For PHF ∆Hm° = 135 J/g, for POF ∆Hm° = 180 J/g, for PDF ∆Hm° = 198 J/g. For PDDF ∆Hm° = 232 J/g -this value has been approximated by extrapolation of enthalpy of fusion of 100% crystalline PHF, POF, and PDF polyesters as a function of the number of carbon atoms within diol unit. 6