaChimica,C.soDucadegliAbruzzi24,10129Torino,Italy bUniversitàdiGenova,DipartimentodiChimicaeChimicaIndustriale,V.Dodecaneso31,16146Genova,Italy Received11May2007;receivedinrevisedform21December2007;accepted28December2007 Availableonline17January2008 Abstract Surfacemodificationofclaymineralsplaysanimportantrolefortheirapplicationasfillersforpolymericmaterials.Amongthemany modificationreactions,thesilanizationreactionusesalkoxysilanesandexploitstheOHreactivesitesofthemontmorillonitestructure.Wefound thatusinganexcessofsilaneitispossibletofunctionalizetheclaymineraland,atthesametime,tointercalatesomemonomersoroligomersinto theclaymineralgalleries,greatlyenhancingtheinterlayerdistance.Themontmorillonitemodifiedinthiswayhasbeenthenusedinthe preparationofnanocompositecoatingsbymixingitwithaphotocurableepoxymatrix.AfterUVirradiationthecoatingsobtainedweresubmitted tomorphological,thermalandmechanicalanalysis.Thephotopolymerizationkineticswasalsoinvestigated.Theintroductionofthemodified montmorilloniteallowedtoobtaintransparentnanocompositecoatingscharacterizedbyamixedintercalated/exfoliatedstructureandbetter thermalandscratchresistanceperformancesincomparisonwiththemontmorillonitefreecoatings. ©2008ElsevierB.V.Allrightsreserved. Keywords:Silylation;Montmorillonite;Epoxides;Nanocomposites 1.Introductionorderedanymorebutseparatelyandhomogeneouslydispersed intothematrixassingleplatelets.Inmanycasesamixtureof Nanocompositematerialsbasedonpolymericmatricesintercalatedandexfoliatedstructureisobtained,thussingle containinginorganicnano-objectshavebeenintensivelystudiedplateletsandtactoidsarebothpresentinthematerial.Thebest inthelastdecadesbecaus