Lifetime assessment of epoxies by the kinetics of thermal degradation

Autor:	Herbert Dr. Stutz
Rok vydání:	2003
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Annealing (metallurgy) Kinetics Thermodynamics General Chemistry Polymer Activation energy Surfaces Coatings and Films chemistry Polymer chemistry Isothermal annealing Thermal Materials Chemistry Heat deflection temperature
Zdroj:	Journal of Applied Polymer Science. 91:1881-1886
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.13240
Popis:	The kinetics of thermal degradation of 4,4′-diaminodiphenylsulfone (DDS)-cured glycidylethers (DGBA) and glycidylamines (TGDDM) have been studied by isothermal annealing. Thermal degradation proceeds via first-order kinetics with activation energies of 138 (DGBA/DDS) and 95 kJ/mol (TGDDM/DDS). From these data the temperature-dependent lifetime can be calculated. Based on the heat distortion temperature and 20 years' service as criteria, the upper service temperature is found to be around 115–120°C. In spite of the different activation energies and bond stabilities, only marginal differences in the upper allowed service temperatures between these resins were found. Only slight improvements can be expected by optimizing the cure conditions. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1881–1886, 2004
Databáze:	OpenAIRE
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