✍ Scribed by S. Machefer; K. Schnitzlein
No coin nor oath required. For personal study only.
A theoretical analysis was made to show that segment numbers for complex polymers can be determined by interpreting pVT data in terms of an appropriate segment‐based equation of state (EOS). Typically, experiments at high pressures have to be performed to obtain these data. In this study, pVT‐derived properties, such as compressibility and speed of sound, together with isobaric specific volume measurements were used as an alternative data source. Experiments were carried out for polyol/water mixtures of different compositions. Taking account of the polymorphism of water, segment numbers were obtained by a numerical regression analysis. Mixture viscosities were calculated using an approved segment‐based mixing rule and were in good agreement with experimental data over the temperature range of interest, indicating the validity of the determined segment numbers.
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