the photolysis of the former. The amorphous region (1148 cm-1) of nylon 66
degraded faster compared with the crystalline region (935 cm-1). They also studied
the photodegradation of model amides. The imide formation was the main
observation during the photo-oxidation of both the nylons and amides, therefore,
model imide compounds were also studied. The degradation products were identical
in model amides and nylons, but model imide compounds generated carbon
monoxide and 1-butene upon photodegradation. They also studied the
photodegradation of thermally oxidized samples. Photolysis caused a decrease in
intensity of absorption between 1800 and 1700 cm-1 and also reduced the peak
intensities of ¾NH¾, ¾CH2¾, Amide I and Amide II bands. This is because of
the decomposition of short-lived emitting species formed during thermal oxidation
of nylon 66.