Investigating Differences in Douglas-fir and Southern Yellow Pine Bonding Properties

Mirabile, Kyle Vincent

Investigating Differences in Douglas-fir and Southern Yellow Pine Bonding Properties

dc.contributor.author	Mirabile, Kyle Vincent	en
dc.contributor.committeechair	Zink-Sharp, Audrey G.	en
dc.contributor.committeemember	Renneckar, Scott Harold	en
dc.contributor.committeemember	Frazier, Charles E.	en
dc.contributor.department	Forest Resources and Environmental Conservation	en
dc.date.accessioned	2015-10-23T08:00:30Z	en
dc.date.available	2015-10-23T08:00:30Z	en
dc.date.issued	2015-10-22	en
dc.description.abstract	Differences 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
dc.description.degree	Master of Science	en
dc.format.medium	ETD	en
dc.identifier.other	vt_gsexam:6460	en
dc.identifier.uri	http://hdl.handle.net/10919/56970	en
dc.publisher	Virginia Tech	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	Delamination	en
dc.subject	Surface Energy	en
dc.subject	Shear Stress	en
dc.subject	Chemical Composition	en
dc.subject	Density	en
dc.title	Investigating Differences in Douglas-fir and Southern Yellow Pine Bonding Properties	en
dc.type	Thesis	en
thesis.degree.discipline	Forest Products	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	masters	en
thesis.degree.name	Master of Science	en