Electron-beam initiated crosslinking in poly(N-isopropylacrylamide) aqueous solution

Ágnes Sáfrány, László Wojnárovits

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The reactions between the OH, H and eaq- transients of water radiolysis and a linear poly(N-isopropylacrylamide) were identified by the spectral and kinetic properties of intermediates. The radical responsible for crosslink formation is the isopropyl-centered radical that forms mainly in OH radical attack on the polymer. Below pH 3 this radical undergoes reversible protonation with pKa≈2.1. The radical decay is composed of fast and slow parts. The initial fast decay is attributed to intramolecular reactions of radicals on the same chain (loop formation), the following slow decay to competition between further intramolecular and intermolecular (H-type crosslinks) termination processes. The differences in the network formation during irradiation of aqueous monomer and polymer solutions are discussed.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalRadiation Physics and Chemistry
Volume69
Issue number4
DOIs
Publication statusPublished - Mar 2004

Keywords

  • Poly(N-isopropylacrylamide)
  • Pulse radiolysis
  • Radiation crosslinking
  • Smart hydrogels

ASJC Scopus subject areas

  • Radiation

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