Gr. Saad et al., DIELECTRIC AND MECHANICAL-PROPERTIES IN THE PHOTODEGRADATION OF POLY(VINYL BUTYRAL) FILMS, Polymer degradation and stability, 47(2), 1995, pp. 209-215
The dielectric behaviour of unirradiated and irradiated PVB films, usi
ng UV radiation, was investigated as a function of temperature and fre
quency. The results obtained are discussed in terms of the dielectric
parameters epsilon('') (max,) Delta epsilon, beta and Delta E. These e
xperimental results, in combination with the temperature dependence of
dynamic mechanical measurements in the tensile mode and with d.s.c me
asurements, show that during UV irradiation of PVB, besides other chan
ges, cross-linking predominates. A mechanism of photodegradation has b
een proposed and is supported by gel content determination and IR spec
tra.