Abstract
AbstractThe influence of a polystyrene (PS) content of 1–5% in PVC films on their thermal stability, permeability of air and photooxidation, crosslinking, and photodehydrochlorination induced by 253.7 nm wavelength radiation was investigated.It was found that a small amount of PS in PVC films causes an increase of the permeability of air through these films and does not affect their thermal stability, but evidently improves their photochemical resistance hampering the photodehydrochlorination, crosslinking and photooxidation of PVC.These degradation processes change the thermal stability of the samples. Smaller changes observed in samples containing PS confirm its photostabilizing effect on PVC. Visible differences between the values of thermal parameters depending on the efficiency of photochemical reaction point out the sensitivity of derivatographic measurements on conversion of PVC caused by UV‐radiation.
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