A calorimetric study of pTS (bis-p-toluenesulphonate of 2,4-hexadiyne 1,6-diol) and its phase transitions as a function of polymerization

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Abstract
The specific heat Cp of pTS was measured from 135 to 225 K, for polymer contents 0 ≲ p ≲ 1. For p ≲ 0.01, two endotherms near 156 and 192 K limit the incommensurable phase. For p ≳ 0.01, two other transitions occur near 161 and 182 K. The corresponding enthalpies decrease from about 25 to less than 1 cal./mol, and the transitions are no longer detected for p ≳ 0.04 (182 and 192 K) and for p ≳ 0.12 (150 and 161 K). For p > 0.95 a transition is again observed near 189 K with ΔH ∼ 10 cal./mol