Uptake of chitosan based impregnation solutions with varying viscosities in four different European wood species

Larnøy, Erik; Militz, Holger; Eikenes, Morten

doi:10.1007/s00107-005-0014-7

Cited by 27 publications

(17 citation statements)

References 10 publications

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“…The excellent impregnation of the melamine samples may be due to the lower viscosity of the modifier. Viscosity has been found to affect the uptake of a solution (Larnøy et al 2005, Dubey et al 2011, especially in pine wood (Tondi et al 2013).…”

Section: Treatmentmentioning

confidence: 99%

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Lahtela

Kärki

2014

Wood Material Science & Engineering

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Wood modification, of which thermal modification is one of the best-known methods, offers possible improvement in wood properties without imposing undue strain on the environment. This study investigates improvement of the properties of heat-treated solid wood. Scots pine (Pinus sylvestris) was modified in two stages: impregnation with modifiers followed by heat treatment at different temperatures. The impregnation was done with water glass, melamine, silicone, and tall oil. The heat treatment was performed at the temperatures of 180°C and 212°C for three hours. The modified samples were analyzed using performance indicators and scanning electron microscope micrographs. The mechanical and physical properties were determined with water absorption, swelling, bending strength, and impact strength tests. All the modifiers penetrated better into sapwood than hardwood; however, there were significant differences in the impregnation behavior of the modifiers. As regards the effect of heat treatment, generally the moisture properties were improved and mechanical strengths impaired with increasing treatment temperature. In contrast to previous studies, the bending strength increased after melamine impregnation and mild heat treatment. It is concluded that the properties of impregnated wood can be enhanced by moderate heat treatment.

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Section: Treatmentmentioning

confidence: 99%

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Lahtela

Kärki

2014

Wood Material Science & Engineering

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“…than in the tangential direction (Nicholas 1973;Larnøy et al 2005). The highest water uptake proceeds in the longitudinal direction, mainly through tracheids that are linked via bordered pits.…”

Section: Figurementioning

confidence: 99%

Creating water-repellent effects on wood by treatment with silanes

2006

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Three types of silanes were tested for their ability to impart hydrophobicity to solid wood samples: a tetraalkoxy silane bearing four hydrolysable alkoxy groups; two alkyl-trialkoxy silanes; and two multifunctional oligomeric silane systems. The first two types were applied as monomeric silane solutions and pre-condensed sols. The water uptake of treated wood was considerably reduced, especially after treatment with multifunctional waterborne silane systems, while uptake of gaseous water was not changed. Initial water repellence was most pronounced when a fluoro-alkyl functional oligomeric silane system was used; however, after a longer submersion time (24 h), the reduction in water uptake was strongly diminished. Wetting-drying cycles led to a reduction in hydrophobicity of samples treated with sols of alkoxysilanes, while aqueous functional silanes revealed enhanced water-repellent effects after these tests. This was explained by continued condensation of unreacted silanol groups in the aqueous functional silanes during the wetting-drying cycles. X-Ray mapping of silicon (SEM-EDX) showed that the reduction in water uptake due to the multifunctional silane HS 2909 is caused by plugging of the main penetration pathways such as pits, ray cells and ray tracheids.

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“…They also found that high molecular chitosan gave a better antifungal effect than low molecular chitosan. Larnøy et al (2005) described the limitations in penetration of high molecular weight chitosan in wood, and the tradeoff between high uptake and proper fixation was discussed. As molecular weight is an important factor when impregnating wood with chitosan, it was of interest to study different molecular weights of chitosan in the cell wall of pine.…”

Section: Introductionmentioning

confidence: 99%

Detection of chlorine-labelled chitosan in Scots pine by energy-dispersive X-ray spectroscopy

Larnøy¹,

Eikenes²,

Militz

2010

Wood Sci Technol

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The aim of this study was to use energy-dispersive X-ray spectroscopy (EDX) to localize chitosan in the cell wall of chitosan-impregnated Scots pine. It was of interest to investigate the concentration of chitosan in wood to gain further knowledge and understanding of the distribution of chitosan in the wooden matrix. After deacetylation, chitosan was re-acetylated with chloroacetic anhydride to achieve a covalent bonding of chloride to the chitosan polymer. Chloride-labelled chitosan was measured by EDX using a scanning electron microscope and described as chloride intensity. Analysis of free chloride anions was performed by dialysis and inductively coupled plasma atomic emission spectroscopy. There was a significant correlation between the molecular weight of chitosan and the intensity of covalentbonded chloride to the chitosan polymer. High molecular weight chitosan showed a better interaction with the cell wall structure than low molecular chitosan.

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Uptake of chitosan based impregnation solutions with varying viscosities in four different European wood species

Cited by 27 publications

References 10 publications

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Creating water-repellent effects on wood by treatment with silanes

Detection of chlorine-labelled chitosan in Scots pine by energy-dispersive X-ray spectroscopy

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