Studies on the Generation of Electronic Excitation States in a Riboflavin-Hydrogen Peroxide-Copper-Ascorbate Redox System Leading to Chemiluminescence and/or Aromatic Hydroxylation*

Biochemistry ◽  
1967 ◽  
Vol 6 (5) ◽  
pp. 1404-1412 ◽  
Author(s):  
Jean E. Vorhaben ◽  
Richard H. Steele
Keyword(s):  
Hydrogen Peroxide ◽  
Electronic Excitation ◽  
Redox System ◽  
Aromatic Hydroxylation

Carbon-nitride-based micromotor driven by chromate-hydrogen peroxide redox system: Application for removal of sulfamethaxazole

2021 ◽  
Vol 597 ◽  
pp. 94-103
Author(s):  
Manoj P. Rayaroth ◽  
Dasom Oh ◽  
Chung-Seop Lee ◽  
Nitee Kumari ◽  
In Su Lee ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
System Application ◽  
Carbon Nitride ◽  
Redox System

Study on Crosslinking in Diimide Reduction of Nitrile Butadiene Rubber

2006 ◽  
Vol 79 (4) ◽  
pp. 602-609
Author(s):  
Shuqin Zhou ◽  
Shaoyi Li ◽  
Huadong Bai
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Boric Acid ◽  
Esr Spectroscopy ◽  
Redox System ◽  
Nitrile Group ◽  
Crosslinking Reaction ◽  
Butadiene Rubber ◽  
Drying Process ◽  
Spectroscopy Analysis

Abstract Acrylonitrile-butadiene rubber (NBR) in latex form was selectively hydrogenated by redox system consisting of hydrazine hydrate and hydrogen peroxide, with boric acid as catalyst. Soluble hydrogenated NBR latex was obtained; but the coagulated products were gelled on drying. This problem becomes the major obstacle for the hydrogenation technique to be commercialized. It is important to study the crosslinking reaction in the system and to solve the problem. The cause for the crosslink was investigated in three possibilities: (i) crosslinking caused by the hydrogenation of CN group; (ii) by the oxidation of C=C double bonds and (iii) by radicals in the system. The control of the crosslink was also studied. The oil resistant nitrile group —CN on the polymer chain had no change during drying process. There were no signs of carbonyl group C=O formed by oxidation and amine like groups -NH- formed by the hydrogenation of CN in HNBR gel fraction. The newly formed alkoxyl radicals were detected by ESR spectroscopy analysis in the hydrogenation system after specific reaction time. Crosslinking reaction was controlled to a large extent by using hydroquinone as gel inhibitor.

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