Pulse radiolysis of acrylamide derivatives in dilute aqueous solution

L. Wojnárovits, E. Takács, K. Dajka, M. D'Angelantonio, S. S. Emmi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The reactions of acrylamide (AAm), methacrylamide (MAAm) and N,N-dimethylacrylamide (N,N-DMAAm) with the eaq-, H and OH intermediates of water radiolysis were studied in dilute solutions and compared with the reactions of acrylic acid esters. eaq- reacts with these compounds by adding to the carbonyl oxygen with rate coefficients of ∼1.5×1010mol-1dm3s-1. The adducts take part in complicated protonation reactions which include reversible protonation with pKa values between 7.8 and 9.3 with the H3O+ ions or with the H2O molecules and irreversible protonation with H2O. The OH radicals add to the double bond of the monomers in β-position and the adducts have absorption bands with λmax=380, 370 and 480 nm for AAm, MAAm and N,N-DMAAm. The maxima are shifted to longer wavelengths by 80-180 nm compared to the spectra of adducts of acrylic acid esters. The radicals at low monomer concentrations decay in self-termination with 2kt=1.1×109, 6×108 and 4×108mol-1dm3s-1. In disproportionation, β-hydroxyl acrylamide-type final product forms which in alkaline solution give strong absorbance with λmax≈270 nm. The reactions of the H atoms and the intermediates are similar to those of the OH radicals.

Original languageEnglish
Pages (from-to)337-343
Number of pages7
JournalRadiation Physics and Chemistry
Volume60
Issue number4-5
DOIs
Publication statusPublished - 2001

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radiolysis
adducts
aqueous solutions
acrylic acid
pulses
esters
monomers
absorption spectra
decay
oxygen
coefficients
products
wavelengths
water
atoms
molecules
ions

Keywords

  • Acrylamides
  • Protonation
  • Pulse radiolysis
  • Rate coefficients
  • Spectra

ASJC Scopus subject areas

  • Radiation

Cite this

Pulse radiolysis of acrylamide derivatives in dilute aqueous solution. / Wojnárovits, L.; Takács, E.; Dajka, K.; D'Angelantonio, M.; Emmi, S. S.

In: Radiation Physics and Chemistry, Vol. 60, No. 4-5, 2001, p. 337-343.

Research output: Contribution to journalArticle

Wojnárovits, L. ; Takács, E. ; Dajka, K. ; D'Angelantonio, M. ; Emmi, S. S. / Pulse radiolysis of acrylamide derivatives in dilute aqueous solution. In: Radiation Physics and Chemistry. 2001 ; Vol. 60, No. 4-5. pp. 337-343.
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