HYDROBROMINATION OF POLYOCTENAMER - II - ACCESS TO NEW POLYMERIC HINDERED AMINE STABILIZERS BY NUCLEOPHILIC-SUBSTITUTION

The brominated polyethylene whose the synthesis and the properties wer e described in part I (this journal) has been used as an intermediate for the synthesis of a new polymeric hindered amine stabilizer. Nucleo philic substitution of bromine atoms was performed with 4- amino,2,2,6 ,6-tetramethylpiperidine and results in a partial grafting of tetramet hylpiperidine group in the polymer chain (approximate to 42%) together with the formation of unsaturated group (approximate to 5%). This new additive is reasonably stable itself and present good stabilizing pro perties in the photo- and the thermo-oxidation of elastomers like EPDM and polyoctenamer. (C) 1998 Elsevier Science Limited. All rights rese rved.