In the present work, the spectra of currents of thermostimulated depolarization for composite corona electret LDPE + ϕ vol % TlInSe 2 are obtained by the thermoactivation spectroscopy method [11] and their electret properties and change conditions are investigated.

The gas-sensitivity of gelatin/Cu 2 S and gelatin/CdS samples under the effect of vapors of different solvents and ethyl alcohol has been investigated. It is shown that composites on the basis of polymers with Cu 2 S and CdS nanoparticles are sensitive to vapors of different solvents. The gas sensitivity of the nanocomposites depends on the rate of matrix filling and the chemical data of the testing gas. These materials could be used as a sensitive element in different gas sensors and detectors.

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The dielectric properties of polymer composites on the basis of polyethylene and polypropylene with TlInS 2 semiconductor filler are investigated. It is shown that the changes in these properties that were observed are caused by polarization processes occurring on the polymer-filler interface.

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