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Mechanochemical synthesis of polypropylene-based macromolecular stabilizers
Summary
Researchers developed a solvent-free, mechanical grinding method to chemically attach stabilizing additives directly onto polypropylene plastic, creating more durable materials without harmful solvents — an advance in making plastic manufacturing cleaner and safer.
A mechanochemical process is proposed as an innovative approach to the synthesis of polypropylene-based macromolecular stabilizers with outstanding thermal behavior. Properly designed butylated hydroxytoluene antioxidants (BHT) and hindered amine light stabilizers (HALS) are covalently linked to polypropylene grafted with maleic anhydride (PP- g -MA) using a ball-mill apparatus under mild and solvent-free conditions. The study reports a quantitative evaluation of the degree of functionalization based on ATR-FTIR quantification technique and the solid-state NMR spectroscopy characterization of the ensuing materials. This strategy is a significant step towards safe and sustainable chemical synthesis in the field of macromolecular materials. The covalent linking of suitable stabilizing units to a maleic anhydride grafted polypropylene by a solvent free mechanochemical process carried out in a ball milling system. The study reports ATR-FTIR and solid-state NMR spectroscopy techniques for quantification and characterization of the ensuing materials. Institute and/or researcher Twitter usernames: @CViglianisi; @UNI_FIRENZE; @cnr_scitec. • Sustainable chemical functionalization of maleic anhydride grafted polypropylene. • Quantitative evaluation of the degree of functionalization based on ATR-FTIR quantification technique. • Solid-state NMR spectroscopy characterization of the macromolecular materials. • Mechanochemical synthesis of macromolecular stabilizers under mild and solvent-free conditions.
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