Empirical Determination of Intrinsic Behaviors of the Pressure, Volume, Temperature and Entropy for the Isothermal, Isobaric, Isochoric and Isoentropic Processes for Polyethylene.
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| Title: | Empirical Determination of Intrinsic Behaviors of the Pressure, Volume, Temperature and Entropy for the Isothermal, Isobaric, Isochoric and Isoentropic Processes for Polyethylene. |
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| Authors: | Saeki, Susumu1 (AUTHOR) susaekimu@ct.em-net.ne.jp |
| Source: | Journal of Macromolecular Science: Physics. 2026, Vol. 65 Issue 5, p807-818. 12p. |
| Subjects: | Isothermal processes, Isobaric processes, Entropy, Isochoric processes, Temperature, Magnitude (Mathematics), Fluid pressure, Isentropic processes |
| Abstract: | The intrinsic behaviors of the pressure (P), volume (V), temperature (T) and entropy (S) for the isothermal, isobaric, isochoric and isoentropic processes for polyethylene (PE) have been determined based on the intrinsic equation of state (Intrinsic Eos) determined by the empirical P-V-T-S Eos for PE. When a compressive outside pressure was applied to the solid-PE in the isothermal process, PT,out, the increase of the pressure followed the decrease of the volume of PE, ΔVT < 0, and the decrease of the entropy of PE, ΔST < 0, due to ΔVT < 0, which created the inside pressure of PE, PT,in, and to reach an equilibrium condition that PT,out = PT,in where ΔX = Xafter-change -Xbefore-change and X = V and S. The intrinsic behavior of the thermodynamic energies for PE in the isothermal process, such as a change of enthalpy, ΔH, were also evaluated from TΔST and ∫VTdPT. Calculations similar to those in the isothermal process were done for the isobaric, isochoric and isoentropic processes. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The intrinsic behaviors of the pressure (P), volume (V), temperature (T) and entropy (S) for the isothermal, isobaric, isochoric and isoentropic processes for polyethylene (PE) have been determined based on the intrinsic equation of state (Intrinsic Eos) determined by the empirical P-V-T-S Eos for PE. When a compressive outside pressure was applied to the solid-PE in the isothermal process, PT,out, the increase of the pressure followed the decrease of the volume of PE, ΔVT < 0, and the decrease of the entropy of PE, ΔST < 0, due to ΔVT < 0, which created the inside pressure of PE, PT,in, and to reach an equilibrium condition that PT,out = PT,in where ΔX = Xafter-change -Xbefore-change and X = V and S. The intrinsic behavior of the thermodynamic energies for PE in the isothermal process, such as a change of enthalpy, ΔH, were also evaluated from TΔST and ∫VTdPT. Calculations similar to those in the isothermal process were done for the isobaric, isochoric and isoentropic processes. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00222348 |
| DOI: | 10.1080/00222348.2025.2469359 |
