Influence of the viscosity of UF resins on the radial and tangential penetration into poplar wood and on the shear strength of adhesive joints
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Ivana Gavrilovic-Grmusa
,
Manfred Dunky
Abstract
This paper is the final part of a series reporting on the penetration (P) and bonding behaviour of urea-formaldehyde (UF) resins of different viscosities based on different degrees of condensation (DCs). The various resins were applied onto radial and tangential wood surfaces, and solid wood assemblies were prepared by hot pressing. Pt and Pr were observed by evaluation of photomicrographs of the bond lines. The mean and maximum depth of penetration was inversely proportional to the DC. The average depth of Pt was found to be slightly higher than Pr because of the abundance of pits on the radial walls. However, the maximum P was higher in radial direction, due to the elliptic shape of vessels in poplar as well as due to rays improving the resin flow. The lap shear strength (σm) of the same bonded assemblies was determined. Despite the fact that the wood failure always was very high, the σm increased with the better penetration of the resins with low viscosity. The higher strength values measured has been interpreted as a fortification effect of the interphase by bulk resin penetration, as cell wall penetration cannot be expected due to the large size of such resin molecules.
©2012 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- Review
- Comparative evaluation of different kinetic models for batch cooking: A review
- Original Papers
- Characteristics of prehydrolysis-kraft pulp fibers from Scots pine
- Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
- Optical properties of thermomechanical pulp (TMP) obtained from sulfite-pretreated Norway spruce with focus on two-photon spectral imaging (TPSI)
- Physicochemical properties of sodium lignosulfonates (NaLS) modified by laccase
- Determination of metal ions in single wood fiber by LA-ICP-MS
- Hydrolytic enzyme activity of EN113 standard basidiomycetes in the fermentation of lignocellulosic material and wood colonization
- Influence of the viscosity of UF resins on the radial and tangential penetration into poplar wood and on the shear strength of adhesive joints
- Development of soy-based adhesives for the manufacture of wood composite products
- Exploratory study on fatigue behaviour of laterally loaded, nailed timber joints, based on a dissipated energy criterion
- Young’s and shear moduli of glued laminated timber composed of different species obtained by a flexural vibration test
- Heartwood detection for Scotch pine by fluorescence image analysis
- The antagonistic properties of Trichoderma spp. inhabiting woods for potential biological control of wood-damaging fungi
- Investigation of copper solubilization and reaction in micronized copper treated wood by electron paramagnetic resonance (EPR) spectroscopy
- A genetic marker of 4-coumarate: coenzyme A ligase gene in the cinnamaldehyde-chemotype Cinnamomum osmophloeum
- Meetings
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