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Bending property enhancement of wood strand composite using viscoelastic thermal compression

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dc.contributor.advisor Kamke, Frederick A
dc.creator Rathi, Vardan M.
dc.date.accessioned 2009-04-22T23:14:53Z
dc.date.available 2009-04-22T23:14:53Z
dc.date.copyright 2009-03-20
dc.date.issued 2009-04-22T23:14:53Z
dc.identifier.uri http://hdl.handle.net/1957/11354
dc.description Graduation date: 2009 en_US
dc.description.abstract The fundamental intent of the study was to develop an innovative wood-strand composite for use in structural applications. Plantation grown, low density, hybrid poplar was used in the study which was found to be appropriate for the underlying Viscoelastic Thermal Compression (VTC) process. Wood modified by this process has high density and a proportional increase in its flexural strength and stiffness. The VTC process increases the density of wood in the presence of steam, which acts as a plasticizer, mechanical compression and high temperature. Steam pressure is manipulated to induce the mechanosorptive effect during VTC processing, increasing density without fracturing the cell walls. There were three components of this research project. Firstly, the scale-up VTC device was successfully constructed to process samples of dimension: 61 x 25 cm (24" x 10"). Secondly, the influence of high density VTC wood strands in an oriented strand composite was evaluated. The novelty of this objective was that the overall panel density was not increased. Lastly, a three-layer laminated composite was made, where the lamina were comprised of wood strand panels that were VTC processed prior to lamination. Both methods of VTC composite manufacture improved bending properties in comparison to control specimens. Two treatments were studied for the VTC strand composites. The treatments included the addition of 20% and 40% of VTC strands, by weight, oriented on the surface of the panel. Panels with 20% by weight of VTC strands oriented on the surface showed no statistically significant increase of MOE and MOR. The addition of 40% VTC strands improved the MOE and MOR by 30% and 18%, respectively. The MOE of the strand composites that were processed by VTC increased by approximately 150% to 160%. The VTC laminates were then bonded to produce the final three-layer product. Visual inspection revealed that the VTC process did not disrupt the phenol-formaldehyde bond. en_US
dc.language.iso en_US en_US
dc.subject VTC en_US
dc.subject OSB en_US
dc.subject.lcsh Engineered wood -- Formability en_US
dc.subject.lcsh Poplar -- Utilization en_US
dc.title Bending property enhancement of wood strand composite using viscoelastic thermal compression en_US
dc.type Thesis en_US
dc.degree.name Master of Science (M.S.) in Materials Science en_US
dc.degree.name Master of Science (M.S.) in Wood Science
dc.degree.level Master's en_US
dc.degree.discipline Wood Science en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Gupta, Rakesh
dc.contributor.committeemember Rochefort, Skip
dc.contributor.committeemember Simonsen, John
dc.contributor.committeemember Nairn, John

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