Influence of temperature, UV-light wavelength and intensity on polypropylene photothermal oxidation
TypeArticles dans des revues avec comité de lecture
A criterion based on the energy absorbed by photosensitive species was proposed to describe the contribution of UV-light to the initiation of the polypropylene photothermal oxidation whatever the light source. The calculation of this energy was performed using the widely accepted quantum theory. The criterion was then introduced in two different types of analytical models commonly used to describe the combined effects of UV light and temperature on induction time, namely: the reciprocity law and kinetic model. The limitations of both types of analytical models were then investigated: the latter, derived from a realistic mechanistic scheme, was found to be much more relevant than the former, which is presumably valid in a restricted range of light intensities, essentially due to its empirical origin.
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FRANÇOIS-HEUDE, Alexandre; RICHAUD, Emmanuel; DESNOUX, Eric; COLIN, Xavier (Elsevier, 2015)A general kinetic model for the photothermal oxidation of polypropylene has been derived from the basic auto-oxidation mechanistic scheme in which the main sources of radicals are the thermolysis and photolysis of the most ...
Impact of Oxygen Transport Properties on Polypropylene Thermal Oxidation, Part 1: Effect of Oxygen Solubility FRANÇOIS-HEUDE, Alexandre; RICHAUD, Emmanuel; GUINAULT, Alain; DESNOUX, Eric; COLIN, Xavier (Wiley, 2014)A general kinetic model is proposed to describe the polypropylene thermal oxidation of thin polypropylene films in a wide range of temperatures (from 60 to 200°C) and oxygen partial pressures (from 0.02 to 5 MPa) using a ...
Real-time quantitative analysis of volatile products generated during solid-state polypropylene thermal oxidation FRANCOIS-HEUDE, Alexandre; RICHAUD, Emmanuel; LEPROVOST, Julien; HENINGER, Michel; MESTDAGH, Helene; DESNOUX, Eric; COLIN, Xavier (ELSEVIER, 2013)Analysis of volatile organic compounds (VOCs) during PP thermal oxidation under three oxygen partial pressures (0%, 21% and 100% of atmospheric pressure) at 140 C was performed by proton transfer reaction coupled with ...
Impact of Oxygen Transport Properties on the Kinetic Modeling of Polypropylene Thermal Oxidation. II. Effect of Oxygen Diffusivity FRANÇOIS-HEUDE, Alexandre; RICHAUD, Emmanuel; GUINAULT, Alain; DESNOUX, Eric (Wiley, 2015)The kinetic model, established in a previous article (François-Heude et al., J. Appl. Polym. Sci., in press) to predict the homogeneous oxidation in iPP films typically thinner than 100 µm, is now extended to simulate the ...
RICHAUD, Emmanuel; AUDOUIN, Ludmila; COLIN, Xavier; FAYOLLE, BRUNO; VERDU, Jacques (In Tech, 2012)Polymers having an aromatic backbone polymers have a high mechanical strength and a high modulus. Their aromaticity increases their resistance for use in relatively severe conditions especially in aerospace and nuclear ...