CALORIMETRIC STUDY OF pTS (BIS-P-TOLUENESULPHONATE OF 2,4-HEXADIYNE 1,6-DIOL) AND ITS PHASE TRANSITIONS AS A FUNCTION OF POLYMERIZATION.

The specific heat C//p of pTS was measured from 135 to 225 K, for polymer contents 0 less than equivalent to P less than equivalent to 1. For P less than equivalent to 0. 01, two endotherms near 156 and 192 K limit the incommensurable phase. For P greater than equivalent to 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 greater than equivalent to 0. 04 (182 and 192 K) and for P greater than equivalent to 0. 12 (150 and 161 K). For P greater than 0. 95 a transition is again observed near 189 K with DELTA H approximately 10 cal. /mol.