Functionalized Surface Layer on Poplar Wood Fabricated by Fire Retardant and Thermal Densification. Part 2: Dynamic Wettability and Bonding Strength

UBC Faculty Research and Publications

Functionalized Surface Layer on Poplar Wood Fabricated by Fire Retardant and Thermal Densification. Part 2: Dynamic Wettability and Bonding Strength Chu, Demiao; Mu, Jun; Avramidis, Stavros; Rahimi, Sohrab; Liu, Shengquan; Lai, Zongyuan

Abstract

In continuation of our former study on a novel combined treatment of nitrogen–phosphorus fire retardant and thermomechanical densification on wood, this study focuses on the dynamic wettability and the bonding strength. The contact angle was measured using the sessile drop method and the surface energy was calculated according to the van Oss method. Water surface penetrating and spreading is analyzed by both the Shi and Gardner model and the droplet volume changing model. The results reveal that the combined treatment increased the surface energy, especially the acid–base component. The contact angle declined and the water droplet spread more easily on the surface. Meanwhile, the rate of relative droplet volume decreased by 32.6% because the surface layer was densified and stabilized by the combined process. Additionally, the surface possesses the lowest roughness and highest abrasion resistance on the tangential section. Thus, the bonding strength of the combined treated poplar decreased by 29.7% compared to that of untreated poplar; however, it is still 53.3% higher than that of 220 °C heat-treated wood.

Item Metadata

Title	Functionalized Surface Layer on Poplar Wood Fabricated by Fire Retardant and Thermal Densification. Part 2: Dynamic Wettability and Bonding Strength
Alternate Title	Dynamic Wettability and Bonding Strength, Part 2
Creator	Chu, Demiao; Mu, Jun; Avramidis, Stavros; Rahimi, Sohrab; Liu, Shengquan; Lai, Zongyuan
Publisher	Multidisciplinary Digital Publishing Institute
Date Issued	2019-11-05
Description	In continuation of our former study on a novel combined treatment of nitrogen–phosphorus fire retardant and thermomechanical densification on wood, this study focuses on the dynamic wettability and the bonding strength. The contact angle was measured using the sessile drop method and the surface energy was calculated according to the van Oss method. Water surface penetrating and spreading is analyzed by both the Shi and Gardner model and the droplet volume changing model. The results reveal that the combined treatment increased the surface energy, especially the acid–base component. The contact angle declined and the water droplet spread more easily on the surface. Meanwhile, the rate of relative droplet volume decreased by 32.6% because the surface layer was densified and stabilized by the combined process. Additionally, the surface possesses the lowest roughness and highest abrasion resistance on the tangential section. Thus, the bonding strength of the combined treated poplar decreased by 29.7% compared to that of untreated poplar; however, it is still 53.3% higher than that of 220 °C heat-treated wood.
Subject	combined treatment; wettability; surface free energy; bonding strength; poplar
Genre	Article
Type	Text
Language	eng
Date Available	2019-11-22
Provider	Vancouver : University of British Columbia Library
Rights	CC BY 4.0
DOI	10.14288/1.0385830
URI	http://hdl.handle.net/2429/72357
Affiliation	Forestry, Faculty of; Non UBC; Wood Science, Department of
Citation	Forests 10 (11): 982 (2019)
Publisher DOI	10.3390/f10110982
Peer Review Status	Reviewed
Scholarly Level	Faculty
Rights URI	https://creativecommons.org/licenses/by/4.0/
Aggregated Source Repository	DSpace

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