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

Type
Articles dans des revues avec comité de lecture
Author
BARDIN, Antoine
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
LE GAC, Pierre‐Yves
23120 Institut Français de Recherche pour l'Exploitation de la Mer - Brest [IFREMER Centre de Bretagne]
BINDI, Hervé
302676 Thales (France)
FAYOLLE, Bruno
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/19575
DOI
10.1002/pol.20200460
Date
2020
Journal
Journal of Polymer Science

Abstract

This publication highlights the structure–property relationships in several thermoplastic elastomers (TPEs): one poly(ether-block-amide) and two thermoplastic polyurethane elastomers with ester and ether soft blocks. Structural changes are induced by chemical degradation from virgin samples through hydrolysis and oxidation. Molar mass measurements show an exclusive chain scission mechanism for all TPEs, regardless of the chemical modification condition. Mechanical behavior was nevertheless obtained from uniaxial tensile testing and fracture testing while considering the essential work of fracture (EWF) concept. During the macromolecular scission process, elongation at break shows a plateau followed by a drop, while stress at break decreases steadily. Once again, the trend is identical for all TPEs in all conditions considered. The βwp parameter determined using the EWF concept exhibits an interesting sensitivity to scissions (i.e., molar mas decrease). Plotting elongation at break as a function of molar mass reveals a strong correlation between these two parameters. This master curve is particularly remarkable considering the range of TPEs and chemical breakdown pathways considered (hydrolysis and oxidation at several temperatures). Relevant structure–property relationships are proposed, highlighting that molar mass is a predominant parameter for determining the mechanical properties of thermoplastic elastomers.

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