论文信息 - Equation of State for Polystyrene

Equation of State for Polystyrene

Practical considerations emphasize the desirability of formulating an adequate equation of state for polystyrene. A fairly satisfactory one is this simplified version of van der Waals' equation, (P+π)(V−ω)=nRT, where π is the internal pressure (or cohesive energy density) and ω is the volume at absolute zero, by extrapolation. Evaluating constants from thermal expansion data and expressing P in p.s.i., V in cc per gram, and T in degrees Kelvin, this becomes (P+27,000)(V−0.822)=11.6T. Agreement with compressibility measurements, which are described in some detail, is good. Discrepancies with room temperature values of sound velocity and cohesive energy density by swelling measurements are discussed briefly.

R. S. Spencer | G. D. Gilmore | G. Gilmore

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