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The best indication of the increased appeal and importance of dielectrics and insulation systems is the phenomenal growth in the volume of literature in the field during 1961, especially in the areas of ferroelectrics and conduction processes. Much of the work might be classified as “cookbook” type chemistry, however, and it appears that a more generalized definition of the problems and the fundamental...
The general format of the Digest has not been changed this year and, in keeping with the policy established last year the chapter headings are the same. The chapter on “Molecular and Ionic Interactions in Dielectrics” has been divided into two separate chapters, however, entitled “General Theoretical and Experimental Work” and “Chemistry”. It was felt by the authors that, even though a certain amount...
Because of continued interest in a chemical interpretation of electrical properties the technique of dielectric spectroscopy has been used to determine the molecular configurations of a series of symmetrical diesters of dibasic acids. From a study of the change in the dielectric constants and loss factors brought about by systematic changes in the number of carbon atoms in both the original alcohol...
In this chapter an attempt has been made to cover investigations of the electrical properties and potential insulation applications of fibrous materials and plastic films during 1960.
Continuing the trend of the past few years emphasis has been placed on the evaluation of complete insulating systems containing new combinations of known materials rather than on the application of new materials to the complex requirements of present-day insulation. Therefore, syntheses were based mainly on compound rather than molecular engineering. Much of the large volume of literature published,...
Dielectric spectroscopy has been used to elucidate the essential structure of carnauba, montan and ouricuri waxes. By analysis of the dielectric constant and loss curves as determined over a broad range of temperature and frequency, it has been possible to establish the presence of permanent electric moments in the molecules and to determine that association through hydrogen bonding exists. Polar...
There was no truly startling development in 1959, nor, fortunately, were there any serious polemics. The reaction field is still a hone of contention, and the Onsager cavity has come in for a good deal of examination. Szigeti's work in the Proceedings of the Royal Society on “Higher Order Terms in the Dielectric Constant of Ionic Crystals” is of considerable significance, and other workers in the...
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