The heterogeneous character of the dilute acid hydrolysis of crystalline cellulose
Barry F. Wood
Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin, Madison, Wisconsin 53706
Search for more papers by this authorAnthony H. Conner
USDA, Forest Service, Forest Products Laboratory, One Gifford Pinchot Dr., Madison, Wisconsin 53705-2398
Search for more papers by this authorCorresponding Author
Charles G. Hill Jr.
Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin 53706
Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin 53706===Search for more papers by this authorBarry F. Wood
Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin, Madison, Wisconsin 53706
Search for more papers by this authorAnthony H. Conner
USDA, Forest Service, Forest Products Laboratory, One Gifford Pinchot Dr., Madison, Wisconsin 53705-2398
Search for more papers by this authorCorresponding Author
Charles G. Hill Jr.
Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin 53706
Department of Chemical Engineering, University of Wisconsin, Madison, Wisconsin 53706===Search for more papers by this authorMaintained in cooperation with the University of Wisconsin.
Abstract
The end-attack model proposed by Sharples [Trans. Faraday Soc., 53, 1003 (1957)] for the dilute acid hydrolysis of crystalline cellulose was tested using the results from the size-exclusion chromatographic analysis of samples of crystalline cellulose I and cellulose II hydrolyzed in 6.1N HCl at 107°C. The differential number distribution of the molecular weight of hydrolyzed cellulose was found to be approximately exponential, a result which is consistent with the end-attack model. Differences in the rates of hydrolysis of cellulosic materials appear to arise from differences in both the degree of polymerization and the microstructure of hydrolyzed cellulose. Evidence is also presented which suggests that the recrystallization upon hydrolysis results in part from the lateral accretion of chains which are cleaved during the hydrolysis of amorphous regions in the cellulose microfibrils.
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