Abstract
P—V—T relations are measured for poly(ethylene glycol) (PEG) with different molecular weights over the temperature range from −40° to 210°C and for poly(tetrahydrofuran) (PTHF) from −40° to 170°C. The thermal expansion coefficient α, the compressibility β, and the internal pressure Pi are obtained and their temperature dependence is related to the molecular weight. The α and β of liquid PEG do not depend strongly on the molecular weight. On the other hand, the α of solid PEG becomes larger as the molecular weight increases, whereas the β is almost independent of molecular weight. These facts manifest themselves in the behavior of the internal pressure. In the liquid state the internal pressures of higher-molecular-weight PEG are approximately proportional to the second power of the reciprocal volume, but those of low-molecular-weight PEG and PTHF deviate from this rule. The results of internal pressure measurements are analyzed in terms of the theorem of corresponding states.
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Tsujita, Y., Nose, T. & Hata, T. Thermodynamic Properties of Poly(ethylene glycol) and Poly(tetrahydrofuran). I. P—V—T Relations and Internal Pressure. Polym J 5, 201–207 (1973). https://doi.org/10.1295/polymj.5.201
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DOI: https://doi.org/10.1295/polymj.5.201
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