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Dielectric relaxation of some rigid polar molecules in a polystyrene matrix

โœ Scribed by H.A. Khwaja; S. Walker


Publisher
Elsevier Science
Year
1981
Weight
866 KB
Volume
19
Category
Article
ISSN
0378-4487

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โœฆ Synopsis


Dielectric absorption studies have been carried out on solutions of twelve polar solutes dispersed in an atactic polystyrene matrix over a range of temperatures in the frequency region 50 to 105Hz and in one case also in the range of 104 to 107Hz. Rigid molecules of varying size and molecular dipole momentshaiobenzenes, p-halotoluenes, p-halobiphenyls, p-nitrobiphenyl and p-bromoethyl benzene -have been examined. All these solute molecules have in common the fact that the molecular dipole moment lies along the main principal axis. ascribed to molecular or intramolecular or overlap of the two relaxation processes. entropy of activation for camphor, anthrone, tetracyclone, and the molecular process of 8-naphthol. By the use of their data, together with Levi 's data, (ref. 3) a linear relationship between AHE and ASE was found. By plotting of activation enthalpy against rotational volume for these molecules, Davies and Edwards obtained evidence for a linear relation between these two parameters,


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