DIELECTRIC AND MECHANICAL PROPERTIES OF CROSS-LINKED POLYURETHANES WITH INTRODUCED IN SITU HETEROPOLYNUCLEAR COMPLEXES CA/CU AND SR/CU
UDC: 678.01:539.4.014:544.163.3
Keywords:
cross-linked polyurethane, dielectric properties, mechanical properties, heteropolynuclear complexesAbstract
The dielectric and mechanic properties of cross-linked polyurethanes (CPU) with introduced in situ heteropolynuclear complexes CaCu and SrCu were analyzed.
It is shown that the addition of metal complexes in polyurethane matrix leads to increasing of conductivity at direct current. Thus, the level of dielectric conductivity increases from 1 to 1.5 orders compared with the metal-free matrix. Besides, the growth of the temperature results in increasing of the conductivity of all investigated systems. This effect points on the ionic type of conductivity. Herewith, the macro chains mobility increase in polyurethanes with metal complexes compared with the metal-free matrix due to complexes formation between functional groups in polyurethane and heteropolynuclear metals' complexes.
The introduction of heteropolynuclear metals' complexes in polyurethane leads to increase in the values of tensile strength and elongation at break, compared with the corresponding values for the metal-free CPU. Thus, the values of tensile strength of polyurethanes with metal complexes grow from 4.3 to 9.2 MPa. This effect is observed due to the ability of the polyurethane functional groups interact with heteropolynuclear metal complexes. Thereby, the additional physical cross-linking nodes are created. The polyurethane, modified with heteropolynuclear complex Sr/Cu, is characterized with the highest values of tensile strength. The values of elongation at break for all polyurethane systems grow on average by 144%.
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Copyright (c) 2016 З. Гаголкіна, канд. хім. наук, Є. Лобко, канд. хім. наук, В. Клепко, д-р фіз.-мат. наук, В. Кокозей, д-р хім. наук, С. Петрусенко, канд. хім. наук, Н. Плюта, студ., В. Овсянкіна, канд. хім. наук
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