Polypropylene (PP) properties can be improved using different post-polymerization processes. In particular, the modification of the molecular structure from linear to branched enhances the melt strength and the strain hardening of polyolefins. The present work analyzes PP and propylene-ethylene copolymer (PEC) that has been slightly branched by reactive mixing. A two-step process is used consisting in functionalizing
the polymers with maleic anhydride and then generating chain linking by melt processing in the presence of a crosslinking agent.