Species Dependence of pMDI/Wood Adhesion

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dc.contributor.authorMalmberg, Michael J.en
dc.contributor.committeechairFrazier, Charles E.en
dc.contributor.committeememberGlasser, Wolfgang G.en
dc.contributor.committeememberHelm, Richard F.en
dc.contributor.departmentWood Science and Forest Productsen
dc.date.accessioned2011-08-06T14:42:32Zen
dc.date.adate2003-11-25en
dc.date.available2011-08-06T14:42:32Zen
dc.date.issued2000-12-05en
dc.date.rdate2004-11-25en
dc.date.sdate2003-10-20en
dc.description.abstractPolymeric methylenebis(phenylisocyanate) (pMDI) has increasingly been used in the wood particulate composite industry. Wood composites, especially oriented strand board (OSB) are made with many variations of wood species. Little research has been done to investigate how pMDI adhesion has been affected by species. The present is divided into two parts. First, mode I fracture mechanics and surface free energy analysis was performed to investigate differences in adhesion between southern yellow pine and yellow-poplar bonded with pMDI. Secondly, an improvement in the synthesis of 13C, 15N labeled pMDI is discussed. Mode I fracture results show that pMDI adhesion was affected differently by southern yellow pine compared yellow poplar. The shear energy release rate was significantly higher in pine/pMDI composites than in yellow poplar/pMDI composites. The total surface energy of southern yellow pine was shown to be significantly greater than yellow poplar. The free energy of adhesion (DG) of the pine/pMDI and the poplar/pMDI was investigated. The DG indicated that the pine/pMDI system would take more energy to separate compared to the poplar/pMDI system. Lastly, a double-labeled 13C, 15N pMDI adhesive was successfully synthesized to produce Solid-State NMR composites.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-10202003-134743en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10202003-134743en
dc.identifier.urihttp://hdl.handle.net/10919/9624en
dc.publisherVirginia Techen
dc.relation.haspartfinal5.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectisocyanateen
dc.subjectNMRen
dc.subjectFracture Mechanicsen
dc.subjectWood Adhesionen
dc.subjectFTIRen
dc.titleSpecies Dependence of pMDI/Wood Adhesionen
dc.typeThesisen
thesis.degree.disciplineWood Science and Forest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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