Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Investigation on the Physical Properties of Acetylated Domestic Softwoods

아세틸화처리 국산 침엽수재의 물리적 성질 조사

  • Lee, Won-Hee (Department of Wood Science and Technology, Kyungpook National University) ;
  • Hong, Seung-Hyun (Department of Bio-based Materials, Chungnam National University) ;
  • Kang, Ho-Yang (Department of Bio-based Materials, Chungnam National University)
  • Received : 2015.05.03
  • Accepted : 2015.07.02
  • Published : 2015.07.25
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Abstract

It has been known that acetylation improves the dimensional stability of wood. Liquid phase acetylation is more popular than gas-phase acetylation for the effectiveness of weight gain of wood. In this study domestic red and Korean pine specimens were liquid phase acetylated and their physical properties, such as density, bending strength, dimensional stability etc., were investigated. Acetylation increased the average weights of red and Korean pine specimens by 10.4% and 9.2%, respectively, and their average oven-dry densities were increased by 6.9% and 4.6%, respectively. Acetylation did not influence on modulus of rupture (MOR), modulus of elasticity (MOE) and dynamic MOE (DMOE). The average percentage reduction in hygroscopicity (PRH) of red and Korean pine specimens were respectively 20.6% and 13.8%, while the average percentage reduction in water soaking (PRW) were respectively 20.0% and 8.5%. Thus it can be concluded that the liquid acetylation improved the dimensional stability of red pine specimens more than that of Korean pine specimens.

아세틸화처리는 목재의 치수안정성을 높이는 방법으로 알려졌다. 기상처리보다는 액상처리가 중량증가율이 높기 때문에 더 많이 사용된다. 국내산 소나무재와 잣나무재를 액상 아세틸화처리하여 밀도, 휨강도, 치수안정성 등 물리적 성질에 미치는 효과를 조사하였다. 아세틸화처리에 의한 소나무와 잣나무 시편의 중량은 각각 평균 10.4%와 9.2% 증가하였으며, 전건밀도는 각각 평균 6.9%와 4.6% 증가하였다. 소나무와 잣나무 모두 휨파괴계수(MOR)와 휨탄성계수(MOE), 동탄성계수(DMOE)의 변화는 없었다. 아세틸화처리 후 목재시료의 평균 항흡습률(PRH)은 소나무와 잣나무가 각각 20.6%와 13.8% 이었다. 평균 항흡수율(PRA)은 소나무와 잣나무가 각각 20.0%와 8.5%였다. 따라서 아세틸화처리에 의해 소나무의 치수안정성이 향상된 결과를 얻었다.

Keywords

References

  1. Andris, M., Buksans, E. 2009. Fire performance characteristics of acetylated ash (Fraxinus excelsior L.) wood. Wood Material Science & Engineering 4(1-2): 76-79. https://doi.org/10.1080/17480270903315580
  2. Bryne, L.E., Waelinder, M.E.P. 2010. Ageing of modified wood. Part 1: Wetting properties of acetylated, furfurylated, and thermally modified wood. Holzforschung 64(3): 295-304. https://doi.org/10.1515/HF.2010.040
  3. Dunningham, E.A. 2012. Kinetic studies of the acetylation reaction of small Pinus radiata blocks. Eur. Journal of Wood Products 70(6): 857-863. https://doi.org/10.1007/s00107-012-0632-9
  4. Dunningham, E.A., Plackett, D.V., Singh, A.P. 1992. Weathering of chemically modified wood. Natural weathering of acetylated raidata pine: preliminary results. Holz als Roh und Werkstoff 50(11): 429-432. https://doi.org/10.1007/BF02662780
  5. Evans, P.D., Wallis, A.F.A., Owen, N.L. 2000. Weathering of chemically modified wood surfaces. Natural weathering of Scots pine acetylated to different weight gains. Wood Science and Technology 34(2): 151-165. https://doi.org/10.1007/s002260000039
  6. Feist, W.C., Rowell, R.M., Ellis, W.D. 1991. Moisture sorption and accelerated weathering of acetylated and methacrylated aspen. Wood and Fiber Science 23(1): 128-136.
  7. Futemma, Y., Obataya, E. 2012. Non-uniform reaction of solid wood in vapor-phase acetylation. Journal of Wood Science 58(4): 336-341. https://doi.org/10.1007/s10086-012-1255-9
  8. Han, G-S., Cho, N-S. 1996. Dimensional change of acetylated softwood. Journal of the Korean Wood Science and Technology 24(4): 4040-4046.
  9. Hill, C.A.S. 2009. Why does acetylation protect wood from microbiological attack? Wood Material Science & Engineering 4(1-2): 37-45. https://doi.org/10.1080/17480270903249409
  10. Hill, C.A.S., Cetin, N.S., Ozmen, N. 2000. Potential Catalysts for the Acetylation of Wood. Holzforschung 54(3): 269-272. https://doi.org/10.1515/HF.2000.045
  11. Hill, C.A.S., Papadopoulos, A.N. 2002. The Pyridine-Catalysed Acylation of Pine Sapwood and Phenolic Model Compounds with Carboxylic Acid Anhydrides. Determination of Activation Energies and Entropy of Activation. Holzforschung 56(2): 150-156. https://doi.org/10.1515/HF.2002.025
  12. Kang, H-Y., Lee, K-Y. 1997. Effect of acetylation on ultrasonic velocity of bamboo. Journal of the Korean Wood Science and Technology 25(3): 8-15.
  13. Matsunaga, M., Kataoka, Y., Matsunaga, H., Matsui, H. 2010. A novel method of acetylation of wood using supercritical carbon dioxide. Journal of Wood Science 56(4): 293-298. https://doi.org/10.1007/s10086-009-1098-1
  14. Morozovs, A., Buksans, E. 2009. Fire performance characteristics of acetylated ash (Fraxinus excelsior L.) wood. Wood Material Science & Engineering 4(1-2): 76-79. https://doi.org/10.1080/17480270903315580
  15. Pandey, K.K., Srinivas, K. 2015. Performance of polyurethane coatings on acetylated and benzoylated rubberwood. Eur. Journal of Wood Products 73(1): 111-120. https://doi.org/10.1007/s00107-014-0860-2
  16. Papadopoulos, A.N. 2006a. Pyridine-catalyst acetylation of pinewood: influence of mature sapwood vs juvenile wood. Holz als Roh-und Werkstoff 64(2): 134-136. https://doi.org/10.1007/s00107-005-0056-x
  17. Papadopoulos, A.N. 2012. Natural durability of acetylated OSB in ground stake test: total decay after 102 months of testing. Eur. J. Wood Prod. 70(1-3): 397. https://doi.org/10.1007/s00107-011-0547-x
  18. Papadopoulos, A.N., Tountziarakis, P. 2011. The effect of acetylation on the Janka hardness of pine wood. Eur. Journal of Wood Products 69(3): 499-500. https://doi.org/10.1007/s00107-010-0484-0
  19. Papadopoulos, A.N.. 2006b. Decay resistance in ground stake test of acetylated OSB. Holz als Roh-und Werkstoff 64(3): 245-246. https://doi.org/10.1007/s00107-006-0110-3
  20. Rowell, R.M., Ibach, R.E., McSweeny, J., Nilsson, T. 2009. Understanding decay resistance, dimensional stability and strength changes in heat-treated and acetylated wood. Wood Material Science & Engineering 4(1-2): 14-22. https://doi.org/10.1080/17480270903261339
  21. Rowell, R.M., Simonson, R., Hess, S., Plackett, D.V., Cronshaw, D., Dunningham, E. 1994. Acetyl distribution in acetylated whole wood and reactivity of isolated wood cell-wall components to acetic anhydride. Wood and Fiber Science 26(1): 11-18.
  22. Stamm, A.J. 1964. Wood and Cellulose Science. The Ronald Press Company, New York.