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

Type Article
Date 2020-11
Language English
Author(s) Bardin Antoine1, 2, 3, Le Gac Pierre YvesORCID1, Bindi Hervé2, Fayolle Bruno3
Affiliation(s) 1 : Marine Structure Laboratory IFREMER, Centre de Bretagne Plouzané ,France
2 : Thales DMS France Valbonne, France
3 : PIMM laboratory, Arts et Metiers Institute of Technology CNRS, Cnam, HESAM Université Paris ,France
Source Journal Of Polymer Science (2642-4150) (Wiley), 2020-11 , Vol. 58 , N. 22 , P. 3170-3182
DOI 10.1002/pol.20200460
WOS© Times Cited 5
Keyword(s) essential work of fracture, poly(ether-block-amide), structure-property relationship, thermoplastic elastomer, thermoplastic polyurethane elastomer

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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Bardin Antoine, Le Gac Pierre Yves, Bindi Hervé, Fayolle Bruno (2020). Relationships between molar mass and fracture properties of segmented urethane and amide copolymers modified by chemical degradation. Journal Of Polymer Science, 58(22), 3170-3182. Publisher's official version : , Open Access version :