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- Title
Kinetics of Thermal Polymerization Can Be Studied during Continuous Cooling.
- Authors
Liavitskaya, Tatsiana; Vyazovkin, Sergey
- Abstract
Abstract: It is demonstrated that differential scanning calorimetry can measure the kinetics of the thermally initiated polymerization during continuous cooling. The measurements are accomplished by switching from fast heating to much slower cooling. The study is exemplified by crosslinking polymerization (curing) of diglycidyl ether of bisphenol A epoxy and <italic>m</italic>‐phenylenediamine taken in stoichiometric and nonstoichiometric ratios and measured under heating and cooling conditions. An advanced isoconversional method reveals that the reaction in the nonstoichiometric system follows the kinetics of the single‐step type. Its activation energy is constant and the same for heating and cooling conditions. The stoichiometric system exhibits the multistep kinetics characterized by the dependencies of the activation energy on temperature that differ qualitatively for cooling and heating runs. The discovered differences emphasize the need for further systematic studies of the thermal polymerization during continuous cooling.
- Subjects
POLYMERIZATION kinetics; DIFFERENTIAL scanning calorimetry; ACTIVATION energy; NONSTOICHIOMETRIC compounds; CHEMICAL reactions
- Publication
Macromolecular Rapid Communications, 2018, Vol 39, Issue 4, p1
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201700624