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Measurement of diffusion of antioxidants in isotactic polypropylene by isothermal differential thermal analysis
Author(s) -
Schwarz T.,
Steiner G.,
Koppelmann J.
Publication year - 1989
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1989.070371206
Subject(s) - tacticity , isothermal process , polypropylene , diffusion , activation energy , materials science , differential thermal analysis , polymer chemistry , thermal oxidation , thermal analysis , differential scanning calorimetry , thermodynamics , analytical chemistry (journal) , thermal , composite material , organic chemistry , chemistry , polymer , polymerization , diffraction , physics , layer (electronics) , optics
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.