<p>This study investigates the synthesis of linear symmetric homopoly(ester carbonate)from diester diols and their diphenyl dicarbonates by melt polycondensation approach. A first pre-condensation step at 215–220 ºC under a stream of dry argon followed by melt polycondensation at 215–220 ºC or 240 ºC under vacuum. The ¹³C-NMR spectra substantiated the attainment of symmetric polymers. Two 13C-NMR pieces of evidence were presented: single line peaks for the carbonyl carbon signals for both ester and carbonate groups and the appearance of proton-carbon 2D-HMBC correlations. Half of the formed polymers are symmetric, while the rest showed ¹³C NMR splitting, indicating the formation of non-symmetric polymers. The T_g values of the polymers ranged from –30 to 159 ºC. Contradictory to the known tendency, two symmetric polymers containing ether linkages had T_g values higher than polymers with comparable chemical structures that do not have an ether bond. This observation was credited to the effect of intermolecular attractive forces in symmetric polymer chains. Thermal stability studies indicated that the polymers have good thermal stability, with 1% mass loss temperature ranging from 97 to 349 ºC.</p>