Hydrolytic kinetic model predicting embrittlement in thermoplastic elastomers

Type Article
Date 2020-01
Language English
Author(s) Bardin Antoine1, 3, 4, Le Gac Pierre YvesORCID1, Cérantola Stéphane2, Simon Gaelle2, Bindi Hervé3, Fayolle B.4
Affiliation(s) 1 : Marine Structure Laboratory, IFREMER, Centre de Bretagne, 29280, Plouzané, France
2 : Plateforme RMN-RPE, UFR Sciences et Techniques, University of Western Brittany, 6 Av. V. Le Gorgeu CS93837, 29238, Brest Cedex 3, France
3 : Thales DMS France, 525 route des Dolines, 06560, Valbonne, France
4 : PIMM Laboratory, Arts et Métiers ParisTech, CNRS, Cnam, HESAM Université, 151 boulevard de l'Hôpital, 75013, Paris, France
Source Polymer Degradation And Stability (0141-3910) (Elsevier BV), 2020-01 , Vol. 171 , P. 109002 (11p.)
DOI 10.1016/j.polymdegradstab.2019.109002
WOS© Times Cited 6
Keyword(s) Thermoplastic elastomer, Hydrolysis, Kinetic model, Structure-property relationships
Abstract

A hydrolytic kinetic model predicting chains scissions of a polyurethane elastomer (TPU) containing an anti-hydrolysis agent (stabilization via carbodiimide) was developed. This model is based on four components: uncatalysed hydrolysis, acid-catalysed hydrolysis, carboxylic acid dissociation and competitive carbodiimide-based deactivation of acid. Protons were considered as the key catalyst responsible for the hydrolysis. Model parameters were determined by fitting experimental data measured on unstabilized and stabilized TPUs, aged in immersion from 40 to 90 °C. Scission kinetics were predicted for immersion and 50% relative humidity conditions, from 10 to 100 °C. Structure-failure property relationships were also investigated, between molar mass and elongation at break. A master curve was established for elongation at break with molar mass, including both TPUs at four ageing temperatures. By combining predictions for scission kinetics with the molar mass-elongation at break master curve and an embrittlement molar mass as the end-of-life criterion, non-Arrhenian lifetime predictions are proposed for all exposure conditions considered.

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