The reactions of hydroxyl radical, hydrogen atom, and hydrated electron intermediates of water radiolysis with a hydrogel monomer, acryloyl-L-proline methyl ester, were studied by pulse radiolysis in dilute aqueous solutions. In reactions of OH and H, α-carboxyalkyl radicals form; they absorb the light with a maximum at 460-480 nm, εmax ≈ 1000 mol-1·dm3·cm-1. The electron adduct reversibly protonates, and the protonated form absorbs the light with λmax = 290 nm and εmax = 8000 mol-1·dm3·cm-1. In addition to the reversible protonation, there is also an irreversible protonation which produces also α-carboxyalkyl radicals. These radicals at low concentration (0.1-1 mmol·dm-3) and high dose/ pulse (10-100 Gy) decay in second-order self-termination reactions with 2k = 3 × 108 mol-1·dm3·s-1.
|Number of pages||11|
|Journal||Journal of Macromolecular Science - Pure and Applied Chemistry|
|Publication status||Published - Jan 1 1996|
ASJC Scopus subject areas
- Ceramics and Composites
- Polymers and Plastics
- Materials Chemistry