Your search resulted in 496 documents. Displaying 25 entries per page.
Water interactions in wood polyesterified with sorbitol and citric acid
2020 - IRG/WP 20-40888
Polyesterifcation of wood with sorbitol and citric acid seems to be a promising chemical wood modification technique that is both low-cost and produced from bio-based chemicals. An interesting aspect of the modification is the interaction of water with the polyesterified wood since the relationship with…
G Beck, A Treu, E Larnøy
A summary of decay performance with citric acid and sorbitol modification
2020 - IRG/WP 20-40898
…the potentials for esterification of sorbitol and citric acid in an aqueous-based modification process. This article summarises decay performance results from studies performed at NIBIO when using sorbitol and citric acid (PolySorb) for wood modification at different stages in the ongoing process development. Main…
G Alfredsen, E Larnøy, G Beck, J Biørnstad, L R Gobakken, C A S Hill, A Treu
Macro biological degradation of wood treated with sorbitol and citric acid – first results from marine environment and termite exposure
2020 - IRG/WP 20-40901
…of wood with a combination of sorbitol and citric acid (PS-modification) showed good resistance against wood borers in the marine environment after one season and against subterranean termites in the laboratory after eight weeks. Future results from the ongoing field tests in the marine environment will…
A Treu, L Nunes, E Larnøy
Natural durability of four Tunisian Eucalyptus wood species and their respective compositions in extractives
2019 - IRG/WP 19-10942
…But, it appears that it is mostly governed by gallic acid, fatty acid glycerides, fatty acid esters, phenolic compounds, sitosterol, catechin and quercetin.To conclude, Eucalyptus maidenii, Eucalyptus saligna, Eucalyptus camaldulensis and Eucalyptus gomphocephala woods could be used as material sources to…
S Ben Ayed, M T Elaieb, S Dumarçay, B De Freitas Homen De Faria, M-F Thévenon, P Gerardin, K Candelier
Coula edulis baill an unknown wood species as an alternative to the main durable wood species used in Gabon
2019 - IRG/WP 19-10945
…on extractives by GC-MS indicated the presence of gallic acid, quercetin and tannins.
C S A Bopenga Bopenga, S Dumarçay, P Edou Engonga, P Gerardin
Effectiveness of Gleditsia triacanthos heartwood extractives as wood protector
2019 - IRG/WP 19-10950
…to a concentration of 5% (w/w), and combined with boric acid (2%) and hexamine (1%).
Sapwood samples of Pinus taeda and Eucalyptus grandis were impregnated by vacuum – vacuum with the resulting mixture. The resistance of the treated wood was tested against two decay fungi, Coriolus versicolor and Gloeophyllum…
C M Ibanez, C Mantero, P Raimonda, X Pintos, E Pereira
Characterization of Pectinases from Brown-rot Fungus Fomitopsis palustris
2019 - IRG/WP 19-10951
…cooperation with other molecules. We presumed that oxalic acid plays an additional role when PG-A degrades pectin in wood. PG-A was found to be able to degrade calcium polygalacturonate gel in the presence of oxalic acid. Moreover, the thermal stability of PG-A was increased in oxalate buffer at pH 3.0 compared to…
Y Tanaka, N Konno, T Suzuki, N Habu
Identification of Antifungal Compounds in Konjac Flying Powder and Assessment against Wood Decay Fungi
2019 - IRG/WP 19-30737
…active fractions were mainly composed of organic acids and plant essential oils. Salicylic acid, 2,4,6-trichlorophenol and vanillin were presented in the active fractions. The preliminary results indicate that konjac extracts have potential as natural wood protectants. Further tests in wood are planned.
Z Bi, F Yang, Y Lei, J J Morrell, L Yan
Penetration pathway of oilborne preservative in heartwood of Japanese larch (Larix kaempferi)
2019 - IRG/WP 19-40886
…colored with Sudan black B and the water colored with acid fuchsin under atmospheric pressure, were observed with a stereo microscope and a light microscope. The affinity between the larch resin and the oilborne preservative was investigated by mixing them. The acidic fuchsin aqueous solution hardly penetrated…
H Shibui, T Miyauchi, T Shigeyama, M Ikeda, Y Sugai
Response of the symbiotic flagellate protists community of subterranean termites to sublethal amounts of biocides
2018 - IRG/WP 18-10911
…pH alteration agent and respiration inhibitor (boric acid), an essential oil (cloves) and its main constituent (eugenol), together with the solvent (water) and a positive control of pine wood. Termites were captured in three different zones of the same pine forest, sufficiently distant to be considered as…
S Duarte, T Nobre, P Borges, L Nunes
Evaluation of the effect of zwitterionic buffers on termite gut protists
2018 - IRG/WP 18-10933
…reduction is linked in varying degrees to the release of acidic volatile species, the acid-catalysed depolymerisation of the hemicelluloses present and the plasticization and redistribution of the lignin components present. Buffers, although been designed not to influence the reaction systems, may have some…
S Duarte, D Jones, L Nunes
Encapsulation of chlorothalonil with polylactic acid using nanoprecipitation method for rubberwood preservation
2018 - IRG/WP 18-30722
…treatment due to their poor water solubility. Polylactic acid (PLA) was employed to encapsulate chlorothalonil, a poor water solubility fungicide using nanoprecipitation method. The nanocomposites were characterised with dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FTIR), scanning…
T-J Teng, M N M Arip, R Kadir, E-P Ng, H-L Lee
FTIR-ATR monitoring of chemical changes of thermo-chemically modified beech wood degraded by brown-rot fungus
2018 - IRG/WP 18-40823
Wood chemical modification with lactic acid oligomers (OLA) has been reported to confer promising properties for wood outdoors applications. To better understand the lactic acid interaction with wood, chemical changes following biological degradation have been characterized with a battery of…
C Grosse, M Noël, M-F Thevenon, P Gérardin
Reactivity of alkoxysilanes with cellulose and lignin in presence of catalysts
2018 - IRG/WP 18-40831
…agents. Aluminium acetylacetonate (Al(acac)3) and acetic acid (AcOH) were used as catalysts.
Samples were measured by using FT-IR. It turned out that cellulose was not so readily reactive to alkoxysilanes as lignin. However, cellulose can react with silanols, which are the product of hydrolysis of alkoxysilanes.…
J Siuda, W Perdoch, B Mazela, M Zborowska
Polyesterification of wood using sorbitol and citric acid under aqueous conditions
2018 - IRG/WP 18-40851
…determine if the polyesterification of sorbitol and citric acid in wood has a future potential as a wood modification process. Pine wood was impregnated with an aqueous solution containing citric acid and sorbitol and was thereafter cured at 103, or 140°C for 18 hours. The dimensional stability and leaching…
E Larnøy, A Karaca, L R Gobakken, C A S Hill
Prevention of fungal damage of oil and date palm wood by organic acids
2017 - IRG/WP 17-10877
…mould and rot fungi. Environmental-friendly organic acids are suitable. Small samples of oil palm (Elaeis guineensis) and date palm (Phoenix dactylifera) wood were treated with 1 to 10% solutions of acetic acid and propionic acid, respectively, and subsequently infected by moulds, blue-stain and wood-decay…
M Bahmani, O Schmidt
Evaluating the role of Actinobacteria in the gut of wood-feeding termites (Reticulitermes spp.)
2017 - IRG/WP 17-10880
…well studied. However, there is also evidence that uric acid can be metabolized into ammonia and serve as an additional nitrogen source. In this study, 36 Actinobacterial isolates (Streptomyces spp.) from the guts of Reticulitermes flavipes (Kollar) and Reticulitermes tibialis Banks, were screened for uric acid…
Evaluating the role of Actinobacteria in the gut of wood-feeding termites (Reticulitermes spp.)
Activity of Two Strobilurin Fungicides Against Three Species of Decay Fungi in Agar Plate Tests
2017 - IRG/WP 17-30704
…and Fibroporia radiculosa). SHAM (salicylhydroxamic acid) was also included in the study because it is a known potentiator of strobilurin activity. All treatments were incorporated in an agar-based media and evaluated for their effects on mycelial growth rate. Based on minimum inhibitory concentration values…
J D Tang, T Ciaramitaro, M Tomaso-Peterson, S V Diehl
Liquefaction of woody waste: A novel approach in wood protection from CNSL based liquefied wood polyols
2017 - IRG/WP 17-30711
…various wood : CNSL ratio as 1:3, 1:4 and 1:5 using mild acid as catalyst at different reaction conditions. In all the cases, a viscous and sticky black liquid was obtained which was used for protection of wood against of fungi and termite. The highly perishable rubber wood specimens were treated by employing…
A Kumar, G B.Nagarajappa, S Singh Chauhan
The potential and the challenges of acetylated wood in timber bridges - experiences from an ongoing project
2017 - IRG/WP 17-40792
…class 3. Poor wettability and remaining free acetic acid from the modification process influence the bonding to various degrees. The project aims to improve the bonding properties of acetylated softwood and hardwood by manipulating a MUF-based adhesive system.
A Treu, R Bredesen, F Bongers
A Green and Novel Technology for Recovering Copper and Wood from Treated Wood Waste – Part II: Optimization, copper metal recovery, and process design
2017 - IRG/WP 17-50326
…Two safe and low cost extraction systems, citric acid and ammonium citrate, were identified in Part I of this study. In Part II of the study, effects of extraction conditions such as time, temperature, and equilibrium copper concentration were determined. More than 95% of copper was removed either at…
S Chen, R Patel
Five-year evaluation of a field trial of Eucalyptus grandis poles treated with zinc and boron
2017 - IRG/WP 17-30721
…inorganic borates and metal salts (zinc sulfate and boric acid+borax) was studied; the aims were to form an insoluble precipitate of zinc borate inside wood and to reduce treatment costs by performing the first treatment by simple ascent and diffusion of the preservative, at the same time as it was sought to…
C Ibáñez, A Camargo, C Mantero, M Rabinovich
Accelerated Weathering Performance of Impregnated Wood Samples Coated with Zinc by Means of Plasma-Assisted Particle Deposition
2016 - IRG/WP 16-30682
…First, wood samples were impregnated with boric acid, tall oil or copper azole. After impregnation, the samples were coated with zinc (Zn) particles, and coated and uncoated samples were exposed to accelerated weathering tests. The changes of the surface properties of the treated and untreated wood samples…
A Can, H Sivrikaya
Evidence for a role for precipitated copper on the chemistry of micronized copper treatments
2016 - IRG/WP 16-30690
…of the basic copper carbonate (BCC) with the carboxylic acid functional groups in hemicellulose and pectic substances present in wood. Typically, the amount of reacted copper formed is approximately 0.3% Cu m/m. In this paper, two examples are discussed where remaining unreacted basic copper carbonate can become…
Wei Xue, P Kennepohl, J N R Ruddick
Evaluation of advanced tannin-boron preservative in unsterile soil-bed tests
2016 - IRG/WP 16-30693
…extract, can be linked with boron (in the form of boric acid) into treated wood, without affecting boron biological activity. Moreover, adding hexamine in the formulation allows waterproofing the tannin-boron system within treated timber. Tannin-boron-hexamine association have shown their efficacy in laboratory…
Jinbo Hu, Yiqiang Wu, Shanshan Chang, Guangming Yuan, G Tondi, M-F Thévenon