Effect of the D. desulfuricans bacterium and UV radiation on nitrocellulose oxidation

The oxidation of nitrocellulose (NC) containing 13.38% nitrogen has been investigated. The oxidation process under the action of hard UV radiation and ozone has been conducted for 27 h. As result, the nitrogen content of NC has decreased by less than 4.0%. For oxidation using Desulfovibrio ( D .) de...

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Published inRussian journal of physical chemistry. B Vol. 11; no. 4; pp. 697 - 703
Main Authors Khryachkov, V. A., Saratovskikh, E. A., Yarullin, R. N., Kulikov, A. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.07.2017
Springer Nature B.V
Subjects
Bacteria
Cellulose esters
Cellulose nitrate
Chains (polymeric)
Chemical bonds
Chemical Physics of Ecological Processes
Chemistry
Chemistry and Materials Science
Degree of polymerization
Globules
Nitrogen
Oxidation
Ozone
Physical Chemistry
Polymerization
Pretreatment
Ultraviolet radiation
UV radiation
bacterium
nitrocellulose
biological oxidation
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Summary:The oxidation of nitrocellulose (NC) containing 13.38% nitrogen has been investigated. The oxidation process under the action of hard UV radiation and ozone has been conducted for 27 h. As result, the nitrogen content of NC has decreased by less than 4.0%. For oxidation using Desulfovibrio ( D .) desulfuricans sulfate-reducing bacteria, NC has been incubated with these bacteria for 65 days. This processing has reduced the nitrogen content of NC by 1.66–2.8%. D. desulfuricans incubation with NC pretreated with UV light + ozone has decreased the nitrogen content of the sample by at most 2.75% (compared to the baseline). UV + ozone pretreatment enables subsequent NC oxidation by D. desulfuricans : the resulting samples are richer in low-molecular-weight fractions and nitrate and nitro groups, and they reach their maximum extent of oxidation within 16 h of incubation with the bacteria, whereas the untreated samples oxidize to the maximum extent in 38 h. It is likely that the UV + ozone treatment cleaves carbon–carbon bonds in the polymer chain and lowers the degree of polymerization of individual chains, thereby facilitating the penetration of bacteria into the bulk polymer globules and the bacterial oxidation of ester bonds.
ISSN:1990-7931
1990-7923
DOI:10.1134/S1990793117040169