Measurement of diffusion of antioxidants in isotactic polypropylene by isothermal differential thermal analysis
- 20 June 1989
- journal article
- research article
- Published by Wiley in Journal of Applied Polymer Science
- Vol. 37 (12) , 3335-3341
- https://doi.org/10.1002/app.1989.070371206
Abstract
The diffusion of the phenolic antioxidant 1,3,5‐tris(3,5‐di tert‐butyl‐4‐hydroxybenzyl)mesitylene (IRGANOX 1330) in extruded sheets of isotactic polypropylene (iPP) was investigated over the temperature range from 80 to 120°C by isothermal differential thermal analysis (DTA). The measurements showed a clear relation between oxidation induction time and oxidation maximum time (both determined by isothermal DTA) and the concentration of the stablizer. It was possible to calculate the diffusion coefficients and the activation energy of diffusion of IRGANOX 1330 in iPP by measuring the oxidation maximum times across stacks of isotactic polypropylene sheets.Keywords
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