Adhesive penetration in beech wood.pdf

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1、WoodSciTechnolDOI10.1007/s00226-011-0410-6ORIGINALAdhesivepenetrationinbeechwood:experimentsPhilippHass•FalkK.Wittel•MillerMendoza•HansJ.Herrmann•PeterNiemzReceived:17March2010ÓSpringer-Verlag2011AbstractAstudywithsynchrotronradiationX-raytomographicmicroscopy(SRXTM)ofPUR,PVAc,andUFadhesi

2、vebondlinesinbeechwood,bondedundervariousgrowthringangles,ispresented.Thebondlinemorphologiesandtheadhesivepenetrationintothewoodstructurewereevaluatedafterdeterminingthehardeningcharacteristicsoftheadhesives.Distinctbondlineimperfectionswerefoundforthedifferentadhesivesystems.Todescribet

3、headhesivedistributioninsidethebondline,thesaturationoftheporespaceinsteadofthecommonlyusedmaximumpenetrationdepthseemstobeadequate.IntroductionModerntimberengineeringgreatlyreliesonwoodadhesivebonding.Themajorityofhighlyengineeredwood-basedproductshavebeendevelopedontheprincipleofcutting

4、woodintosmallerpiecesandjoiningthemagainbyadhesivebonding.Inthisway,thenaturalanisotropyofwoodcanbereduced,andlargerdimensionsofstructuralelementswithimprovedcharacteristicsbecomepossible.Eventhoughbondingofwoodelementsisarathersimpleprocessingstep,thedetailsofthepenetrationofthehardening

5、adhesivesintotheporouswoodskeletonontheseveralhierarchicallevels(frommicroscopictomacroscopic)arerathercomplicated.Itisstronglyinfluencedby:(i)woodfactorssuchaswoodspecies,anatomicalorientation,orsurfaceroughness,(ii)adhesivefactorssuchastypeofadhesiveorviscosity,and(iii)processfactorssuch

6、asappliedpressureortemperature,whichhaveasignificantinfluenceonthebondingperformance(KamkeandLee2007).Formerstudiesonadhesivepenetrationweremainlyperformedusingmicroscopyofcross-sectionsandmicro-slides(KamkeandLee2007;Serneketal.1999;P.Hass(&)
F.K.Wittel
M.Mendoza
H.J.Herrmann
P.NiemzInstit

7、uteforBuildingMaterials,ETHZurich,Schafmattstrasse6,8093Zurich,Switzerlande-mail:phass@ethz.ch123WoodSciTechnolSuchsland1958).Moreintegralstudieswereperformedusingporosimetry(WangandYan2005)orneutronradiography(Niemzetal.2004).Tomeasureadhesivepenetrationofcellwalls