Tableau 2
Concentrations en groupes carbonyle et hydroxyle dans le PEI et le PEEK avant et après vieillissement thermique (aux temps t0, t1 et t2) et évolution correspondante du paramètre de solubilité d’Hildebrand.
Concentrations of carbonyl and hydroxyl groups in PEI and PEEK before and after thermal ageing (at times t0, t1 and t2) and corresponding changes of the Hildebrand’s solubility parameter.
| Matériau | Prélèvement | [Carbonyles] (mol.L−1) | [Hydroxyles] (mol.L−1) | δ (MPa1/2) |
|---|---|---|---|---|
| PEI vieilli à 250 °C | t0 | 8,5 | – | 24,7 |
| t1 | 2,0 × 10−1 | 24,8 | ||
| t2 | 7,0 × 10−1 | 25,0 | ||
| PEEK vieilli à 320 °C | t0 | 4,6 | – | 21,1 |
| t1 | 1,3 × 10−1 | 21,2 | ||
| t2 | 5,9 × 10−1 | 21,3 |
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