Envelope protection of preservative-treated pine decking with modified low molecular weight phenol formaldehyde resin
department or school: Forestry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Chan, Wing Fung George
issued: 2019-05-31T00:00:00
issued: 2018
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Preservative-treated pine is commonly used for outdoor decking in Canada and the United States, but its attractive appearance is lost when it is exposed to the weather. Wood can be protected from âweatheringâ using low molecular weight phenol formaldehyde (LMW PF) resin. In this thesis, I combine preservative treatments and modification of wood with PF resin to try to develop wood decking with superior resistance to weathering. My hypothesis is that shallow âenvelopeâ modification of treated wood with LMW PF resin containing photostabilizers and wax additives will protect the appearance of preservative-treated pine decking exposed to natural weathering. I first screened different additives for their ability to protect wood from the adverse effects of weathering. The best additives were selected for further testing. Preservative-treated Scots and southern pine boards were modified by dipping or vacuum impregnation with modified PF resins, and modified and treated boards were exposed to the weather. Envelope modification restricted checking of untreated pine boards weathered for two years. Degradation of modified boards was shallow and easily cleaned off. Underneath the weathered grey layer, the colour of PF-modified wood was retained. Envelope modification with different PF resin formulations also protected treated boards weathered for six months. Ferric chloride was a more effective additive than a lignin stabilizer for most substrates (treated or untreated). The dark colour of PF/ferric-modified wood masked mould. The different PF resins I tested improved the performance of treated wood to varying degrees, but their effectiveness depended on the substrate they were applied to. I conclude that: (1) envelope modification with PF and modified PF resins is able to protect treated decking from the adverse effects of weathering; (2) vacuum impregnation with PF resin is a better method than dipping at creating an effective weather-resistant envelope at the surface of trea…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/66366
note: ENVELOPE PROTECTION OF PRESERVATIVE-TREATED PINE DECKING WITH MODIFIED LOW MOLECULAR WEIGHT PHENOL FORMALDEHYDE RESIN by Wing Fung George Chan B.Sc. in Wood Products Processing, The University of British Columbia, 2012 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) June 2018 © Wing Fung George Chan, 2018 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, a thesis/dissertation entitled: Envelope Protection of Preservative-Treated Pine Decking with Modified Low Molecular Weight Phenol Formaldehyde Resin submitted by Wing Fung George Chan in partial fulfillment of the requirements for the degree of Master of Science in The Faculty of Graduate and Postdoctoral Studies (Forestry) Examining Committee: Dr Philip D. Evans, Wood Science Supervisor Dr Julie Cool, Wood Science Supervisory Committee Member Dr Simon C. Ellis, Wood Science Supervisory Committee Member Dr Feng Jiang, Wood Science Additional Examiner Dr Anthony Lau, Chemical and Biological Engineering Additional Examiner iii Abstract Preservative-treated pine is commonly used for outdoor decking in Canada and the United States, but its attractive appearance is lost when it is exposed to the weather. Wood can be protected from âweatheringâ using low molecular weight phenol formaldehyde (LMW PF) resin. In this thesis, I combine preservative treatments and modification of wood with PF resin to try to develop wood decking with superior resistance to weathering. My hypothesis is that shallow âenvelopeâ modification of treated wood with LMW PF resin containing photostabilizers and wax additives will protect the appearance of preservative-treated pine decking exposed to natural weathering. I first screened different additives for their ability to protect wood from the adverse…
has type: Thesis/Dissertation
date issued: 2018-09
is shown at: 10.14288/1.0368757
language: eng
degree discipline: Forestry
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/66366