Abstract
AbstractA theory of the ring‐chain equilibrium in liquid selenium is presented which is mathe‐matically identical to our theory for polymer equilibrium in liquid sulfur. The numerical treatment is based on: (a) the entropy and enthalpy of the propagation reaction (Sen* + Se8 ⇌ Sen+8*, the asterisk denoting a diradical) which were calculated from values of the Se8 concentrations in the liquid as given in the literature, and (b) the entropy and enthalpy of the initiation reaction (Se8 ⇌ Se8*) which were estimated by comparison to the sulfur values. The “transition” temperature for the appearance of polymer in the liquid state is calculated as 83°C. (134° below the melting point of selenium), and the chain length at the melting point is estimated as ca. 1300 Se8 units.
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