Pulse radiolysis of methacryloyl-l-proline methyl ester in dilute aqueous solution

E. Takács, A. Sáfrány, L. Wojnárovits, F. Marteffini, M. Yoshida, R. Katakai, S. S. Emmi, G. Beggiato, M. Carenza

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The reactions of hydroxyl radical, hydrogen atom and hydrated electron intermediates of water radiolysis with a hydrogel-forming monomer, methacryloyl-L-proline methyl ester (MA-ProOMe), were studied by pulse radiolysis in dilute aqueous solutions and compared with the reactions of the acrylic derivative (A-ProOMe). The spectral and kinetic characteristics of the first step of OH, H and eaq- reactions with the two monomers are very similar. There are considerable differences in the next steps. In neutral solutions, the electron adduct of A-ProOMe decays in slow radical-radical reactions. The adduct of MA-ProOMe, however undergoes a fast irreversible protonation resulting in α-carboxyalkyl radical. The oligomerization reactions occurring in MA-ProOMe solutions are slow, and under adopted pulse radiolytic conditions, they are observable only at high monomer concentrations. In A-ProOMe solutions the reaction is significantly faster.

Original languageEnglish
Pages (from-to)21-32
Number of pages12
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
Volume35
Issue number1
Publication statusPublished - 1998

Fingerprint

Radiolysis
Proline
Esters
Monomers
Oligomerization
Electrons
Hydrogel
Protonation
Hydrogels
Hydroxyl Radical
Acrylics
Hydrogen
Derivatives
Atoms
Kinetics
Water
acryloylproline methyl ester

Keywords

  • Hydrogel Forming Monomer
  • Hydrogen Atom and Hydrated Electron
  • Kinetic Spectroscopy
  • Pulse Radiolysis
  • Reactions Of Hydroxyl Radical

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Pulse radiolysis of methacryloyl-l-proline methyl ester in dilute aqueous solution. / Takács, E.; Sáfrány, A.; Wojnárovits, L.; Marteffini, F.; Yoshida, M.; Katakai, R.; Emmi, S. S.; Beggiato, G.; Carenza, M.

In: Journal of Macromolecular Science - Pure and Applied Chemistry, Vol. 35, No. 1, 1998, p. 21-32.

Research output: Contribution to journalArticle

Takács, E, Sáfrány, A, Wojnárovits, L, Marteffini, F, Yoshida, M, Katakai, R, Emmi, SS, Beggiato, G & Carenza, M 1998, 'Pulse radiolysis of methacryloyl-l-proline methyl ester in dilute aqueous solution', Journal of Macromolecular Science - Pure and Applied Chemistry, vol. 35, no. 1, pp. 21-32.
Takács, E. ; Sáfrány, A. ; Wojnárovits, L. ; Marteffini, F. ; Yoshida, M. ; Katakai, R. ; Emmi, S. S. ; Beggiato, G. ; Carenza, M. / Pulse radiolysis of methacryloyl-l-proline methyl ester in dilute aqueous solution. In: Journal of Macromolecular Science - Pure and Applied Chemistry. 1998 ; Vol. 35, No. 1. pp. 21-32.
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AU - Takács, E.

AU - Sáfrány, A.

AU - Wojnárovits, L.

AU - Marteffini, F.

AU - Yoshida, M.

AU - Katakai, R.

AU - Emmi, S. S.

AU - Beggiato, G.

AU - Carenza, M.

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AB - The reactions of hydroxyl radical, hydrogen atom and hydrated electron intermediates of water radiolysis with a hydrogel-forming monomer, methacryloyl-L-proline methyl ester (MA-ProOMe), were studied by pulse radiolysis in dilute aqueous solutions and compared with the reactions of the acrylic derivative (A-ProOMe). The spectral and kinetic characteristics of the first step of OH, H and eaq- reactions with the two monomers are very similar. There are considerable differences in the next steps. In neutral solutions, the electron adduct of A-ProOMe decays in slow radical-radical reactions. The adduct of MA-ProOMe, however undergoes a fast irreversible protonation resulting in α-carboxyalkyl radical. The oligomerization reactions occurring in MA-ProOMe solutions are slow, and under adopted pulse radiolytic conditions, they are observable only at high monomer concentrations. In A-ProOMe solutions the reaction is significantly faster.

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