Abstract
Ionic liquids (ILs) have been investigated for their potential as reagents for enhancing the fire resistance of wood. The following ILs were in focus: 1-ethyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium tetrafluoroborate, and 1-ethyl-3-methylimidazolium hexafluorophosphate ([C2mim][PF6]). Supposedly, these ILs do not dissolve or degrade wood components to a large extent. No morphologic changes were observed in any IL-treated wood samples, but they showed an enhanced fire resistance compared with that of untreated wood. Scanning electron microscopy and energy-dispersive X-ray analysis demonstrated that the ILs are penetrated into the cell walls. The wood treated with [C2mim][PF6] exhibited the highest fire resistance based on thermogravimetric and differential thermal analyzer studies: it was more resistant against flaming at approximately 350°C and the subsequent glowing at higher temperatures. This enhanced fire resistance was interpreted by dehydration in the presence of the ILs under observation. In general, ILs are promising reagents for improving the thermal properties of wood.
We thank Mr. Kiyotaka Ito and Mr. Yuki Ukai (J-Science Lab Co., Ltd.) for their assistance in elemental analysis.
References
Barthel, S., Heinze, T. (2006) Acylation and carbanilation of cellulose in ionic liquids. Green Chem. 8:301–307.10.1039/B513157JSearch in Google Scholar
Baysal, E., Yalinkilic, M.K. (2005) A comparative study on stability and decay resistance of some environmental friendly fire-retardant boron compounds. Wood Sci. Technol. 39: 169–186.Search in Google Scholar
Baysal, E., Altinok, M., Colak, M., Ozaki, S.K., Toker, H. (2007) Fire resistance of Douglas fir (Pseudotsuga menzieesi) treated with borates and natural extractives. Bioresource Technol. 98:1101–1105.10.1016/j.biortech.2006.04.023Search in Google Scholar
Blasi, C.D., Branca, C., Galgano, A. (2008) Thermal and catalytic decomposition of wood impregnated with sulfur- and phosphorus-containing ammonium salts. Polym. Degrad. Stabil. 93:335–346.10.1016/j.polymdegradstab.2007.12.003Search in Google Scholar
Browne, F.L. (1958) Theories of the combustion of wood and its control. In: U.S. Forest Service No. 2136, Forest Product Lab., Madison, WI, pp. 20–33.Search in Google Scholar
Chen, G.C. (2008) Synthesis and evaluation of phosphortriamidates in wood for thermal and fungal decay protection. Holzforschung 62:318–321.10.1515/HF.2008.056Search in Google Scholar
DeGroot, W.F., Shafizadeh, F. (1984) The influence of exchangeable cations on the carbonization of biomass. J. Anal. Appl. Pyrol. 6:217–232.10.1016/0165-2370(84)80019-4Search in Google Scholar
Fort, D.A., Remsing, R.C., Swatloski, R.P., Moyna, P., Moyna, P., Rogers, R.D. (2007) Can ionic liquids dissolve wood? Processing and analysis of lignocellulosic materials with 1-n-butyl-3-methylimidazolium chloride. Green Chem. 9:63–69.10.1039/B607614ASearch in Google Scholar
Furuno, T., Uehara, T., Jodai, S. (1993) Combinations of wood and silicate, 3: some properties of wood-mineral composites using the water glass-boron compound system. Mokuzai Gakkaishi 39:561–570.Search in Google Scholar
Garba, B. (1999) Effect of zinc borate as flame retardant formulation on some tropical wood. Polym. Degrad. Stabil. 64: 517–522.10.1016/S0141-3910(98)00136-0Search in Google Scholar
Heinze, T., Schwikal, K., Barthel, S. (2005) Ionic liquids as reaction medium in cellulose functionalization. Macromol. Biosci. 5:520–525.Search in Google Scholar
Honglu, X., Tiejun, S. (2006) Wood liquefaction by ionic liquids. Holzforschung 60:509–512.10.1515/HF.2006.084Search in Google Scholar
Kilpeläinen, I., Xie, H., King, A., Granstrom, M., Heikkinen, S., Argyropoulos, D.S. (2007) Dissolution of wood in ionic liquids. J. Agric. Food Chem. 55:9142–9148.10.1021/jf071692eSearch in Google Scholar PubMed
Liebner, F., Patel, I., Ebner, G., Becker, E., Horix, M., Potthast, A., Rosenau, T. (2010) Thermal aging of 1-alkyl-3-methylimidazolium ionic liquids and its effect on dissolved cellulose. Holzforschung 64:161–166.10.1515/hf.2010.033Search in Google Scholar
Miyafuji, H., Saka, S. (1996) Wood-inorganic composites prepared by the sol-gel process V: fire-resisting properties of the SiO2-P2O5-B2O3 wood-inorganic composites. Mokuzai Gakkaishi 42:74–80.Search in Google Scholar
Miyafuji, H., Saka, S. (1997) Fire-resisting properties in several TiO2 wood-inorganic composites and their topochemistry. Wood Sci. Technol. 31:449–455.Search in Google Scholar
Miyafuji, H., Saka, S. (1998) SiO2-P2O5-B2O3 wood-inorganic composites prepared by metal alkoxide oligomers and their fire-resisting properties. Holzforschung 52:410–416.10.1515/hfsg.1998.52.4.410Search in Google Scholar
Miyafuji, H., Saka, S. (2001) Na2O-SiO2 wood-inorganic composites prepared by the sol-gel process and their fire-resistant properties. J. Wood Sci. 47:483–489.10.1007/BF00767902Search in Google Scholar
Miyafuji, H., Suzuki, N. (2011) Observation by light microscope of sugi (Cryptomeria japonica) treated with the ionic liquid, 1-ethyl-3-methylimidazolium chloride. J. Wood Sci. 57: 459–461.10.1007/s10086-011-1190-1Search in Google Scholar
Miyafuji, H., Suzuki, N. (2012) Morphological changes in sugi (Cryptomeria japonica) wood after treatment with the ionic liquid, 1-ethyl-3-methylimidazolium chloride. J. Wood Sci. 58:222–230.10.1007/s10086-011-1245-3Search in Google Scholar
Miyafuji, H., Miyata, K., Saka, S., Ueda, F., Mori, M. (2009) Reaction behavior of wood in an ionic liquid, 1-ethyl-3-methylimidazolium chloride. J. Wood Sci. 55:215–219.10.1007/s10086-009-1020-xSearch in Google Scholar
Nakamura, A., Miyafuji, H., Saka, S. (2010a) Liquefaction behaviour of western red cedar and Japanese beech in the ionic liquid 1-ethyl-3-methylimidazolium chloride. Holzforschung 64:289–294.10.1515/hf.2010.042Search in Google Scholar
Nakamura, A., Miyafuji, H., Saka, S. (2010b) Influence of reaction atmosphere on the liquefaction and depolymerisation of wood in an ionic liquid, 1-ethyl-3-methylimidazolium chloride. J. Wood Sci. 56:256–261.10.1007/s10086-009-1081-xSearch in Google Scholar
Nakamura, A., Miyafuji, H., Saka, S., Mori, M., Takahashi, H. (2010c) Recovery of cellulose and xylan liquefied in ionic liquids by precipitation in anti-solvents. Holzforschung 64:77–79.10.1515/hf.2010.004Search in Google Scholar
Nishimoto, K., Tsunoda, K., Imamura, Y. (1988) New complex material, wood ceramic – their properties. In: Proceedings of S5. 03-04 Session IUFRO D5, Forest Prod. Conf., Sao Paulo, Brazil, pp. 55–63.Search in Google Scholar
Ogiso, K., Saka, S. (1993) Wood-inorganic composites prepared by sol-gel process II: effects of ultrasonic treatments on preparation of wood-inorganic composites. Mokuzai Gakkaishi 39:301–307.Search in Google Scholar
Ogiso, K., Saka, S. (1994) Wood-inorganic composites prepared by sol-gel process IV: effects of chemical bonds between wood and inorganic substances on property enhancement. Mokuzai Gakkaishi 40:1100–1106.Search in Google Scholar
Pedieu, R., Koubaa, A., Riedl, B., Wang, X.M., Deng, J. (2012) Fire-retardant properties of wood particleboards treated with boric acid. Eur. J. Wood Prod. 70:191–197.10.1007/s00107-011-0538-ySearch in Google Scholar
Saka, S., Tanno, F. (1996) Wood-inorganic composites prepared by the sol-gel process VI: effects of a property-enhancer on fire-resistance in SiO2-P2O5 and SiO2-B2O3 wood-inorganic composites. Mokuzai Gakkaishi 42:81–86.Search in Google Scholar
Saka, S., Ueno, T. (1997) Several SiO2 wood-inorganic composites and their fire-resisting properties. Wood Sci. Technol. 31:457–466.Search in Google Scholar
Saka, S., Yakake, Y. (1993) Wood-inorganic composites prepared by sol-gel process III: chemically-modified wood-inorganic composites. Mokuzai Gakkaishi 39:308–314.Search in Google Scholar
Saka, S., Sasaki, M., Tanahashi, M. (1992) Wood-inorganic composites prepared by sol-gel processing I: wood-inorganic composites with porous structure. Mokuzai Gakkaishi 38:1043–1049.Search in Google Scholar
Seddon, K.R. (1997) Ionic liquids for clean technology. J. Chem. Technol. Biotechnol. 68:351–356.Search in Google Scholar
Shafizadeh, F., Bradbury, A.G.W., DeGroot W.F., Aanerud, T.W. (1982) Role of inorganic additives in the smolding combustion of cellulose. Ind. Eng. Chem. Prod. Res. Dev. 21:97–101.Search in Google Scholar
Shimada, K., Uehara, T., Jodai, S. (1992) Combination of wood and silicate, 2: wood-mineral composites using water glass and reactants of barium chloride, boric acid, and borax, and their properties. Mokuzai Gakkaishi 38:448–457.Search in Google Scholar
Stasiewicz, M., Fojutowski, A., Kropacz, A., Pernak, J. (2008) 1-Alkoxymethyl-X-dimethylaminopyridinium-base ionic liquids in wood preservation. Holzforschung 62:309–317.10.1515/HF.2008.028Search in Google Scholar
Stevens, R., Es, D.S. van, Bezemer, R., Kranenbarg, A. (2006) The structure-activity relationship of fire retardant phosphorus compounds in wood. Polym. Degrad. Stabil. 91:832–841.10.1016/j.polymdegradstab.2005.06.014Search in Google Scholar
Swatloski, R.P., Spear, S.K., Hobrey, J.D., Rogers, R.D. (2002) Dissolution of cellulose with ionic liquids. J. Am. Chem. Soc. 124:4947–4975.Search in Google Scholar
Terzi, E., Kartal, S.N., White, R.H., Shinoda, K., Imamura, Y. (2011) Fire performance and decay resistance of solid wood and plywood treated with quaternary ammonia compounds and common fire retardants. Eur. J. Wood. Prod. 69:41–51.Search in Google Scholar
Viell, J., Marquardt, W. (2011) Disintegration and dissolution kinetics of wood chips in ionic liquids. Holzforschung 65:519–525.10.1515/hf.2011.072Search in Google Scholar
Wang, Q., Li, J., Winandy, J.E. (2004) Chemical mechanism of fire retardance of boric acid on wood. Wood Sci. Technol. 38: 375–389.Search in Google Scholar
Wu, J., Zhang, J., Zhang, H., He, J., Ren, Q., Guo, M. (2004) Homogeneous acetylation of cellulose in a new ionic liquid. Biomacromolecules 5:266–268.10.1021/bm034398dSearch in Google Scholar PubMed
Xie, H., Shi, T. (2006) Wood liquefaction by ionic liquids. Holzforschung 60:509–512.10.1515/HF.2006.084Search in Google Scholar
©2013 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Reviews
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 1: Mode I fracture
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 2: Mode II fracture
- Original Articles
- Molecular weight distributions of acetylated lignocellulosic biomasses recovered from an ionic liquid system
- Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design
- Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp
- Mechanical performance of yew (Taxus baccata L.) from a longbow perspective
- Predicting Douglas-fir wood density by artificial neural networks (ANN) based on progeny testing information
- The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood
- Fire resistance of wood treated with various ionic liquids (ILs)
- Evaluation of cell wall reinforcement in feather keratin-treated waterlogged wood as imaged by synchrotron X-ray microtomography (μXRT) and TEM
- Drying of beech (Fagus sylvatica L.) timber in oscillation climates: drying time and quality
- Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy
- Condensed conifer tannins as antifungal agents in liquid culture
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Reviews
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 1: Mode I fracture
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 2: Mode II fracture
- Original Articles
- Molecular weight distributions of acetylated lignocellulosic biomasses recovered from an ionic liquid system
- Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design
- Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp
- Mechanical performance of yew (Taxus baccata L.) from a longbow perspective
- Predicting Douglas-fir wood density by artificial neural networks (ANN) based on progeny testing information
- The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood
- Fire resistance of wood treated with various ionic liquids (ILs)
- Evaluation of cell wall reinforcement in feather keratin-treated waterlogged wood as imaged by synchrotron X-ray microtomography (μXRT) and TEM
- Drying of beech (Fagus sylvatica L.) timber in oscillation climates: drying time and quality
- Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy
- Condensed conifer tannins as antifungal agents in liquid culture
- Meetings
- Meetings