Sorption Properties of Wood Impregnated with Boron Compounds, Sodium Chloride and Glucose

Lesar, Boštjan; Gorišek, Željko; Humar, Miha

doi:10.1080/07373930802565947

Cited by 29 publications

(30 citation statements)

References 12 publications

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“…Wood impregnated with boron compounds (boric acid [Ba]or borax) is more hygroscopic than untreated wood, particularly in high relative air humidity (RH). The increase in equilibrium moisture content (EMC) of such wood depends on the type of wood preservative used, retention, and wood species 18, 19. An EMC is problematic because of the more prominent leaching of active ingredients, creating favorable conditions for the growth of fungi, particularly molds, and because there are difficulties related to surface treatment and gluing of the moist wood.…”

Section: Introductionmentioning

confidence: 99%

Sorption properties of wood impregnated with aqueous solution of boric acid and montan wax emulsion

Lesar

Straže

Humar

2010

J of Applied Polymer Sci

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Nonbiocidal techniques for wood protection have become more and more important in the last few years. One of the possible treatments to enhance wood durability is use of water repellents. In this research, the influence of one of the possible water repellents, the montan wax emulsion, on the moisturizing and the sorption characteristics of impregnated wood was investigated. To achieve a better protection against wood decay fungi, wood was impregnated with montan wax emulsion enriched with boric acid. The equilibrium moisture content (MC) was monitored during the adsorption and the desorption processes at five levels of relative air humidity (RH 1 ¼ 20%, RH 2 ¼ 33%, RH 3 ¼ 65%, RH 4 ¼ 88%, and RH 5 ¼ 98%). Water repellence efficiency was monitored in the chamber with high RH (87%) and during dipping in the water. Impregnated samples were also exposed outdoors in a covered position for 5 months to determine MC changes according to changes in outdoor humidity and temperature. The results showed that the sorption properties of the impregnated wood are strongly related to retention of preservative solutions after impregnation and its composition. Montan wax reduced equilibrium MC of the impregnated wood up to 25% (relatively), whereas specimens impregnated with combination of montan wax and boric acid resulted in decreased MC in some cases and in increased MC in some cases. The Guggenheim-Andersen-deBoer model of sorption isotherms was fitted to experimental data to explain the sorption mechanisms.

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Section: Introductionmentioning

confidence: 99%

Sorption properties of wood impregnated with aqueous solution of boric acid and montan wax emulsion

Lesar

Straže

Humar

2010

J of Applied Polymer Sci

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“…This phenomenon reflects that boron and copper compounds in impregnated wood are slightly hygroscopic. Furthermore, there were several voids formed that allowed capillary condensation, which resulted in higher moisture contents of impregnated wood (Ramos et al 2006;Lesar et al 2009). Table 1 and Table 2.…”

Section: Water Vapor Uptake In Water Saturated Atmospherementioning

confidence: 99%

Influence of Artificial and Natural Weathering on the Moisture Dynamic of Wood

Žlahtič¹,

Humar²

2016

BioResources

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Wood that is used in outdoor applications is frequently exposed to weathering and is thus prone to fungal degradation. Ways to prevent fungal degradation include keeping the wood dry. The majority of hydrophobic and wood modification systems have been tested only on freshly treated wood. Little information is available on how various woodbased materials perform after a certain period of weathering. To elucidate this question, 17 wood samples were tested from the following species: oak (Quercus), sweet chestnut (Castanea sativa), European larch (Larix decidua), Scots pine heartwood and sapwood (Pinus sylvestris), Norway spruce (Picea abies), and beech (Fagus sylvatica). Moisture performance of the wood samples was improved with thermal modification, wax, oil, and biocide treatment. Specimens were exposed to various degradation-aging factors (blue stain fungi, decay fungi, artificial weathering, and natural weathering). Various moisture performance tests were applied before and after aging: short-term water uptake (tensiometer), long-term water uptake, water vapor tests, drying tests, etc. The water exclusion efficacy of wood was decreased after aging. Aging factors were found to act synergistically and to have a more prominent influence on less durable wood compared to durable or preservative-treated wood. Wax-treated wood performed best, regardless of which moisture performance test was applied.

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“…This effect is probably due to the addition of additives (ammonium polyphosphate, borate and boric acid) that changed the saturation of water vapour in the air, and not due to the addition of binding fibres (cf. Kollmann and Schneider 1959;Seifert 1972;Lesar et al 2009). …”

Section: Sorptionmentioning

confidence: 99%

“…In recent years, investigations have been carried out on diverse natural fibres, not only for use as insulating material but also for polymer composite material (Alix et al 2009;Bessadok et al 2009;Hill et al 2009). Diverse factors such as the manufacturing method (Seifert 1972), the treatment of the fibres ) and the additives (Kollmann and Schneider 1959;Scheiding 1998;Lesar et al 2009) influence the sorption of natural fibres and fibreboards. The Hailwood-Horrobin model is often used to characterise the sorption isotherms of wood and adequately describes the sorption of other natural fibres (Hill et al 2009), and is used for modelling moisture transport in wood (e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermal and moisture flux in soft fibreboards

Sonderegger

Niemz

2010

Eur. J. Wood Prod.

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The thermal conductivity of several wet and dry processed industrial soft fibreboards was determined at temperatures between 10°C and 30°C. Additionally, the thermal conductivity was tested relative to the moisture content ranging from an oven-dry sample to a moisture content of 85% relative humidity. Furthermore, the water vapour diffusion was investigated to determine the resistance factor and the diffusion coefficient under 'dry cup' and 'wet cup' conditions and the sorptions were tested by means of the sorption isotherms.The thermal conductivity increases with increasing temperature at about 0.45% per Kelvin and with increasing moisture at about 0.17 × 10 −2 W/mK per percent volumetric moisture content. Furthermore, the thermal conductivity depends on the manufacture (dry or wet process) and is influenced by density. The water vapour resistance factor increases and the diffusion coefficient decreases with increasing density. Both factors decrease with increasing moisture content and they are dependant on board thickness, composition and manufacturing. The sorption isotherm is similar to solid wood below about 80% relative humidity but strongly increases for soft fibreboards with binding fibres and additives of ammonium phosphate or sodium borate and boric acid when above 80% relative humidity. Wärme-und Feuchteverhalten poröser HolzfaserplattenZusammenfassung An verschiedenen, nach dem Nassoder nach dem Trockenverfahren, industriell hergestellten

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Sorption Properties of Wood Impregnated with Boron Compounds, Sodium Chloride and Glucose

Cited by 29 publications

References 12 publications

Sorption properties of wood impregnated with aqueous solution of boric acid and montan wax emulsion

Sorption properties of wood impregnated with aqueous solution of boric acid and montan wax emulsion

Influence of Artificial and Natural Weathering on the Moisture Dynamic of Wood

Thermal and moisture flux in soft fibreboards

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