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Random copolyesters were prepared from dimethyl terephthalate, ethylene glycol (EG), and propane-1,3-diol (PrG) by melt-poly-condensation techniques, using varying amounts of EG and PrG. Compositions have been established by proton NMR spectroscopy. Intrinsic viscosity and number-average molecular weight were measured. Thermal properties have been studied by differential thermal analysis. Melting and degradation temperatures and thermodynamic parameters are discussed in terms of structural differences, particularly the effect of composition and chain flexibility.
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Ponnusamy et al. (1985) studied this question.
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