Tannin-caprolactam and Tannin-PEG formulations as outdoor wood preservatives: weathering properties

Tondi, Gianluca; Hu, Jinbo; Rizzo, Filippo; Buh, Janez; Medved, Sergej; Petutschnigg, Alexander; Thévenon, Marie-France

doi:10.1007/s13595-016-0605-y

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…Treated and untreated wood samples (5 mm × 20 mm × 20 mm, n = 18-30) were placed in different flasks containing a volume of water at least five-fold their volume. Flasks were placed on a plate stirrer and subjected to different leaching periods (1,2,4,8,16, and 48 h) with a change of water between each period. The wood samples were kept without water for 16 h after the period of 4 h. At the end of the leaching periods, the wood samples were dried at 103 • C for 48 h and weighed (m 3 ).…”

Section: Wood Modificationmentioning

confidence: 99%

“…Due to their chemical structure, tannins are often considered as an alternative to phenol, produced using petrochemistry, for the preparation of thermoset resins. However, due to their low reactivity with wood, tannins, and especially condensed tannins, necessitate the addition of cross-linkers or other reactive chemicals or additives to develop wood modification treatments [1][2][3][4]. Utilization of a high weight ratio of tannins towards the cross-linkers and low concentration of the impregnating solution to modify wood lead to only small improvement in the properties of modified wood, particularly in terms of dimensional stability, leaching resistance, and decay durability.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Tannins Addition on Thermal Stability of Furfurylated Wood

et al. 2023

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This article presents the effect of the addition of condensed tannins, used as a reticulation agent, on the polymerization of furfuryl alcohol during wood furfurylation, as well as the effect of these condensed tannins on the thermal stability of modified wood. Three kinds of dicarboxylic acids (adipic acid, succinic acid, and tartaric acid), as well as glyoxal, used as model of a wood reticulation agent, were used to catalyze the polymerization of furfuryl alcohol or tannin-furfuryl alcohol solutions. Impregnation of furfuryl alcohol or tannin-furfuryl alcohol solution into the wood, followed by curing at 103 °C for a specific duration, was performed for the wood modification. The thermal stability of the obtained tannin-furfuryl alcohol polymers and their corresponding modified woods was investigated. The leaching resistance and dimensional stability of the modified woods were also evaluated. Results indicated that the partial substitution of furfuryl alcohol by the tannins improved the polymerization reactivity in conditions where furfuryl alcohol alone did not lead to the formation of a solid polymeric material. The thermal stability and leaching resistance of the furfurylated wood in the presence of tannins were improved. Dimensional stability was also improved for furfurylated samples, but the effect of tannin addition was not so obvious, depending on the acidic catalyst used.

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Section: Wood Modificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Tannins Addition on Thermal Stability of Furfurylated Wood

et al. 2023

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“…Tannins, a well-known phenolic rich biomolecule derived from the higher plants, have been used for many applications, such as adhesives, composites, pharmaceuticals, medicals, food and beverage products [1][2][3][4]. Due to their low reactivity to the wood, tannins, particularly the condensed tannins, have been used for wood modification with the addition of cross-linkers or other reactive chemicals or additives, such as furfuryl alcohol, hexamine, formaldehyde, maleic anhydride, glyoxal, furfural, caprolactam, or lactic acid [5][6][7][8][9][10]. However, utilization of high weight ratio of tannins towards the cross-linkers and low concentration of the impregnating solution lead to modified wood with limited properties, particularly in terms of dimensional stability, leaching resistance, and biological durability [6].…”

Section: Introductionmentioning

confidence: 99%

Modification of Wood by Tannin-Furfuryl Alcohol Resins–Effect on Dimensional Stability, Mechanical Properties and Decay Durability

Mubarok¹,

G閞ardin-Charbonnier²,

Azadeh³

et al. 2023

Journal of Renewable Materials

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Furfurylation is a well-known wood modification technology. This paper studied the effect of tannin addition on the wood furfurylation. Three kinds of dicarboxylic acids, adipic acid, succinic acid, and tartaric acid, as well as glyoxal as a comparing agent, were used to catalyse the polymerisation of furanic or tannin-furanic solutions during wood modification. Impregnation of furanic or tannin-furanic solution at a certain concentration into the wood followed with curing at 103°C for a specific duration was performed for the wood modification. Different properties of the modified woods like dimensional stability, resistance of treatment to leaching, mechanical properties, decay durability against white-rot (Coriolus versicolor, Pycnoporus sanguineus) and brown-rot (Coniophora puteana) as well as their chemical and anatomical characteristics were evaluated. Results revealed that the partial substitution of FA by the tannins improved the fixation of the chemicals impregnated in wood. Further, dimensional stability, leaching resistance, Brinell hardness, modulus of elasticity/modulus of rupture, and decay durability properties of the furfurylated wood were also improved in the presence of tannins. Scanning electron microscopy revealed the deposition of the polymer in the wood lumen cells and in the wood cell walls.

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“…7 With respect to applications in wood preservation, a formulation of tannin-PEG was also to study weathering properties using Fouriertransform infrared (FT-IR) and 13 C solution nuclear magnetic resonance (NMR) spectroscopies. 8 PEG was also used as a graing reagent to stabilize the dimensions of a cellulose microcrystal suspension. 9 Furthermore, the manufacture of wood polymer composites (WPC) is an important industrial topic.…”

Section: Introductionmentioning

confidence: 99%