Molecular and macromolecular structure changes in polyamide 11 during thermal oxidation - Kinetic modeling
TypeArticles dans des revues avec comité de lecture
The oxidation kinetics of unstabilized polyamide 11 thin ﬁlm under oxygen pressures up to 2.0 MPa was studied by means of ferrous ion method for hydroperoxides titration, size exclusion chromatography (SEC) for molar weight measurements and in situ FTIR monitoring for carbonyl build up. Oxidation was shown not to be limited by oxygen diffusion which militates in favor of the use of a simple kinetic model for simulating experimental data. The kinetic parameters of this model were estimated from literature for initiation and propagation, and from selective experiments such as aging under several oxygen pressures for the estimation of the termination rate constants, or exposures under inert atmosphere to investigate the solid state polymerization effects and tentatively check the boundary conditions of the model. The kinetic model simulates satisfyingly the overall experimental results using the minimal number of adjustable parameters (except for some reactions difﬁcult to be experimentally isolated and studied).
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OKAMBA-DIOGO, Octavie; RICHAUD, Emmanuel; VERDU, Jacques; FERNAGUT, François; GUILMENT, Jean; FAYOLLE, Bruno (Elsevier, 2014)The present article reports a study of thermal oxidation of unstabilized polyamide 11 films at several temperatures (90–165 °C) under atmospheric pressure and under various oxygen pressures (up to 1.6 MPa) at 110 °C. The ...
RICHAUD, Emmanuel; OKAMBA-DIOGO, Octavie; FAYOLLE, Bruno; VERDU, Jacques; GUILMENT, Jean; FERNAGUT, François (Elsevier, 2013)The literature on oxidation kinetics of polyamides and model compounds has been reviewed in order to try to extract suitable information for non-empirical kinetic modeling. Polyamide characteristics are systematically ...
OKAMBA-DIOGO, Octavie; RICHAUD, Emmanuel; VERDU, Jacques; FERNAGUT, François; GUILMENT, Jean; PERY, Frédérique; FAYOLLE, Bruno (Elsevier, 2016)Polyamide 11 ﬁlms stabilized by Irganox® 1098, Irganox® 1010 or Irganox® 245 were subjected to thermal oxidation at 110°C. The residual phenol content was assessed by comparing three analytical methods:high performance ...
OKAMBA-DIOGO, Octavie; RICHAUD, Emmanuel; VERDU, Jacques; FERNAGUT, François; GUILMENT, Jean; FAYOLLE, Bruno (Elsevier, 2016)Embrittlement processes occurring during thermal oxidation are investigated for stabilized and unstabilized polyamide 11 samples differing by their thicknesses and initial molar masses. Tensile tests were carried out in ...
OKAMBA-DIOGO, Octavie; FERNAGUT, François; GUILMENT, Jean; PERY, Frederique; FAYOLLE, Bruno; RICHAUD, Emmanuel (ELSEVIER, 2020)This paper addresses the effect of hindered phenols (mainly Irganox 1098 with a few comparisons with other phenolic antioxidants) on the stabilization of polyamide 11 aged at several temperatures (90–165 °C). The effect ...