Relationships between molar mass and fracture properties of segmented urethane and amide copolymers modified by chemical degradation
Article dans une revue avec comité de lecture
Date
2020Journal
Journal of Polymer ScienceAbstract
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.
Files in this item
- Name:
- PIMM _JPS_2020_BARDIN.pdf
- Size:
- 2.056Mb
- Format:
- Description:
- Article
- Embargoed until:
- 2021-05-01
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureBARDIN, Antoine; LE GAC, Pierre-Yves; ALBOUY, Pierre-Antoine; BINDI, Hervé; FAYOLLE, Bruno (2022-03-25)By tuning hydrolysis duration of a segmented ether-amide copolymer (PEBA), a range of specimens presenting various macromolecular structures has been produced. Knowing that scissions occur predominantly at the bond between ...
-
Article dans une revue avec comité de lectureBARDIN, Antoine; LE GAC, Pierre Yves; CÉRANTOLA, Stéphane; SIMON, Gaëlle; BINDI, Hervé; FAYOLLE, Bruno (Elsevier, 2020)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 ...
-
Article dans une revue avec comité de lectureFatigue life of unfilled polychloroprene rubber is characterized in fully relaxing (R = 0) and non-relaxing conditions (R = 0.2) for more than 15 network structures. Network changes are induced by thermal oxidation ageing ...
-
Article dans une revue avec comité de lectureTo investigate the impact of chain scission on the tensile properties of elastomers, a polyester-based polyurethane was aged in seawater at several temperatures ranging from 40 °C to 90 °C. Before the hydrolysis process, ...
-
Article dans une revue avec comité de lectureWater sorption has been studied gravimetrically for polychloroprene rubber samples, first at a fixed hygrometric ratio (98% HR) and several temperatures (25, 40, 60 and 80 °C) for samples of 1.8 and 3.8 mm thickness (Constant ...