A simple model for predicting polymer ignition in a thermogravimetric analyzer |
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| Affiliation: | 1. Department of Psychology, Ningbo University, Ningbo, China;2. Philosophy and Social Science Laboratory of Reading and Development in Children and Adolescents (South China Normal University), Ministry of Education, Guangzhou, China;3. Department of Psychology, Humboldt Universität zu Berlin, Berlin, Germany;1. Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, Frankfurt am Main, 60438, Germany;2. Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, Frankfurt am Main 60438, Germany |
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| Abstract: | Ignition of three polymers (PP, PS and PVA) in air was studied using a DuPont 951 thermogravimetric analyzer (TGA). Time to ignition and ignition temperature were reported as a function of furnace temperature which varied between 550–700°C. The suitability of a simplified model to predict time to ignition was tested. The predicted value of time to ignition was heavily dependent on the assumed sample layer thickness (D). For example, when the average particle diameter, dp, was ~0.5 mm, assigning D a value of D = 2 dp (i.e. two layers of particles in sample pan) produced a good estimate of the time to ignition. However for dp ~1 mm, a good estimate was obtained when D was chosen equal to dp. The results indicated a deviation from experimental values of less than 15% at 700° C. |
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