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Fig. 17
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Observation au microscope optique (avec un grosissement × 2,5) de la couche superficielle oxydée du PEI après différentes durées d’exposition dans l’air à 220 °C.
Examination by optical microscopy (with a magnification of × 2,5) of the superficial oxidized layer of PEI after different durations of exposure in air at 220 °C.
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