EPR Study of Backbiting in the Aqueous-Solution Polymerization of Acrylamide.
Via electron paramagnetic resonance (EPR) spectroscopy, the type of radicals occurring during acrylamide (AAm) homopolymerization in aqueous solution is investigated between -5 and +100 °C. The radicals are produced photochemically under stationary conditions. Midchain AAm radicals (MCRs) are clearly identified by EPR which demonstrates that secondary propagating AAm radicals (SPRs) undergo backbiting reactions. Above 50 °C, the fraction of MCRs even exceeds the one of SPRs. The extent of backbiting is however well below the one in butyl acrylate polymerization at identical temperature.
Institut für Physikalische Chemie, Georg-August-Universität Göttingen, Tammannstr. 6, D-37077, Göttingen, Germany.
Hendrik
H
Kattner
Institut für Physikalische Chemie, Georg-August-Universität Göttingen, Tammannstr. 6, D-37077, Göttingen, Germany.
Michael
M
Buback
D000180:Acrylic Resins / Q000032:analysis / Q000138:chemical synthesis* / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D006358:Hot Temperature; D000099166:Polyacrylamides
D000180:Acrylic Resins; D000099166:Polyacrylamides
EPR/ESR; acrylamide; backbiting; polymer kinetics; polymers; radical polymerization