Cellulose degradation in the reaction system O-2/heteropolyanions of series [PMo(12-n)VnO40]((3+n)-)

Authors
Shatalov, AA Evtuguin, DV Neto, CP
Citation
Aa. Shatalov et al., Cellulose degradation in the reaction system O-2/heteropolyanions of series [PMo(12-n)VnO40]((3+n)-), CARBOHY POL, 43(1), 2000, pp. 23-32
Citations number
32
Categorie Soggetti
Agricultural Chemistry","Chemistry & Analysis","Organic Chemistry/Polymer Science
Journal title
CARBOHYDRATE POLYMERS
ISSN journal
01448617 → ACNP
Volume
43
Issue
1
Year of publication
2000
Pages
23 - 32
Database
ISI
SICI code
0144-8617(200009)43:1<23:CDITRS>2.0.ZU;2-O
Abstract
The degradation reactions of cellulose under conditions of dioxygen oxidati on in acidic aqueous and organic solvent-water medium in the presence of mo lybdovanadophosphate heteropolyanions of series [PMo(12-n)VnO40]((3+n)-) ha ve been investigated. The medium acidity and the heteropolyanions action we re found to be the factors causing cellulose chain scission by solvolytic a nd oxidative degradation reactions, respectively. The cellulose oxidative d epolymerisation was associated mainly with the action of VO2+ ions released from heteropolyanions via their partial dissociation under acidic conditio ns. The scheme reflecting the main pathways of cellulose degradation in the reaction system dioxygen/heteropolyanions is proposed. The effect of the m edium ionic strength on cellulose depolymerisation is discussed in the cont ext of possibilities to minimise the negative action of medium acidity and of VO2+ ions on cellulose. (C) 2000 Elsevier Science Ltd. All rights reserv ed.