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- W2025420281 abstract "The heats of mixing of atactic polypropylene at infinite dilution were measured at 25°C in linear alkanes, aromatic hydrocarbons, cyclohexane, chloroform, and carbon tetfachloride. For some solvent systems excess volume and chemical potential measurements were also performed at 25°C. The results were treated by the new Flory theory for polymer solutions. The exchange interaction parameter X12 increases with an increase in the chain length of n-alkanes and decreases with the introduction of aliphatic groups into benzene. These changes can be interpreted well in terms of the difference in force field between methyl–methylene contacts or aliphatic–aromatic contacts. The observed excess volumes are negative for n-alkanes and positive for rather globular cyclohexane, chloroform, carbon tetrachloride, and benzene, which is consistent with the prediction by the theory. However, the calculated excess volumes are less than those observed for all systems studied. Agreement between experimental and theoretical χ-parameters can be achieved by the introduction of the exchange entropy parameter Q12 and adjusting the contact surface ratio (s2/s1)." @default.
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- W2025420281 date "1982-06-01" @default.
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- W2025420281 title "Thermodynamic Properties of Atactic Polypropylene Solutions" @default.
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