Assessment of covalent bond formation between coupling agents and wood by FTIR spectroscopy and pull strength tests
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,
Abstract
In the focus was the question whether metal alkoxide coupling agents – titanium, silane, and zirconium – form covalent bonds to wood and how they improve coating adhesion. In a previous work, a downshift of the lignin infrared (IR) band ∼1600 cm-1 was shown to be consistent with the formation of ether linkages between lignin and titanium coupling agent. In the present work, changes were found in the attenuated total reflectance-Fourier transform IR (ATR-FTIR) spectra of lignin and wood mixed with silane, and titanium coupling agents, and to a lesser extent for a zirconium coupling agent. This was seen as evidence for covalent bonds between lignin phenolics and the coupling agents. No spectral changes were observed when the coupling agents were mixed with the wood constituents cellulose and hemicellulose. For verification of the results, a modified EN 311 wet adhesion pull strength test was performed with softwood panels painted with a solvent-borne alkyd/acrylic coating. The results revealed an improved adhesion for all tested coupling agents compared to the untreated reference. The spectroscopic and pull test results underline that the presence of the lignin moiety in wood is of central importance for improved wood coating adhesion.
Acknowledgments
This work was supported by funding from the Danish National Advanced Technology Foundation.
Conflict of interest statement
The authors declare that they have no conflict of interest.
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©2014 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp
- Synthesis and fundamental HSQC NMR data of monolignol β-glycosides, dihydromonolignol β-glycosides and p-hydroxybenzaldehyde derivative β-glycosides for the analysis of phenyl glycoside type lignin-carbohydrate complexes (LCCs)
- Iridoids from the stems of Viburnum erosum
- 6-Pentyl-α-pyrone as an anti-sapstain compound produced by Trichoderma gamsii KUC1747 inhibits the germination of ophiostomatoid fungi
- ESR studies on the free radical generation in wood by irradiation with selected sources from UV to IR wavelength regions
- Synthesis of aluminum hydroxide thin coating and its influence on the thermomechanical and fire-resistant properties of wood
- Lignin distribution in waterlogged archaeological Picea abies (L.) Karst degraded by erosion bacteria
- Assessment of covalent bond formation between coupling agents and wood by FTIR spectroscopy and pull strength tests
- Effect of hot water extracted hardwood and softwood chips on particleboard properties
- The interrelation between microfibril angle (MFA) and hygrothermal recovery (HTR) in compression wood and normal wood of Sugi and Agathis
- Chemical remediation of wood treated with micronised, nano or soluble copper preservatives
- Energetic investigation of the fatigue of wood
- Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process
- Short Note
- Properties of young Araucaria heterophylla (Norfolk Island pine) reaction and normal wood
- Effect of specimen configuration on the measurement of off-axis logarithmic decrement of solid wood measured by longitudinal and flexural vibration tests
Articles in the same Issue
- Frontmatter
- Original Articles
- Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp
- Synthesis and fundamental HSQC NMR data of monolignol β-glycosides, dihydromonolignol β-glycosides and p-hydroxybenzaldehyde derivative β-glycosides for the analysis of phenyl glycoside type lignin-carbohydrate complexes (LCCs)
- Iridoids from the stems of Viburnum erosum
- 6-Pentyl-α-pyrone as an anti-sapstain compound produced by Trichoderma gamsii KUC1747 inhibits the germination of ophiostomatoid fungi
- ESR studies on the free radical generation in wood by irradiation with selected sources from UV to IR wavelength regions
- Synthesis of aluminum hydroxide thin coating and its influence on the thermomechanical and fire-resistant properties of wood
- Lignin distribution in waterlogged archaeological Picea abies (L.) Karst degraded by erosion bacteria
- Assessment of covalent bond formation between coupling agents and wood by FTIR spectroscopy and pull strength tests
- Effect of hot water extracted hardwood and softwood chips on particleboard properties
- The interrelation between microfibril angle (MFA) and hygrothermal recovery (HTR) in compression wood and normal wood of Sugi and Agathis
- Chemical remediation of wood treated with micronised, nano or soluble copper preservatives
- Energetic investigation of the fatigue of wood
- Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process
- Short Note
- Properties of young Araucaria heterophylla (Norfolk Island pine) reaction and normal wood
- Effect of specimen configuration on the measurement of off-axis logarithmic decrement of solid wood measured by longitudinal and flexural vibration tests
