A relation for calculating the energy fraction fu/f in open systems has been analyzed from the viewpoint of the precise determination of the length of nondeformed sample Lo and its temperature dependence. An iterative method has been proposed for determining the fu/f and thermal coefficient of volume expansion βs and Lo. Various methods for determining fu/f of dry samples have been applied to open systems.
Effect of diluent on the thermoelastic properties of ethylene-vinyl acetate copolymers was investigated. Dcpendence of the value of ru/f on the thermal coefficient of volume expansion p8, which is a linear function of the thermoelastic point of inversion, was determined. In the case of :I homologous series of diluents values of f,/f were correlated with molar refraction of the diluents used. At determinations of f u / f in the dry state it was found that the values of f,/f are not an additive quantity of the chemical composition of ethylene-vinyl acetate copolymers and that they have maximum values a t the compositions about 50 mole-%.
Untersuchung der thermoelastischen Eigenschaften von Polymeren in offenen Systenien: Einflup des Verdunnungsmittels auf das Energieverhultnis fu/fDer EinfluB des Verdunnungsmittels auf die thermoelastisehen Eigcnschaften von Ethylen-Vinylacetat-Copolymeren wurde untersucht. Die Abhangigkeit des Wertcs von f u / f vom thermischen Volumenausdehnungskoeffizienten pa, der eine lineare Funktion des thermoelastisehen Urnkehrpunktes ist, wurde bestimmt. Fur eine homologe Reihe von V A~O and ROMANOV: Study of the thermoelastic properties of polymers in open systems Acta Polymerica 35 (1984) Nr. 9The TSDC-spectra of Kapton-H thermoelectrets in the temperature range 303 to 573 K show three maxima, denoted by j3, a and e, with respective locations around 373, 453 and 553 K and activation energies of 0.14 to 0.34 eV, 0.32 to 0.78 eV and 1.0 to 1.5 eV. These maxima are caused by dipole-orientation, space-charge motion and surface-charge l)
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