Journal of Applied Polymer Science, Vol.72, No.2, 215-225, 1999
Morphology of photodegraded heterophasic ethylene-propylene copolymers
The morphology of photooxidative degraded films of heterophasic ethylene-propylene copolymer (EPQ-30R) was investigated and compared with isotactic polypropylene and linear low-density polyethylene by scanning electron microscopy. Surface damage caused by polychromatic ultraviolet irradiation (lambda greater than or equal to 290 nm) at 55 degrees C in air is presented in different micrographs. Changes occurring due to the formation of polar groups during photooxidative degradation are discussed. Morphological study of these photodegraded polymer samples show very good correlation with the photodegradation results. The rate of photooxidation is very fast in case of isotactic polypropylene, compared with polyethylene and ethylene-propylene copolymers.