Polymers, sulfur containing thermal properties

The stabilizing action of sulfur-containing compoimds is related to their ability to decompose peroxide and hydroperoxide groups without the formation of free radicals, as well as to their property of terminating the reaction chains in the decomposition of polymers. Sulfur-containing compounds are used in practice as thermal stabilizers, since many of them prove to be insufficiently stable to the action of ultraviolet light and can cause sensitized decomposition of the poljmaer when the composition is irradiated. There is information that the activity of mercapto derivatives, in particular, dodecyl mercaptan, in the process of thermal decomposition of pol5Tvinyl chloride, does not decrease when the temperature is raised to 190-200°C [278]. 

Since selenium shares to a certain extent similar chemical properties with sulfur, polymers containing selenium in the backbone are conceivable. The formation and thermal properties of poly(selenoformaldehyde) have been reported in literature [3]. 

The sulfur-containing polyurethane-semicarbazides are usually called poly-urethane-sulfosemicarbazides. The chemical and thermal properties of these polymers depend on the valent state of the sulfur atom included in the macro-... 

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