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Cyclization reaction in poly(acrylonitrile/itaconic acid) copolymer: An isothermal differential scanning calorimetry kinetic study
Author(s) -
Devasia Renjith,
Nair C. P. Reghunadhan,
Sivadasan P.,
Katherine B. K.,
Ninan K. N.
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.11706
Subject(s) - autocatalysis , differential scanning calorimetry , acrylonitrile , itaconic acid , activation energy , polymer chemistry , copolymer , isothermal process , nitrile , order of reaction , chemistry , catalysis , kinetics , materials science , thermodynamics , reaction rate constant , organic chemistry , polymer , physics , quantum mechanics
The kinetics of the cyclization reaction in the poly(acrylonitrile/itaconic acid) (PAN) copolymer in the temperature range 175–200°C was studied by isothermal differential scanning calorimetry (DSC). The reaction conforms to an n th ‐order autocatalytic model, with an overall order of 2. The kinetic parameters were derived by multiple regression analysis. The activation energy is 110.3 kJ/mol for the acid‐catalyzed reaction and 153.2 kJ/mol for the autocatalytic part. The autocatalysis indicates the catalysis of the nitrile group cyclization by the initially formed pyrimidine groups. The kinetic parameters were used to predict the reaction profile at a given temperature. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 915–920, 2003