Method for counting the hydrogen-bond cross-links in coal

被引：0
|
作者：
Larsen, John W. [1 ]
Gurevich, Ilona [1 ]
Glass, Amy S. [1 ]
Stevenson, Damon S. [1 ]
机构：
[1] Lehigh Univ, Bethlehem, United States
来源：
Energy and Fuels | 1996年 / 10卷 / 06期
关键词：
Association reactions - Conformations - Crosslinking - Curve fitting - Entropy - Free energy - Hydrogen bonds - Macromolecules - Mathematical models - Solvents - Swelling - Titration;
D O I：
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学科分类号：
摘要：
Increasing the amount of the hydrogen acceptor added to a nonpolar swelling solvent increases the swelling of the coal. Plotting swelling against pyridine concentration results to a titration curve which estimates the number of hydrogen bond crosslinks in the coal. The selectivity of the acceptor for crosslinking hydroxyls is due to the more favorable entropy change when one of these crosslinks is disrupted by a formation of a new H-bond to pyridine, which frees a portion of the coals leading to more favorable conformations.
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页码：1269 / 1272
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