Acetyl Distribution in Acetylated Whole Wood and Reactivity of Isolated Wood Cell-Wall Components to Acetic Anhydride
Keywords:
Esterification, acetic anhydride, reactivity, lignin, holocellulose, hemicellulose, cellulose, chemical distribution, reaction rateAbstract
Lignin, holocellulose, cellulose, and hemicelluloses were isolated from pine wood and reacted with acetic anhydride. The order of reactivity was found to be lignin < hemicelluloses << holocellulose. Cellulose did not react. At a level of bonded acetyl where all the hydroxyl groups were substituted on the lignin polymer, only about 20% of the total theoretical hydroxyl groups on the holocellulose were substituted. The data suggest that in the reaction of chloroacetic anhydride with whole wood, the initial rate-controlling step is the rate of diffusion of reactive chemical into the cell wall.References
Callow, H. J. 1951. Acetylation of cellulose and lignin in jute fiber. J. Indian Chem. Soc 28:605-610.nCallow, H. J. 1952. Delignification of jute with sodium chlorite. J. Textile Inst. 43:T247-249.nKirk, T. K. 1975. Effects of a brown-rot fungus, Lenzites trabea, on lignin in spruce wood. Holzforschung 29(3): 99-107.nLoras, V. 1968. Bleaching and stabilization of flash-dried mechanical pulp. Pulp Paper Mag. Can. 69(2):57-63.nMoore, W. E., and D. B. Johnson. 1967. Procedures for the chemical analysis of wood and wood products. USDA Forest Service Forest Products Laboratory.nPeterson, M. D., and R. J. Thomas. 1978. Protection of wood from decay fungi by acetylation—An ultrastruc-tural and chemical study. Wood Fiber 10(3):149-163.nRowell, R. M. 1980. Distribution of reacted chemicals in southern pine modified with methyl isocyanate. Wood Science 13(2): 102-110.nRowell, R. M. 1982. Distribution of acetyl groups in southern pine reacted with acetic anhydride. Wood Science 15(2): 172-182.nRowell, R. M. 1983. Chemical modification of wood. Commonwealth Forestry Bureau, Forest Products Abstracts Review Article 6(12):363-382.nRowell, R. M. 1992. Protection of wood against biodegradation by chemical modification. In Proceedings Cellulose December 91. New Orleans, LA.nRowell, R. M., and D. I. Gutzmer. 1975. Chemical modification of wood: Reactions of alkylene oxides with southern yellow pine. Wood Sci. 7(3):240-246.nRowell, R. M., A. M. Tillman, and R. Simonson. 1986. A simplified procedure for the acetylation of hardwood and softwood flakes for flakeboard production. J. Wood Chem. Technol. 6(3):427-448.nStamm, A. J. 1964. Wood and cellulose science. Ronald Press Co., New York, NY.nSumi Y., R. D. Yale, J. A. Mayer, B. Leopold, and B. G. Ranby. 1964. Accessibility of wood and wood carbohydrates measured with tritiated water. Tappi 47(10): 621-624.n
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