Technical Paper Archive


This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.


For older papers not listed here, please send your request, including Meeting Year, Title, Author, and Paper # to: cbrady@rubber.org


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Fundamental Aspect for Evaluation of Activation Energy of Thermal degradation of Tetrafluoroethylene-propylene elastomer by Weight Change

D22 ito fundamental aspect for evaluation of activation energy of thermal degradation

Event: 196th Technical Meeting - Fall 2019
Location: Cleveland, OH
Date: October 08, 2019
Author: Masayuki Ito
Paper Number: D22

Price: $20.00

  • Thermogravimetric analysis (TGA) has been used for obtaining activation energy which is necessary for deciding the condition of short time of thermal aging. The activation energy obtained by TGA and that obtained by thermal aging at constant temperature was compared in this article. The sample was tetrafluoroethylene-propylene elastomer (TPE) whose thickness was 0.15 mm. The rate of mass loss at constant temperature increased from oxidation induction time (OIT). Activation energy obtained by TGA was higher than that obtained at constant temperature and the value depended on the rate of temperature rise. The pre-irradiation of gamma ray of 500kGy disappeared OIT observed at constant temperature. The pre-irradiation decreased the activation energy obtained by TGA. The value was from 143 kJ/mol to 157 kJ/mol, depending on the given conversion. Table 1 shows the summarized result. Table 1 Activation energy of TPE obtained with various view points Focused point Activation energy /kJ mol-1 The conversion on constant temperature1) 110-123 OIT observed on constant temperature 106 TGA, higher rate of temperature rise 219-237 TGA, lower rate of temperature rise 153-173 TGA, weight started to decrease 186 TGA, inflection point (Second derivative is 0) 170 1) The given conversion was 90%, 80%, 70%, 60% and 60%.

    Papers from 196th Technical Meeting - Fall 2019

    Items from 196th Technical Meeting - Fall 2019