Figure 6
The composite image contains two panels labeled a and b. Panel a presents two rectangular resin specimens placed beside a ruler with centimetre markings, labelled N5 and N5 SW, where the N5 SW specimen includes a visibly altered central region compared with N5. Panel b presents infrared reflectance spectra with reflectance in arbitrary units on the vertical axis and wavenumber in inverse centimetres on the horizontal axis, showing two curves labelled N5 and N5 SW. Dashed vertical markers identify absorption regions associated with hydroxyl and carbonyl groups, and differences between the two spectra indicate chemical changes after seawater exposure.Picture of original vitrimer N5 sample and sample after self-welding N5.SW (a), FTIR spectra of vitrimer N5 and N5.SW (b)