Some investigations on the photostabilization of polypropylene

Polypropylene photo-stabilization by hindered secondary amines. A spectroscopic investigation

“…[1][2][3][4][5][6][7][8][9][10][11][12] It is now clear that during photooxidation the 2,2,6,6-tetramethylpiperidine-based additives convert through a series of products, several of which are themselves stabilizers. In particular, grafted products (substituted hydroxylamines "~N--O---C) have been suggested.…”