It is shown that the partial polymerization of liquid sulfur which occurs on heating to temperatures above 159°C is initiated by free radicals originating from the homolytic dissociation of the cyclic molecules S6 and S7 whose first dissociation enthalpies are calculated from thermodynamic data as 124 and 127 kJ/mol, respectively.
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Ralf Steudel (1983) studied this question.
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