Kinetic studies on copolycondensation processes. VI. Influence of copolycondensation temperature on tetrad distribution of the PDT/FT aromatic copolyterephthalate by 1 H‐NMR spectroscopy

1 H‐NMR and Eu(fod) 3 lanthanide shift reagent were used to determine tetrad distribution of comonomer units of the PDT/FT copolyterephthalate obtained from terephthaloyl chloride (intermonomer) and 3,3′‐dimethylbisphenol A and phenolphtalein (comonomers). Computer simulations of the terephthalic proton signal split into the lines of compositional tetrads were performed to obtain quantitative data. To characterize the microstructure of the copolymer samples synthesized at different temperatures, the degree of randomness and the degree of alternation were calculated. It was shown that the latter can differentiate the chains which seemed to be identical concerning the diad distribution only.