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Titolo:
Pulse radiolysis of acrylamide derivatives in dilute aqueous solution
Autore:
Wojnarovits, L; Takacs, E; Dajka, K; DAngelantonio, M; Emmi, SS;
Indirizzi:
Hungarian Acad Sci, Inst Isotope & Surface Chem, Chem Res Ctr, H-1525 Budapest, Hungary Hungarian Acad Sci Budapest Hungary H-1525 Ctr, H-1525 Budapest, Hungary CNR, Ist Fotochim & Radiaz Alta Energia, I-40129 Bologna, Italy CNR Bologna Italy I-40129 & Radiaz Alta Energia, I-40129 Bologna, Italy
Titolo Testata:
RADIATION PHYSICS AND CHEMISTRY
fascicolo: 4-5, volume: 60, anno: 2001,
pagine: 337 - 343
SICI:
0969-806X(200103)60:4-5<337:PROADI>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDRATED ELECTRONS; HYDROXYL RADICALS; BUTYL ACRYLATE; RATE CONSTANTS; METHACRYLATE; OH;
Keywords:
acrylamides; pulse radiolysis; rate coefficients; spectra; protonation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Wojnarovits, L Hungarian Acad Sci, Inst Isotope & Surface Chem, Chem Res Ctr, POB 77, H-1525 Budapest, Hungary Hungarian Acad Sci POB 77 Budapest Hungary H-1525 Hungary
Citazione:
L. Wojnarovits et al., "Pulse radiolysis of acrylamide derivatives in dilute aqueous solution", RADIAT PH C, 60(4-5), 2001, pp. 337-343

Abstract

The reactions of acrylamide (AAm). methacrylamide (MAAm) and N.N-dimethylacrylamide (N.N-DMAAm) with the e(aq)(-) H and OH intermediates of water radiolysis were studied in dilute solutions and compared with the reactions ofacrylic acid esters. e reacts with these compounds by adding to the carbonyl oxygen with rate coefficients of similar to1.5x 10(10)mol(-1) dm(3)s(-1). The adducts take part in complicated protonation reactions which include reversible protonation with pK(a) 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 beta -position and the adducts have absorption bands with lambda (max) = 380, 370 and 480 nm forAAm. MAAm and N.N-DMAAm. The maxima are shifted to longer wavelengths by 80-180nm compared to the spectra of adducts of acrylic acid esters. The radicals at low monomer concentrations decay in self-termination with 2k(t) = 1.1 x 10(9). 6 x 10(8) and 4x10(8) mol and 1dm(3)s(-1) disproportionation. beta -hydroxyl acrylamide-type final product forms which in alkaline solution give strong absorbance with lambda (max) approximate to 270nm. The reactions of the H atoms and the intermediates are similar to those of the OH radicals. (C) 2001 Elsevier Science Ltd. All rights: reserved.

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Documento generato il 04/12/20 alle ore 19:37:30