Vigilancia Tecnológica

Schematic illustrating synthesis of radical scavenging aminated polymer by reactive extrusion.AbstractWe report synthesis of a radical scavenging aminated thermoplastic polymer through reactive extrusion of polyethyleneimine (PEI) with a polypropylene and polypropylene?graft?maleic anhydride (PP?g?MA) meltblend. The reaction was confirmed using acid orange 7 (AO7) amine density assay, toluidine blue O (TBO) carboxylic acid density assay, Fourier transform infrared spectroscopy (FTIR), and a migration assay. FTIR spectra revealed a reduction of the asymmetric stretching of the maleic anhydride (MA) carbonyl group at 1777?cm?1 and the emergence of the maleimide carbonyl peak at 1702?cm?1. AO7 supported surface orientation of grafted amine groups by introduction of 7.22?nmol?cm?2 primary amines, corresponding to the reduction of surface carboxylic acids quantified by TBO from 12.46?nmol?cm?2 to 0.43?nmol?cm?2. After incubation (40°C, 10?days) in ethanol, acetic acid, and water,