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Curing behavior of a novolac‐type phenolic resin analyzed by differential scanning calorimetry
Author(s) -
De Medeiros Eliton S.,
Agnelli José A. M.,
Joseph Kuruvilla,
De Carvalho Laura H.,
Mattoso Luiz H. C.
Publication year - 2003
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.12838
Subject(s) - activation energy , curing (chemistry) , differential scanning calorimetry , materials science , polymer chemistry , kinetic energy , reaction rate constant , kinetics , atmospheric temperature range , order of reaction , chemistry , chemical engineering , composite material , thermodynamics , physics , quantum mechanics , engineering
Curing of a novolac‐type phenolic resin was studied by DSC. The kinetic analysis was performed by means of the dynamic Ozawa method at heating rates of 5, 10, 15, and 20°C/min. This analysis was used to determine the kinetic parameters of the curing process. The activation energy was found to be 144 kJ/mol. It was found that the Ozawa exponent values decreased with increasing reaction temperature from 3.5 to 1, suggesting a change in the reaction mechanism from microgel growth to diffusion‐controlled reaction. The reaction rate constant was found to range from 123.0 to 33.6 (°C/min) n . © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1678–1682, 2003
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