Polylactide TG curves (Fig. 2) indicate a reduction of
sample decomposition temperatures along with the
increase in photodegradation time. Before exposure to UV
radiation, the decomposition temperature of the PLA
sample at 10 % mass loss equalled 334.4 C and decreased
to 260.8 C after 16 h of irradiation. At 50 % mass loss,
the difference in temperatures between the initial PLA
sample and the sample irradiated for 16 h equalled
29.4 C. Temperatures in the case of polylactide and
polylactide with a PCL addition, before and after different
periods of irradiation (2, 4, 8, 16 h), at 10 and 50 % mass
loss in the function of temperature as well as the temperature
difference between the initial sample and the sample
after 16 h of exposure (DT) have been depicted in Table 2.