The relationship [η] = KMa and unperturbed dimensions of the copolyesters poly(ethylene terephthalate‐co‐ethylene isophthalate) with 7.5% and 25% isophthalic structures in the main chain were determined. The experimental data proved the influence of the amount of isophthalic structures upon the values of K and a from the relation between intrinsic viscosity and molecular weight and on the values for unperturbed dimensions.
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Uglea et al. (1985) studied this question.
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