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Mechanochemical conversion of PP with untreated grinding spheres proceeds via radicals. (A) Milling chamber, fracture mechanism, and mechano-radical formation. (B) Molar mass distributions before and after milling waste PP for 10 and 60 h with untreated ZrO2 spheres. (C) Mass-normalized ESR spectra after milling model PP with 50 mg nitrosobenzene for 5, 10, and 30 min. (D) Quenching of propene formation with 10 wt % t-BHT, while milling HMW PP with untreated ZrO2 spheres.
