Towards high-performance polypropylene and its random copolymer: Insight into toughening mechanism of supercritical carbon dioxide assisted annealing.

Highlights: [•] ScCO2-assisted annealing was adopted to toughen polypropylene for the first time. [•] Polypropylene with well-balanced mechanical properties was prepared. [•] Polypropylene random copolymer with superior toughness was prepared. [•] Toughening mechanism of scCO2-assisted annealing was proposed. [ABSTRACT FROM AUTHOR]