Summary
Southern pine, aspen, and Douglas-fir flakes were reacted with either butylene oxide/triethylamine or acetic anhydride for various reaction times to give levels of bonded chemicals up to 25 weight percent gain. Flakes modified to 20 weight percent gain with bytylene oxide gave a flakeboard which absorbed 25% less water and had reduced thickness swelling up to 50% as compared to an untreated flakeboard. With acetic anhydride, modification, water absorption was 50% less and thickness swelling was reduced 85%. There was a 60% reduction in thickness swelling in flakeboard made from butylene oxide-modified flakes and 85% reduction from acetic anhydride-modified flakes when the boards were subjected to 90% relative humidity over a period of 20 days. The mechanism of effectiveness to reduce moisture uptake and thickness swelling is based on chemical bulking of, and a reduction in the hydrophilic nature of the cell wall polymers.
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References
American Society for Testing and Materials 1978: Evaluating the properties of wood-base fiber and particle panel materials. In: Annual ASTM Standards, Part 22. Philadelphia, PA: ASTM
Arora, M.; Rajawat, M. S.; Gupta, R. C. 1981: Effect of acetylation on properties of particleboards prepared from acetylated and normal particles of wood. Holzforsch. Holzverwert. 33: 8–10
Bekere, M.; Shvalbe, K.; Ozolinya, I. 1978: Some factors affecting the quality of boards made from acetylated wood fibers. Latvijas Lauksaimniecibas Akademija. Raksti. 163: 31–35
Brown, F. L.; Kenaga, D. L.; Gooch, R. M. 1966: Impregnation to control dimensional stability of particleboard and fiberboard. Forest Prod. J. 16: 45–53
Goldstein, J. S.; Jeroski, E. B.; Lund, A. E.; Nielson, J. F.; Weaver, J. M. 1961: Acetylation of wood in lumber thickness. Forest Prod. J. 11: 363–370
Klinga, L. O.; Tarkow, H. 1966: Dimensional stabilization of hardboard by acetylation. Tappi 49: 23–27
Rowell, R. M. 1975a: Chemical modification of wood: Advantages and disadvantages. Proc. Am. Wood Preserv. Assoc. 71: 41–51
Rowell, R. M. 1975b: Chemical modification of wood: reactions of alkylene oxides with southern yellow pine. Wood Sci. 7: 240–246
Rowell, R. M. 1982: Distribution of acetyl groups in southern pine reacted with acetic anhydride. Wood Sci. 15: 172–182
Rowell, R. M. 1984: Chemical modification of wood. Forest Products Abstracts 6: 363–382
Rowell, R. M. Reaction of epoxides with wood. Res. Pap. FPL. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory; [in press]
Rowell, R. M.; Ellis, W. D. 1978: Determination of dimensional stabilization of wood using the water-soak method. Wood Fiber 10: 104–111
Rowell, R. M.; Gutzmer, D. I.; Sachs, I. B.; Kinney, R. E. 1976: Effects of alkylene oxide treatments on dimensional stability of wood. Wood Sci. 9: 51–54
Stamm, A. J.; Cohen, W. E. 1956: Swelling and dimensional control of paper. II. Effect of cyanoethylations, acetylation, and crosslinking with formaldehyde. APPITA Proceedings. 10: 366–393
Tarkow, H.; Stamm, A. J.; Erickson, E. C. O. 1950: Acetylated wood. FPL Rep. No. 1593. Madison, WI: U.S. Dept. of Agric, For. Serv, Forest Prod. Lab.
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Rowell, R.M., Tillman, AM. & Zhengtian, L. Dimensional stabilization of flakeboard by chemical modification. Wood Sci.Technol. 20, 83–95 (1986). https://doi.org/10.1007/BF00350696
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DOI: https://doi.org/10.1007/BF00350696