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Thermal stability and pyrolysis kinetics of lignin‐phenol‐formaldehyde resins
Author(s) -
Pérez J. M.,
Fernández A.
Publication year - 2011
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.34817
Subject(s) - thermogravimetric analysis , formaldehyde , activation energy , thermal stability , lignin , pyrolysis , curing (chemistry) , isothermal process , kinetics , materials science , phenol , chemical engineering , kinetic energy , polymer chemistry , polymer , organic chemistry , chemistry , composite material , thermodynamics , physics , quantum mechanics , engineering
Abstract A thermal stability and kinetic study from non‐isothermal experiments of a commercial and a lignin‐novolac resin mixed with two amounts of curing agent has been done employing thermogravimetric analysis technique. Three kinetic models have been tested: a single heating rate method, such as Coats‐Redfern, employing several mechanistic functions and contrasted with Van Krevelen—it is the first time that this method has been employed in polymer degradation. Finally, the Ozawa method allowed the obtaining of the activation energy by the multiple‐heating‐rate without knowing the mechanism. Results show that commercial mixtures of resins lose less weight than lignin‐novolac resins. The calculated kinetic parameters showed that Coats‐Redfern gives similar results to Van Krevelen, which means that these methods are adequate for novolac pyrolysis, and Ozawa shows activation energies in accordance with the last mentioned models. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012