Effects of water glass and DMDHEU treatment on the colonisation of wood by Aureobasidium pullulans

Pfeffer, Antje; Dieste, Andrés; Mai, Carsten; Militz, Holger

doi:10.1007/s00107-010-0444-8

Cited by 18 publications

(9 citation statements)

References 19 publications

(14 reference statements)

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“…Siloxanes (e.g. methyl-or propyltriethoxysilane) have been of interest due to easy applicability via the sol-gel process and on account of the attained improvement in substrate properties, such as increased hydrophobization and fungal resistance (Mai and Militz 2004;Donath et al 2006a,b;Weigenand et al 2008; Van den Bulcke et al 2010;Pfeffer et al 2011;Baur and Easteal 2012;Ghosh et al 2012a,b;Pries et al 2012). Inorganic silicon compounds, such as salts of hexafluorosilicic acid, water glasses, or silicic acid gels, have been tested as well (Mai and Militz 2004;Pfeffer et al 2011).…”

Section: Introductionmentioning

confidence: 96%

Chemical improvement of surfaces. Part 4: Significantly enhanced hydrophobicity of wood by covalent modification with p-silyl-functionalized benzoates

Kaldun¹,

Dahle²,

Maus‐Friedrichs³

et al. 2015

Holzforschung

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One aim of this work was the chemical modification of surfaces of Scots pine (Pinus sylvestris L.) sapwood veneer chips by covalently bonded substances for improved hydrophobicity. The durable attachment of organosilyl moieties to the surface was in focus. Several benzotriazolyl-activated p-silylated benzoic acid derivatives were applied to the esterification of OH groups at different temperatures and reaction times. The reactions resulted in weight percent gains from 8% to 43% and corresponding quantities of covalently bonded organomaterials of 0.3-2.1 mmol g -1 wood. The hydrophobicity was significantly increased as indicated by contact angles from 121° to 142°. All modified wood samples were analyzed by attenuated total reflection-infrared, contact angle measurements, and X-ray photoelectron spectroscopy.Keywords: attenuated total reflection-IR (ATR-IR), contact angle (CA), covalent fixation, esterification, hydrophobization of wood surface, quantity of covalently bonded organomaterials (QCO), silicon, X-ray photoelectron spectroscopy (XPS)

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Section: Introductionmentioning

confidence: 96%

Chemical improvement of surfaces. Part 4: Significantly enhanced hydrophobicity of wood by covalent modification with p-silyl-functionalized benzoates

Kaldun¹,

Dahle²,

Maus‐Friedrichs³

et al. 2015

Holzforschung

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“…The impregnation solutions were selected focusing on environmentally nontoxic agents with different compositions. The selected solutions have previously been found to give improved wood properties (Hansmann et al 2006, Temiz et al 2008, Ghosh et al 2009, Pfeffer et al 2010. The major motivation for this study was enhancement of the mechanical properties of heat-treated wood.…”

Section: Introductionmentioning

confidence: 98%

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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“…It is also possible that Levasil 200S inhibits the penetration of fungal hyphae through the wood specimens. Similar tests of water glass-treated specimens revealed high resistance to staining, which was attributed to the high alkalinity (pH 10 -12) of the specimens (Pfeffer et al 2011 ). Strong reduction of blue stain colonization was also observed with wood treated with amino siloxane (Ghosh et al 2009 ).…”

Section: Blue Stainmentioning

confidence: 70%

Treatment of wood with silica sols against attack by wood-decaying fungi and blue stain

Pries

Mai²

2013

Holzforschung

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Pine sapwood was treated with various types of silica sols. Whereas alkaline sols were not able to penetrate deeper into wood, neutral and acidic sols showed good penetration. The weight percent gain of treated specimens amounted to 20 -25 % ; bulking was negligible or even slightly negative. All silica sols in the treated specimens were stable against water leaching. A water submersion test revealed hydrophobation of the wood only after treatment with a cationic silica sol; all other silica sols increased the rate of water uptake. The addition of 2 % cationic sol to a malt-agar growth medium caused growth inhibition of 40 -50 % of the wood decay fungi Coniophora puteana and Trametes versicolor , whereas the other silica sols did not inhibit growth. Pine sapwood and beech wood blocks treated with the cationic sol showed a strong reduction in mass loss compared to the control samples after incubation with C. puteana (pine) and T. versicolor (beech) according to EN 113 and CEN/TS 15083-1; all other silica sols did not inhibit fungal decay. The cationic silica sol reduced blue staining by Aureobasidium pullulans compared to the untreated control but did not fully prevent it; all other silica sols did not inhibit blue staining.

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Effects of water glass and DMDHEU treatment on the colonisation of wood by Aureobasidium pullulans

Cited by 18 publications

References 19 publications

Chemical improvement of surfaces. Part 4: Significantly enhanced hydrophobicity of wood by covalent modification with p-silyl-functionalized benzoates

Chemical improvement of surfaces. Part 4: Significantly enhanced hydrophobicity of wood by covalent modification with p-silyl-functionalized benzoates

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

Treatment of wood with silica sols against attack by wood-decaying fungi and blue stain

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