The wettability and bonding performance of densified VTC beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) Karst.) bonded with phenol–formaldehyde adhesive and liquefied woodBenetzbarkeit und Verklebungsverhalten von verdichtetem VTC Buchen- (Fagus sylvatica L.) und Fichtenholz (Picea abies (L.) Karst.), das mit Phenol-Formaldehydharz und Flüssigholz verklebt wurde

被引：0
作者：
Ugovšek Aleš
Frederick A. Kamke
Milan Sernek
Matjaž Pavlič
Andreja Kutnar
机构：
[1] University of Ljubljana,Department of Wood Science and Technology, Biotechnical Faculty
[2] Oregon State University,Department of Wood Science and Engineering
[3] University of Primorska,Andrej Marušič Institute
[4] ILTRA d.o.o.,undefined
来源：
European Journal of Wood and Wood Products | 2013年 / 71卷 / 3期
关键词：
Contact Angle; Shear Strength; Densified Wood; Fagus Sylvatica; Wood Surface;
D O I：
10.1007/s00107-013-0669-4
中图分类号：
学科分类号：
摘要：
The influence of viscoelastic thermal compression (VTC) on surface wettability and bonding performance of wood was evaluated. Low quality beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) Karst.) were densified with the VTC process to different degrees of densification. Control and densified strips were bonded with phenol–formaldehyde (PF) adhesive and liquefied wood (LW). Shear strength of bonded assemblies was determined after 1 week of conditioning at 20 °C and relative humidity of 65 %. Wettability was determined on the basis of the contact angle of water, PF adhesive, and LW using the Wilhelmy method. Results showed that densification of beech and spruce wood did not significantly affect the shear strength of specimens bonded with PF adhesive. In beech assemblies bonded with LW shear strength decreased significantly with increased density, whereas in bonded spruce specimens decrease of shear strength was not significant. It was found that degree of densification and bonding process used in the study were not appropriately chosen for spruce wood specimens, since major deformations after the bonding process occurred. Wettability changed significantly after densification. Contact angle of water and LW increased after densification, whereas contact angle of PF showed inverse trend and decreased after VTC process. Furthermore, the degree of densification had a minor effect on the wettability.
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页码：371 / 379
页数：8
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