ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
In the first part of this series devoted to epoxy-carboxy polycondensation, we showed that the overall mechanism of the amine catalyzed epoxy-carboxy reaction is complex. The present article studies the reaction of benzoic acid with 1-phenoxy-2,3-epoxypropane carried out in nitrobenzene and in the presence of N,N-dimethyldodecylamine as catalyst. In contrast to the results obtained in low polar solvents, where two equivalent reactions take place, the studies carried out in nitrobenzene show that, in this solvent, one of these two reactions is largely predominant. Its rate equation is: υ = k [epoxy][amine]. However, in the last steps of the reaction (conversion above 75% ), the system behaves as in low polar solvents. These results were obtained from studies carried out under stoichiometric and non-stoichiometric conditions. The overall rate constant depends only very slightly on the stoichiometric balance. This is in agreement with a major contribution of one of two competitive reactions.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1983.021840210
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