Features of the solid-phase oxidation of oriented polyethylene

Rapoport, Natalya; Goniashvili, A.Sh.; Akutin, M.S.; Shibryayeva, L.S.; Ponomareva, Ye.L.; Miller, V.B.

doi:10.1016/0032-3950(81)90186-6

Cited by 6 publications

(1 citation statement)

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“…Similarly, the variability of the oxygen solubility enables to simulate a larger cluster of maximal oxidation rates among the compilation of literature data than the effect of the crystallinity ratio alone (see Figure ). Moreover, the highest value of solubility, more consistent with the compilation of iPP data than the previous one, does not allow to simulate the upper range of this compilation, particularly above 110°C.…”

Section: Discussion: Towards a “Universal” Kinetic Modelmentioning

confidence: 99%

Impact of oxygen transport properties on polypropylene thermal oxidation, part 1: Effect of oxygen solubility

François-Heude

Richaud

Guinault

et al. 2014

J of Applied Polymer Sci

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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 single set of parameters.This model was calibrated with several series of experimental data including analyses of primary (hydroperoxides) and secondary oxidation products (carbonyl species), and subsequent changes in macromolecular properties (average molecular masses). It predicts the experimental data previously published in the literature in terms of induction times and maximal oxidation rates. The variability of the oxygen solubility coefficient allows to explain the scattering of induction times and oxidation rates among the whole iPP family, but also the dependence of this latter quantity with oxygen partial pressure. This variability is presumably due to iPP polymorphism in the temperature range where oxygen permeability is commonly measured. It is concluded that the kinetic model can be used to study the direct effect of iPP morphology on its thermal oxidation kinetics (chemistry of oxidation).

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Section: Discussion: Towards a “Universal” Kinetic Modelmentioning

confidence: 99%