INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Effects of adding nano-clay (montmorillonite) on performance of polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives in Carapa guianensis, a tropical species
Autor/es:
R. MOYA; A. RODRIGUEZ-ZUÑIGA; J. VEGA-BAUDRIT; V. ALVAREZ
Revista:
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 59 p. 62 - 70
ISSN:
0143-7496
Resumen:
The aimofthisstudywastoimprovethebondstrengthresistanceofpolyvinylacetate(PVAc)andurea-formaldehyde(UF)adhesivesmodified withnano-clay(montmorillonite)withatropicalspeciesofwoodknown toexhibitadhesionrelatedproblems.Theseadhesiveswereevaluatedwith1.0and1.5wt%nano-clay concentrationswithlapshearstrength(SS),andthepercentageofwoodfailure(PWF)indryandwet conditionsbeingevaluated.Anadditionalaimofthisstudywastoobservethepresenceofnano-claywithin bothadhesivetypesusingAtomicForceMicroscopy(AFM)andtheTransmissionElectronMicroscopy(TEM).Color,viscosityandthethermostabilityoftheseadhesiveswithnano-claywerealsoevaluated.First,AFMandTEMstudiesshowedadequatedispersionandimpregnationofnano-clay.Theviscosity ofPVAcadhesivewasnotaffectedbytheincorporationofnano-clay,whereastheUFadhesivewas.WithbothPVAcandUFadhesives,thepresenceofnano-clayincreasedthe Ln and bn colorparameters,especiallywhen1.5wt%nano-claywasused.Theincorporationofthenano-clayimprovedthermostability,asdeterminedbythermogravimetricanalysis(TGA).Finally,itwasshownthatthenano-clay incorporationimprovedSSandPWF.ThehighestvaluesofSSwereobtainedwhennano-claywasaddedat1.5wt%concentrationinthePVAcadhesiveunderdryconditions.SSwasnotaffectedbynano-clay additionintheUFadhesiveunderdryconditions.However,underwetconditions,both1.0and1.5wt%loadingsofnano-clayincreasedSSwithbothadhesivetypes.Theadditionofnano-clayinboth proportionsincreasedPWFbyapproximately15%andbetween20?30% indryandwetconditions,respectively,forthePVAcadhesive.FortheUFadhesive,PWFincreasedbyapproximately10%underdryconditions and25?50% inwetconditions
