Abstract
Abstract1‐Acryloyl‐4‐acryloyloxy‐2,2,6,6‐tetramethylpiperidine (AATP) has been covalently attached to polypropylene under conditions of reactive processing to give substantial concentrations of essentially 100% grafted antioxidant (AATP‐B). Solution of the concentrates showed that at high concentration of grafted antioxidant some homopolymerized AATP was present and the polymer undergoes transient cross‐linking during processing. Concentrates of bound AATP (AATB‐B) when used as conventional additives for polypropylene are very effective photoantioxidants due to conversion to the related polymer‐bound nitroxyl radicals by photosensitized oxidation. A typical commercial hindered phenol, Irganox 1076, when used at low concentration in combination with ‐B also acts as a photosensitizer for nitroxyl formation. Unlike low molar mass‐hindered piperidinoxyl, polymer‐bound nitroxyls are effective thermal antioxidants that synergize very effectively with low concentrations of Irganox 1076.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.