We proved that the chain scission reactions occur in PP and crosslinking reactions predominate for LDPE, especially over
180 C. UV irradiation intensifies these effects. We were expecting that LDPE behavior should be a combination of PP and
HDPE. In fact, the HDPE showed the biggest competition between chain-scission and crosslinking reactions, probably by
the fact of higher absorbance. In the case of LDPE, the chain-scission reactions were less intensive.