Chemical reaction of maritime pine sapwood (Pinus pinaster Soland) with alkoxysilane molecules: A study of chemical pathways

Sèbe, Gilles; Tingaut, Philippe; Safou-Tchiama, Rodrigue; Pétraud, Michel; Grelier, Stéphane; Jeso, B. De

doi:10.1515/hf.2004.078

Cited by 40 publications

(39 citation statements)

References 18 publications

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“…3). Silicone treated samples showed absorption bands at 1257 cm −1 assigned to ν(Si-C) stretch vibration, 1080 cm −1 and 1000 cm −1 assigned to skeletal vibrations δ(Si-O-Si) and 798 cm −1 assigned for ν(Si-C) and/or ν(Si-O) (Noll 1968, Sèbe et al 2004, Tinguat et al 2005, Zollfrank and Wegener 2002, Zollfrank 2001. After weathering the lignin band at 1505 cm −1 disappeared due to UV degradation, whereas the intensity of the silicone bands did not diminish (Fig.…”

Section: Blue Stainmentioning

confidence: 99%

The efficacy of commercial silicones against blue stain and mould fungi in wood

2009

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Scots pine (Pinus sylvestris L.) samples were vacuum pressure impregnated with quaternary ammonium (quat)-silicone micro-emulsion (<40 nm particle size), amino-silicone macro-emulsion (110 nm) and silicone macro-emulsion with alkyl modified side groups (740 nm). Quat-silicone micro-emulsion caused highest cell wall bulking (4.8%) and anti-swelling efficiency (21.8%) in wood when treated with 30% concentration of silicone in the treatment solution. All three formulations made wood hydrophobic which was evident from a capillary (longitudinal, tangential and radial) water uptake test. Amino-silicone macro-emulsion (10% silicone in treatment solution) resulted in strong resistance to blue stain attack with both pre-weathered and not pre-weathered wood samples. Signs of blue staining were more evident on the pre-weathered samples. Treatment with amino-silicone macro-emulsion (10% silicone in treatment solution) resulted in a certain resistance to mould growth on wood surfaces, whereas wood treated with the same concentration of quat-silicone microemulsion and alkyl-modified silicone macro-emulsion exhibited comparatively lower resistance. Die Wirksamkeit kommerzieller Silicone gegenüber Bläue-und Schimmelbefall auf HolzZusammenfassung Kiefernholzproben (Pinus sylvestris L.) wurden unter Vakuum-Druck mit Emulsionen von drei Silicontypen imprägniert: der Mikro-Emulsion eines Sili-S. C. Ghosh · H. Militz · C. Mai (u) Wood Biology and Wood Products, Burckhardt Institute, Georg-August University, Büsgenweg 4, 37077 Göttingen, Germany e-mail: cmai@gwdg.de cons mit quaternären Ammoniumgruppen (Quat-Silicon, <40 nm Partikelgröße), der Makro-Emulsion eines AminoSilicons (110 nm) und der Makro-Emulsion eines Silicons mit alkyl-modifizierten Seitengruppen (740 nm). Die Mikro-Emulsion des Quat-Silicons verursachte die höchste Zellwandausdehnung (,,Bulking", 4,8%) und Quellvergü-tung (,,ASE", 21,8%) bei Holzproben, die mit 30%iger Siliconlösung behandelt wurden. Eine Untersuchung der kapillaren Wasseraufnahme (longitudinal, tangential und radial) machte deutlich, dass alle drei Formulierungen das Holz hydrophobieren.Die Makro-Emulsion des Amino-Silicons (10% SiliconKonzentration in der Behandlungslösung) bewirkte sowohl bei vorbewitterten als auch bei nicht vorbewitterten Proben eine hohe Resistenz gegenüber Bläuebefall. Hierbei war der Bläuebefall auf den vorbewitterten Proben deutlicher zu erkennen. Die Behandlung mit der Makro-Emulsion des Amino-Silicons (10% Silicon-Konzentration in der Behandlungslösung) ergab eine gewisse Resistenz gegenüber Schimmelbefall auf Holzoberflächen, während Hölzer, die mit der Mikro-Emulsion des Quat-Silicons und der MakroEmulsion des alkyl-modifizierten Silicons behandelt wurden, eine vergleichsweise geringe Resistenz aufwiesen.

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Section: Blue Stainmentioning

confidence: 99%

The efficacy of commercial silicones against blue stain and mould fungi in wood

2009

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“…Indeed, several studies have focused on etherification and esterification reactions between treatment chemical solutions and wood hydroxyl groups: formaldehyde resins (Goldstein et al 1959;Inoue et al 1993;Lukowsky 2002), dimethyloldihydroxyethyleneurea (DMDHEU) (Weaver et al 1960;Van Acker et al 1999); furfural alcohol (Westin et al 2004); maleic acid and glycerin (Uraki et al 1994); and citric acid (Hasan et al 2012). In addition to these reactions (etherification and esterification), bulking of the wood cell walls with hydrophobic polymers has been found to improve dimensional stability using organosilicone or alkoxysilane molecules (Sèbe and De Jéso 2000;Sèbe et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Pine Wood Treated with a Citric Acid and Glycerol Mixture: Biomaterial Performance Improved by a Bio-byproduct

et al. 2016

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Wood material is a good reservoir for biogenic carbon storage. The use of wood material for outdoor products such as siding in the building construction sector presents limits. These limits are bound to the nature of wood material (hygroscopic property and anatomical structure). They are responsible for the dimensional variation associated with moisture content variations. Fungal attacks and coating layers adhesion on wood surface, are other problems. This research investigated the feasibility of impregnation with environmentally friendly chemicals, i.e., a citric acidglycerol mixture (CA-G). The anti-swelling efficiency (ASE), hardness, biodegradation, and coating adhesion tests were performed on softwood specimens. ASE results were up to 53%. The equilibrium moisture content of the treated specimens was less than half of the untreated ones. FTIR spectroscopy showed bands at 1720 to 1750 cm -1 , indicating the presence of ester bonds, and scanning electron microscopy images confirmed the polymerization and condensation of treatment solution inside the wood structure. Hardness and decay resistance were increased; however, treatment reduces coating adhesion. In conclusion, CA-G represents a promising eco-responsible solution for improving the technical performance of outdoor wood products.

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“…However, release of formaldehyde, a carcinogenic volatile organic compound (VOC), in the atmosphere is an environmental and human health issue. Treatments with dimethylol dihydroxy ethylene urea (DMDHEU), furfuryl alcohol, organo-silane, maleic acid, and glycerol have been the subject of several studies (Goldstein et al 1959;Weaver et al 1960;Inoue et al 1993;Uraki et al 1994;Van Acker et al 1999;Sèbe and De Jéso 2000;Lukowsky 2002;Sèbe et al 2004;Westin et al 2004). Wood treatment with carboxylic acids is based on the same principle as that for the anhydrides, which is a nucleophilic substitution on the acyl carbon.…”

Section: Introductionmentioning

confidence: 99%

Maleic Anhydride Treated Wood: Effects of Drying Time and Esterification Temperature on Properties

Essoua¹,

Blanchet²,

Landry³

et al. 2015

BioResources

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To improve technical performance of wood siding, treatment with maleic anhydride was applied. The effects on technical performance of drying time and esterification temperature parameters were analyzed. Wood samples of lodgepole pine and white pine were treated and tested. Results indicated that treatment improves technical performance of wood (dimensional stability, fungal degradation resistance, and accelerated aging). FTIR spectroscopy analysis showed spectra with peaks at 1750 to 1730 cm -1 . These correspond to ester bonds formed between wood hydroxyl groups and MA carboxylic acid groups. SEM images indicate that the MA quantity in wood cavities was increased with decreasing esterification temperature. Weight percent gain (WPG) increased with decreasing time and temperature of esterification. Artificial aging and fungal degradation performances were monitored using FTIR analysis. Esterification temperature had no important effect on fungal degradation. Weight loss after fungal exposure of treated samples was not only due to fungal action but also due to evaporation of MA during the drying step. Regarding artificial aging, degradation of wood components and ester bonds were less for samples esterified at 180 °C than those esterified at 160 °C or 140 °C.

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Chemical reaction of maritime pine sapwood (Pinus pinaster Soland) with alkoxysilane molecules: A study of chemical pathways

Cited by 40 publications

References 18 publications

The efficacy of commercial silicones against blue stain and mould fungi in wood

The efficacy of commercial silicones against blue stain and mould fungi in wood

Pine Wood Treated with a Citric Acid and Glycerol Mixture: Biomaterial Performance Improved by a Bio-byproduct

Maleic Anhydride Treated Wood: Effects of Drying Time and Esterification Temperature on Properties

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