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Study on the kinetics of lignin methylolation
Author(s) -
Peng W.,
Riedl B.,
Barry A. O.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070481009
Subject(s) - lignin , differential scanning calorimetry , phenol , kinetics , activation energy , chemistry , calorimetry , ammonium , organic chemistry , polymer chemistry , chemical engineering , nuclear chemistry , thermodynamics , physics , quantum mechanics , engineering
The kinetics of lignin (ammonium‐based lignosulfonate and sodium‐based lignosulfonate) methylolation were studied in solution by monitoring the rate of disappearance of form‐aldehyde and by using differential scanning calorimetry (DSC) techniques under an iso‐thermal program, at 20, 40, 50, and 60°C, respectively. The kinetic parameters obtained from these two methods agree with each other. The results show that the degree of lignin methylolation depends on the number and availability of reactive sites per C 9 unit of lignin. Lignin methylolation has a lower activation energy and a lower preexponential factor than that of phenol methylolation. Lignins took a shorter time to reach complete methylolation than did phenol at the low temperatures used here. © 1993 John Wiley & Sons, Inc.