The specific volumes of anionic polystyrenes with molecular weights between 9,000 and 700,000 have been measured at 170–237°C. The volumes attributable to end groups differ between anionic and thermally initiated polystyrenes. Uncertainties in average molecular weights of short chain polymers have a critical influence on conclusions as to the influence of molecular weight and temperature on polymer melt density and related phenomena.
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Chee et al. (1973) studied this question.
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