Investigation of polyamide 11 embrittlement during oxidative degradation
TypeArticles dans des revues avec comité de lecture
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 the temperature range between room temperature and 110 °C in order to investigate the influence of mechanical testing temperature on the embrittlement coordinates. In the same time, molar mass and crystalline morphology are monitored by size exclusion chromatography (SEC) and DSC/SAXS measurements respectively. The experimental results point out the existence of a critical molar mass for ductile-brittle transition M′c about 10 kg mol−1, independent of sample initial molar mass or stabilization, but depending on tensile testing temperature. However, even if oxidation chain scissions are shown to be clearly responsible for the loss of mechanical properties at failure, the structure-property relationships governing ductile-brittle transition require a mixed criterion involving molar mass and crystalline morphology, especially the interlamellar distance. For this purpose, specific molar mass – crystalline morphology relationships are investigated
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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 ...
Molecular and macromolecular structure changes in polyamide 11 during thermal oxidation - Kinetic modeling OKAMBA-DIOGO, Octavie; RICHAUD, Emmanuel; VERDU, Jacques; FERNAGUT, François; GUILMENT, Jean; FAYOLLE, Bruno (Elsevier, 2015)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 ...
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; 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 ...