By Professor M. B. Neiman (auth.), Professor M. B. Neiman (eds.)
The desire for a large improvement of the creation of polymer ma terials has turn into glaring. most of these fabrics are topic to varied sorts of getting older (destruction); for that reason, stabilizers which enable the stor age, reprocessing, and use of polymer fabrics with none appreci capable switch of their houses needs to be brought into them. in recent times, this challenge of stabilizing polymers has attracted the eye of many scientists and technologists, either within the USSR and in a foreign country. The medical foundation of the international experiences may be present in a few theo retical premises, yet mainly the speculation of chain reactions with un branched chains. within the Soviet Union, the options of Academician N. N. Semenov on chain reactions with degenerate branches became the start line of theoretical reports of the stabilization and destruction of polymers. Soviet scientists have built a thought of severe concentrations of antioxidants and feature proven that the methods of stabilization have a really complicated chemical personality. the character of the polymers them selves drastically impacts those procedures and accordingly, various stabil izers are required for polymers of other buildings. additionally, it's been proven that the antioxidants used to date can't purely reason chain termination, yet may also start up oxidation and provides upward push to de generate branches.
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Extra info for Aging and Stabilization of Polymers
Vasil' eva . In this case the induction period increases greatly, but the molec- ular weight of the polymer drops catastrophically (Fig. 19). Thus, the combination of the known facts leads to the conclusion that the first assumption that antioxidants do not influence initiation is erroneous. The second premise also is doubtful - the formation of two active radicals in the decomposition of the hydroperoxide. It has been shown in a number of studies [69, 70] that hydroperoxides can decompose in solution without forming radicals, giving rise to no chain generation.
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