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- W3021348382 abstract "Results of viscometric and osmotic measurements as well as solubility experiments with isotactic and atactic polystyrene fractions are reported.The fractionation of isotactic polystyrene, in spite of its crystallizability, can be carried out by the usual techniques of fractional precipitation at ordinary temperatures. This is possible because of its state of metastability in solution and its low kinetic tendency toward crystallization.The relation between [η] and M in benzene and in toluene was found to be the same for the two types of polymer. On the other hand, the second virial coefficients ? (in toluene) are appreciably different. Calculated values of the “limiting interaction affinity” QE in toluene and the results of solubility experiments in MEK and in toluene-methanol mixtures show that atactic polystyrene is always more soluble than isotactic polystyrene, regardless of whether the latter is in the crystalline or in the amorphous (metastable) state. MEK is shown to be a selective solvent in the separation of the two types of polystyrene. The value of B or φE is suggested as a possible measure of the isotacticity." @default.
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- W3021348382 date "1967-01-01" @default.
- W3021348382 modified "2023-09-27" @default.
- W3021348382 title "SOME SOLUTION PROPERTIES OF ISOTACTIC AND ATACTIC POLYSTYRENES" @default.
- W3021348382 doi "https://doi.org/10.1016/b978-1-4831-9883-5.50026-x" @default.
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