R. Mani et al., EFFECT OF UV IRRADIATION ON GAS-PERMEABILITY IN HETEROPHASIC ETHYLENE-PROPYLENE COPOLYMER FILMS, Journal of macromolecular science. Pure and applied chemistry, A33(6), 1996, pp. 783-787
The permeability variations of carbon dioxide, oxygen, and nitrogen th
rough isotactic polypropylene, heterophasic ethylene-propylene (E-P) c
opolymers, and polyethylene films were measured during photooxidation
using polychromatic light at 60 degrees C in air. For polypropylene-ba
sed samples the permeability decreases with increasing photooxidation,
whereas for polyethylene and an elastomeric fraction from a heteropha
sic E-P copolymer an increase in permeability with photooxidation is o
bserved.