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1、PolymerTesting28(2009)8–12ContentslistsavailableatScienceDirectPolymerTestingjournalhomepage:www.elsevier.com/locate/polytestMaterialPropertiesComparisonofthemechanicalpropertiesatsimilarhardnesslevelofnaturalrubberfilledwithvariousreinforcing-fillersa,b,*ccN.Rattanasom,S.Prasertsri,T.Ruangri
2、tnumchaiaInstituteofScienceandTechnologyforResearchandDevelopment,MahidolUniversity,Salaya,NakhonPathom73170,ThailandbCentreforRubberResearchandTechnology,MahidolUniversity,Salaya,NakhonPathom73170,ThailandcDepartmentofChemistry,FacultyofScience,MahidolUniversity,Bangkok10400,Thailandarticl
3、einfoabstractArticlehistory:Commercially,thealterationofarubberformulationisusuallymadeinsuchawayastoReceived6June2008keepthehardnessoftherubberproductconstant.ThisisbecauseaspecifichardnessoftheAccepted13August2008rubberproductsetsthelimittoitspracticalapplications.Therefore,inthispaper,nat
4、uralrubber(NR)vulcanizatescontainingvariousfillerswerepreparedtohavethesameKeywords:hardnesslevel,andtheirmechanicalpropertieswerecomparedandrelatedtothedegreeNaturalrubberoffillerdispersion.Theresultsshowthathigheramountsofcarbonblack(CB)andsilicaSilicaareneededforCB-andsilica-fillednaturalru
5、bbervulcanizatestoachievethesameCarbonblackhardnessvalueasaNRvulcanizatecontaining6phrofmontmorilloniteclay.AtequalClayMechanicalpropertiesloadingoffillers,clay-filledvulcanizateexhibitshighermodulus,hardness,tensilestrengthFillerdispersionandcompressionset,butlowerheatbuild-upresistanceandcr
6、ackgrowthresistancethanthoseofthevulcanizatescontainingconventionalfillers.Forthevulcanizatehavingthesamehardnessvalue,CB-filledvulcanizategivesthebetteroverallmechanicalpropertiesfollowedbytheclay-filledandsilica-filledvulcanizates,respectively.Theexplanationisgivenasthebetterdispersionofcarbo
7、nblack,ascanbeseenintheSEMmicrograph.Ó2008ElsevierLtd.Allrightsreserved.1.IntroductionInrecentyears,nanoclayshaveattractedmuchatten-tionbecauseoftheirabilitytoenhancethemechanicalNaturalrubber(NR)exhibitsoutstandingpropertiespropertiesofrubbervulcanizate
