AbstractMolar volumes of substantially amorphous polymers may be calculated by using additive constants derived from constitutive atomic and structural parachor contributions. For 34 polymers, ranging in density from 0.83 to 2.03 g/cm3, the greatest error in the calculated molar volume compared with the measured value was 13.9, while for 30 of the polymers the error was less than ±7, with a mean error of ±3.9
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