Asymmetrically phenyl substituted polyesters are soluble even when terphenyl ( 1 ) or quinquephenyl ( 2 ) moieties are introduced in the main chain. The polymers were fractionated from 1,1,2,2-tetrachloroethane solutions with methanol. The fractions obtained were studied in detail by viscosimetry, light scattering, and size-exclusion chromatography (SEC). A conformational analysis in solution was performed by treating the intrinsic viscosities as a function of molecular weight. The results obtained gave a Kuhn length of 224 Å for polyester 1 and 340 Å for polyester 2 . These results show that in dilute solutions the polyesters studied do not behave as perfect rigid rods. However, the persistence length values obtained here are considerably higher than those derived for substituted aromatic polyesters.
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Kakali et al. (1996) studied this question.
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