The length of the span of the terephthaloyl residue in poly(ethylene terephthalate) guarantees independence of the conformations of successive repeating units of the chain. Interactions within units of the chain are amenable to interpretation by comparisons with related polymers; cis and trans conformations of the terephthaloyl residue are given equal weighting. The mean‐square dimension ratio (〈 r 2 〉 0 / M ) ∞ estimated on this basis is in substantial accord with the value deduced from experiments.
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Williams et al. (1967) studied this question.
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