Polyethylene loss of ductility during oxidation: Effect of initial molar mass distribution

Abstract

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Relationships between molar mass and fracture properties of segmented urethane and amide copolymers modified by chemical degradation

“…The Dispersity Đ remains around 2 (not shown). These are evidences of a random scission mechanism, as reported in the literature in numerous cases: PP under oxidation, 17 polyethylene under oxidation, 28 polyamides under oxidation 29 and hydrolysis 30 or PLA under oxidation 31 . Random scission is thus the exclusive mechanism taking place.…”

Ageing Assessment of XLPE LV Cables for Nuclear Applications Through Physico-Chemical and Electrical Measurements

“…When the polymer matrix is no longer sufficiently protected, oxidation accelerates suddenly leading to the formation of a large variety of carbonyl and hydroxyl products [8], but also to consequential changes in the macromolecular and morphological structures that are responsible for a catastrophic decay in fracture properties [9]. As an example, the following causal chain was established for linear PE [10]:…”

PBT plasticity loss induced by oxidative and hydrolysis ageing

“…In the case of polypropylene for example, pioneering works by Fayolle [15,16] showed the embrittlement occurs when molar mass gets below a critical mass M' c below which there is no more plastic deformation. Later, this end of life criterion was completed in the case of polyethylene [17,18] , polyamide [19,20] and PLA [21] : it was highlighted that the embrittlement is also dependant on residual amorphous phase content, then crystallinity. Schematically, polymer gets brittle at low molar mass and/or low amorphous phase content and the ductile-brittle transition is represented by a line in L a (or L c , or χ c ) vs M w or M n diagram.…”