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Titolo:
DEGRADATION OF SYNTHETIC WATER-SOLUBLE PO LYMERS WITH L-ASCORBIC-ACIDOXYGEN
Autore:
AOKI S; UEBAYASHI H;
Indirizzi:
OSAKA CITY UNIV,FAC ENGN,DEPT APPL CHEM,SUMIYOSHI KU OSAKA 558 JAPAN
Titolo Testata:
Nippon kagaku kaishi
fascicolo: 10, , anno: 1995,
pagine: 816 - 822
SICI:
0369-4577(1995):10<816:DOSWPL>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
JPN
Soggetto:
DNA-BREAKING ACTIONS; SCISSION ACTIVITIES; TRIOSE REDUCTONE; COPPER-ION; PROTEIN; DEPOLYMERIZATION; TRYPTOPHAN; RESIDUES; CU-2+;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
S. Aoki e H. Uebayashi, "DEGRADATION OF SYNTHETIC WATER-SOLUBLE PO LYMERS WITH L-ASCORBIC-ACIDOXYGEN", Nippon kagaku kaishi, (10), 1995, pp. 816-822

Abstract

The degradation of several synthetic water-soluble polymers, such as poly(sodium acrylate) (PSA), poly(sodium methacrylate) (PSM), poly(sodium 2-ethylacrylate) (PSE), polyacrylamide, and poly(ethylene oxide), with L-ascorbic acid (ASA) was investigated in a phosphate buffer solution adjusted at pH 7 at 30 degrees C under introduction of air of constant flow rate. The progress of degradation was monitored by the reduction of relative viscosity of the reaction system. All these polymerswere degraded easily. The degradability of the acrylate polymers increased in the order; PSE<PSA<PSM. The extent of consumption of ASA in these systems determined by the decrease in UV absorption based on ASA also increased in the order of PSE<PSA<PSM<control, so these polymers suppressed the oxidation of ASA. The initiation mechanism of the polymer degradation is discussed; ASA/O-2 generates hydroxyl radical duringthe oxidation process, and the hydroxyl radical abstracts hydrogen atom from the polymer at alpha-position of the substituent of the monomer unit, or the hydroxyl radical accepts one electron from the carboxylate anion to generate the acyloxyl radical followed by decarboxylation, especially in the case of PSM. The activity of ASA/O-2 in the polymer degradation was found to be significantly high as compared with commercial hydrogen peroxide. Thus, ASA/O-2 would be effective for waste polymer treating agent.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 17:16:28