Abstract
Thesurfacetreatmentofglassbeadsbysilanecouplingagenthavingmercaptogroupwascarriedout.Thetreatedglassbeadswereincorporatedwithpolyisoprene,andthenvulcanized.Theeffectsofamountofchemisorbedsilaneandalkoxygroupnumberofsilaneonthemechanicalpropertiesofthefilledcompositewereinvestigated.Forthispurpose,silaneswithdialkoxyandtrialkoxystructureswereused・Theamountofchemisorbedsilaneontheglassbeadsurfacewasvariedfromtwotoninetimesoftheamountrequiredformonolayercoverage.Thestressatthesamestrainincreasedbythesilane-treatmentofglassbeads,anditwashigherinthedialkoxystructurethanthetrialkoxystructure.Therewasnosignificantinfluenceofamountofchemisorbedsilaneonthestressfortrialkoxysilanestructure.Whereas,thestresswasinfluencedbytheamountofchemisorbedsilaneandthemaximumstresswasobservedatfivetimesofthesilaneamountrequiredformonolayercoverageforthedialkoxystructure.Thetendencyofthestressvalueshowedagoodrelationwiththeamountofunextractedpolyisoprenemeasuredbyanextractiontestofsilane-treatedglassbeads/polyisoprenemixtureinatetrahydrofuransolution.Thereinforcementeffectbythesilanetreatmentofglassbeadswasfoundtobeaffectedstronglybytheentanglementofsilanechainandpolyisoprenerubbermoleculesintheinterfacialregion.
