Year: 1972
Type: article
Abstract: The degradation of polymers induced by the presence of metal compounds is a complicated reaction.That is why the reactions of low molecular model compounds have been chosen for systematic studies.The extent of present knowledge about the reactions of metal compounds in non-polar media is so far quite restricted.The metal compounds can act both as the oxidation and reduction agent in the initiation process.Studies on the oxidation of various substrates with cobalt(m) complexes in the absence of oxygen have revealed that, in some cases, the radicals formed in the first step are either quickly oxidized or recombine.The course of reaction in an oxygen atmosphere can be substantially influenced by small changes in the structure of the ligands.Moreover, even trace amounts of polar compounds can play an important role.It follows, from the correlation of activation energies with activation entropies, that the reactivity of oxidation agents can be weil correlated both for aqueous and for non-polar media.Molecular oxygen fits weil in this correlation.During the reduction initiation, a typical example being the reaction of cobalt(n) with peroxide, complex-bonded radicals are formed in non-polar media.The reactions of these radicals with various polar substrates and other metal-containing compounds have been studied.
Source: Pure and Applied Chemistry
Institution: Polymer Institute Brno (Czechia)
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2065833985