| Abstract: | The composition of polyester polyols derived from terephthalic acid (TPA) and diethylene glycol (DEG) was examined. The synthesis of individual oligomers 1 , n is described. The compounds were characterized with 1H and 13C NMR, mass spectrometry, and elemental analyses. The resonance signals arising from aromatic protons in 1 , n = 1–3 were identified in 1H NMR spectra of TPA‐DEG condensates. From 1H NMR studies and chromatographic separation, it was concluded that the condensation of TPA and DEG in a 1:2 molar ratio results in a mixture of linear oligomers 1 with the average ñ varying from 1.1 to 2.2, and containing about 2% of cyclic oligomer 2 . © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1114–1123, 2003 |
