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dc.contributor.authorMirabile, Kyle Vincenten_US
dc.date.accessioned2015-10-23T08:00:30Z
dc.date.available2015-10-23T08:00:30Z
dc.date.issued2015-10-22en_US
dc.identifier.othervt_gsexam:6460en_US
dc.identifier.urihttp://hdl.handle.net/10919/56970
dc.description.abstractDifferences in southern yellow pine (represented by Pinus taeda) and Douglas-fir (Pseudotsuga menziesii) mature and juvenile wood were examined in terms of density, chemical composition, surface energy, shear stress, % wood failure, and delamination. Density was measured using a QTRS density scanner. Loblolly pine contained a higher average density. Chemical composition was measured using the NREL standard for identifying the chemical composition of biomass. Southern yellow pine contained a higher % hemicellulose, lignin, and extractives. Douglas-fir had higher % cellulose than southern yellow pine. Surface energy was measured using the static sessile drop contact angle method and the acid/base approach. Southern yellow pine contained a lower average contact angle than Douglas-fir. Shear stress, % wood failure, and durability were measured using ASTM-D2559 with two adhesives, a one-part moisture cure polyurethane (PU), and a two-part ambient curing phenol-resorcinol-formaldehyde (PRF). Shear stress for southern yellow pine was affected the most by the type of growth regions at the bond (juvenile to mature wood) and the assembly times of the adhesives used. Douglas-fir shear stress was affected by the type of adhesive and the growth region at the bond. Delamination results demonstrated that when using PRF the southern yellow pine has less delamination statistically than Douglas-fir. Also, the growth region at the bond with both adhesives showed to impact delamination with juvenile to mature wood having less delamination than mature to mature wood.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectDelaminationen_US
dc.subjectSurface Energyen_US
dc.subjectShear Stressen_US
dc.subjectChemical Compositionen_US
dc.subjectDensityen_US
dc.titleInvestigating Differences in Douglas-fir and Southern Yellow Pine Bonding Propertiesen_US
dc.typeThesisen_US
dc.contributor.departmentForest Resources and Environmental Conservationen_US
dc.description.degreeMSen_US
thesis.degree.nameMSen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineForest Productsen_US
dc.contributor.committeechairZink-Sharp, Audreyen_US
dc.contributor.committeememberRenneckar, Scott Harolden_US
dc.contributor.committeememberFrazier, Charles Een_US


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