Thermomechanical characterization. The polymer transition temperatures were measured by Differential Scanning Calorimetry (DSC, Pyris 1, PekinElmer) on a neat PPS film. The heat flow measurement was carried out on three samples from 50°C to 350°C with a heating and cooling rate of 10°C/minute. The evolution of the viscoelastic properties and the glass transition temperature of the composite before and after aging was evaluated by DMTA (Q800, TA instruments) in three-point bending mode following the ASTM D7028 standard [119]. The samples were cut off from a laminate composed of 16 UD plies stacked in a quasi-isotropic lay-up [0/90/±45]2S and had a dimension of 12.2 ± 0.1 mm x 3.3 ± 0.1 mm x 55.0 ± 0.5 mm. They were immersed in distilled water at 21°C and 82°C for the same duration as the joints prior to the DMTA testing. For each condition, three samples were heated at a constant rate of 3°C/minute from RT to 200°C under a mechanical oscillation with a nominal frequency of 1 Hz. The Tg was measured as the onset temperature of the characteristic drop of the storage modulus (E’) following XXXX X0000 standard.
