Abstract
Changes of dielectric constant ε in non-polar and slightly polar polymers with temperature and pressure have been analyzed in terms of the Clausius–Mossotti equation. It is concluded that the Clausius–Mossotti equation is valid for polyethylene but should be modified and expressed in the form M(ε−1)/ρ(ε+2)=(4πN0/3)×(α+μ2/3kT) for slightly polar polymers. It is also concluded from the comparison of the polarizability α for low-molecular-weight substances with α for polymers that the determining factor for α for polymers is the molecular structure of the monomer unit. ∂ε/∂T and ∂ε/∂P change suddenly at a transition point such as glass transition (Tg) and phase transition in the crystalline region (Tχ), and dTg/dP for polystyrene can be evaluated as 3.2×10−2 K atm−1 and dTχ/dP for poly(tetrafluoroethylene) as 2.3×10−2 K atm−1.
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Sasabe, H., Saito, S. Effects of Temperature and Pressure on the Dielectric Constant in Non-Polar Polymers. Polym J 3, 749–755 (1972). https://doi.org/10.1295/polymj.3.749
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DOI: https://doi.org/10.1295/polymj.3.749