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1、EuropeanPolymerJournal44(2008)1662–1672ContentslistsavailableatScienceDirectEuropeanPolymerJournaljournalhomepage:www.elsevier.com/locate/europoljMacromolecularNanotechnologyContactanglemeasurementsasatooltoinvestigatethefiller–matrixinteractionsinpolyurethane–clay
2、nanocompositesfromblockedprepolymerAlessandroPegoretti*,AndreaDorigato,MarcoBrugnara,AmabilePenatiDepartmentofMaterialsEngineeringandIndustrialTechnologies,INSTM-NIPLABResearchUnit,UniversityofTrento,viaMesiano77,38100Trento,ItalyarticleinfoabstractArticlehistory:
3、Opticallytransparentpolyurethane-claynanocompositefilmswerepreparedbydispersingReceived23September20075wt%ofvariouscommercialorgano-claysinamixtureofcycloaliphaticaminesusedasReceivedinrevisedform19February2008chainextender-cross-linkerofablockedprepolymer.Forthefir
4、sttime,vibration-inducedAccepted1April2008equilibriumcontactanglemeasurementsweresuccessfullyemployedtoranktheselectedAvailableonline12April2008organo-claysaccordinglytotheirhydrophobicityorder.Polymer–clayintercalationdegreeinthenanocomposites,asassessedfromX-ray
5、diffraction,wasstronglycorrelatedtothewater–clayequilibriumcontactangle.Moreover,astheclayintercalationdegreeincreased,Keywords:adecreaseofthecross-linkingdegreeofthepolyurethanematrixoccured.NanocompositesBlockedpolyurethaneUniaxialtensiletestsunderquasi-statican
6、dimpactconditions,andisothermalthermo-Claygravimetricanalysiswereperformedonbothunfilledpolyurethanematrixandnanocom-Contactangleposites.Secanttensilemodulus,tensileenergytobreak,andthermallifetimeshowedanonmonotonictrendwithamaximumasafunctionoftheintercalationdeg
7、ree.Thisbehaviourisdiscussedconsideringthattwoconcomitantandcontrastingeffectsdevelopasthepoly-mer–clayintercalationdegreeincreases:apositiveimprovementofthefillermatrixinter-actions,andanegativereductionofthematrixcross-linkingdegree.Ó2008ElsevierLtd.Allrightsrese
8、rved.1.Introductionmatricesbydevelopingnanocomposites,mostlybytheadditionoforgano-modifiedclays(organo-clays)[3–46].MACROMOLECULARNANOTECHNOLOGYOrganicco
