Abstract
The molecular optical anisotropy of isotactic and atactic polystyrene, and their oligomers has been interpreted according to the rotational isomeric state model. The results obtained allowed us to determine the statistical weights of meso- and racemic 2,4-diphenylpentane and the respective orientation of the phenyl rings in these molecules. Analysis also showed that isotactic polystyrene in solution had the same local conformation as the meso pentane. This conformation consisted of a succession of very long helical segments of type 31. In the case of atactic polystyrene a conformation of identical nature was found, though the length of isotactic sequences was much smaller.Finally, this study shows that it has been possible to interpret, by means of conformational parameters of model compounds, all the experimental values observed for isotactic and atactic polymers, thus pointing out the utility of depolarized Rayleigh Scattering as a method for the determination of the average conformation of polymers as well as that of short chains.
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Fourche, G., Lemaire, B. Depolarized Rayleigh Scattering and Stereoregularity of Polystyrene Chains. II. Interpretation. Polym J 4, 476–488 (1973). https://doi.org/10.1295/polymj.4.476
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DOI: https://doi.org/10.1295/polymj.4.476