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Home  >  Journal list  >  Polymer Journal  >  Vol.3  No.6 (1972)  >  pp.749-755

Polymer Journal
<<Previous article Vol.3  No.6 (1972)   pp.749 - 755 Next article>>

Effects of Temperature and Pressure on the Dielectric Constant in Non-Polar Polymers

Hiroyuki Sasabe1) and Shogo Saito1)
1) Materials Division, Electrotechnical Laboratory

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 dTgdP for polystyrene can be evaluated as 3.2×10−2 K atm−1 and dTχdP for poly(tetrafluoroethylene) as 2.3×10−2 K atm−1.


Keyword:
Dielectric Constant/ Clausius–Mossotti Equation/ Polarizability/ Glass Transition/ Crystalline Phase Transition/ Polystyrene/ Poly(tetrafluoroethylene)

Published online: March 30, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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