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Development of a competitive technique for the comparison of strong oxidation inhibitors

Citation

Tunder, Richard Steve (1961) Development of a competitive technique for the comparison of strong oxidation inhibitors. Master's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:05062010-142421533

Abstract

The mechanism of the inhibited chain oxidation of cumene has been carefully investigated in previous studies. A competitive technique for determining relative efficiencies of strong inhibitors was to be tried in this study. Such a study might extend and verify work of a similar nature on weaker inhibitors. However the relative efficiencies determined were not constant. They varied because of possible side reactions of N,N'-dipheny1-p-phenylenediamine, the inhibitor chosen as a standard. For the same reason variation of the initial concentration of the standard inhibitor caused slight unexpected deviations in the results. Hydroquinones were found to reduce N,N'-diphenyl-p-quinonimine, the oxidation product of the standard inhibitor, back to the inhibitor while stopping chains at the same time. As in previous studies, the strength of an inhibitor was found to increase with increasing ortho steric hindrance as well as with increasing electron density in the aromatic ring. Initiator concentration was found to be first order with respect to termination rate as would be expected in a chain reaction in which an inhibitor molecule stops two radical chains. The oxidation product formed from a phenolic inhibitor was found not to affect the standard inhibitor.

Item Type:Thesis (Master's thesis)
Subject Keywords:Chemistry
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hammond, George Simms
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1961
Record Number:CaltechTHESIS:05062010-142421533
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:05062010-142421533
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5778
Collection:CaltechTHESIS
Deposited By: Tony Diaz
Deposited On:10 Aug 2010 20:34
Last Modified:26 Dec 2012 03:25

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