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- W2053197510 abstract "Dielectric measurements (5Hz–8.5 GHz) at temperatures from –30 to 100°C have been made on polar solutes molecularly dispersed in a polystyrene matrix. Rigid molecules of varying size and shape (camphor, anthrone, cholest-4-en-3-one, tetraphenyl cyclopentadienone) and β-naphthol are considered. By 80° all the molecules show their full dipole moments in polystyrene : the apparent (Eyring) activation energies ΔH*E for molecular dipole relaxations vary from 0.9 kcal mole–1 for camphor to 130 kcal mole–1 for tetracyclone. The apparent ΔH*E over limited temperature ranges themselves reflect changes in the polymer matrix relaxations, and the 130 kcal mole–1 value may well be derived from the glass-transition process. The ΔH*E and ΔS*E correlate linearly and the former is dependent upon the molecular rotational volume. The “whole molecule” and hydroxyl group rotations are well resolved for β-naphthol with ΔH*E values of 11.2 and 0.5 kcal mole–1 respectively." @default.
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- W2053197510 date "1967-01-01" @default.
- W2053197510 modified "2023-10-17" @default.
- W2053197510 title "Dielectric studies of mobility of polar molecules in polystyrene" @default.
- W2053197510 doi "https://doi.org/10.1039/tf9676302163" @default.
- W2053197510 hasPublicationYear "1967" @default.
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