1998/08/08 by S. Commereuc, Sophie Commereuc, S. Scheirs +3 · 19 citations
Biochemistry, Genetics and Molecular Biology · Chemistry · Engineering · Materials Science · #Amine gas treating #Chemical engineering #Chemistry #Electron Spin Resonance Studies #Electron paramagnetic resonance #Fourier transform infrared spectroscopy #Lanthanide and Transition Metal Complexes #Nitroxyl #Nuclear magnetic resonance #Organic Light-Emitting Diodes Research #Organic chemistry #Peracetic acid #Photochemistry #Piperidine #Polymer #Polymer chemistry #Polypropylene #Radical #Stabilizer (aeronautics)
paper · doi:10.1002/(sici)1097-4628(19980808)69:6<1107::aid-app7>3.0.co;2-k
published in Journal of Applied Polymer Science 69(6), 1107-1114 (Wiley)
openalex publication_date 1998/08/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The stabilization mechanisms of hindered amine stabilizers (HAS) involve various oxidation products of the piperidine structure. Thus, we propose a novel method, based on electron spin resonance (ESR) spectroscopy, to check in situ the consumption of the total piperidyl species (intact HAS and all of its byproducts) in polypropylene (PP) films through photooxidation. First, the concentration of nitroxyl radicals produced upon irradiation in stabilized PP has been measured by direct ESR analysis. Then, the changes of concentration of the overall stabilizing species have been detected by indirect ESR, after conversion of the overall HAS derivatives into nitroxyl-free radicals by exposure of photooxidized PP to peracetic acid vapor at room temperature. Results were compared with those obtained by the conventional Fourier transform infrared method in the particular case of [2,2,6,6-tetramethyl piperidinyl]sebacate, and the reliability of both techniques was discussed. Thus, we assume that indirect ESR experiments consist of a easy, accurate, and very sensitive method to monitor the time evolution of a low-molecular weight HAS–NH concentration in PP upon photooxidation. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1107–1114, 1998