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The rotational relaxation time of poly(p-phenylene benzbisthiazole) (PBT) has been used to characterize its conformation in chlorosulfonic acid solutions. We present a method of extracting the persistence length from the forward depolarized photon correlation data. Using Hearst’s theory for the rotational diffusion coefficient of a wormlike chain, a persistence length of 640 Å is determined. The results also suggest that under certain conditions depolarized photon correlation spectroscopy is a potentially useful method for estimating the polydispersity of a polymer sample.
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Crosby et al. (1981) studied this question.
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