Changes in dielectric properties and thermal stability of the alpha-aluminum hydride polymorph (α-AlH3) after irradiation with electrons with an energy of 7 MeV were studied by dielectric spectroscopy, differential scanning calorimetry, thermogravimetry, and powder X-ray diffraction. Dielectric relaxation was observed in α-AlH3 samples irradiated using an electron beam with a frequency of the electric field of more than 5 MHz. The dielectric properties of α-AlH3 samples depend on the absorbed dose and the duration of time elapsed after the cessation of irradiation, while the temperature of the onset of decomposition and the kinetics of thermal decomposition of α-AlH3 samples vary little for absorbed doses up to 160 kGy. Radiation-chemical yield of the formation of the metallic phase during α-AlH3 radiolysis was determined by potentiometric titration.

A scanning electron microscopic study has shown that exposure of spheroplastics based on an organosilicon elastomer to a microsecond shock-wave pulse causes the formation of whisker structures up to 10  $$\mu$$ m long. Whisker structures are formed on the surface of fractured microspheres. Their formation is facilitated by the metallization of the surface of glass spheres. The paper presents the results of an experimental study of changes in the dielectric and mechanical characteristics of a metallized spheroplastic under shock-wave loading. Possible reasons for the formation of whiskers during shock-wave loading of spheroplastics are discussed.

The article presents experimental results of changes in the dielectric and mechanical characteristics of spheroplastics based on an organosilicon elastomer and metallized glass microspheres caused by static and shock compression. Two regions of the frequency dispersion of the dielectric constant are established that are associated with the metal coating of microspheres. It was found that both the low- and high-frequency dispersions of the complex dielectric constant decrease sharply at a relative compressive strain of no less than 70%. Possible causes of the detected change in the complex permittivity are discussed.

Представлены экспериментальные результаты изменений диэлектрических и механических характеристик сферопластика на основе кремнийорганического эластомера и металлизированных стеклянных микросфер, вызванных статическим и ударным сжатием. Установлено наличие двух областей частотной дисперсии диэлектрической проницаемости, связанных с наличием металлического покрытия микросфер. Обнаружено, что при относительной деформации сжатия не менее 70% наблюдается резкое снижение как низкочастотной, так и высокочастотной дисперсии комплексной диэлектрической проницаемости. Обсуждены возможные причины обнаруженного изменения комплексной диэлектрической проницаемости. Ключевые слова: сферопластик, микросферы, диэлектрические характеристики, механические характеристики.

This paper describes the effect of the composition of energy condensed systems, containing glycerol trinitrate, aluminum powder, ammonium perchlorate, and HMX, on their ignition in an electric field with a frequency of 50 Hz. Conditions under which energy condensed systems ignite in an alternating electric field with a frequency of 50 Hz are determined experimentally. Temperature changes of their dielectric characteristics in a frequency range from 20 Hz to 1 MHz are established. The possibilities of an electric breakdown and heating of the samples are theoretically estimated. It is revealed that electrical luminescence is observed in a polymer binder based on glycerol trinitrate and polyetherurethane.

This paper describes the experimental study of dielectric relaxation in energy condensed systems based on ether urethane rubber plasticized by glycerin trinitrate and ammonium perchlorate, HMX, and aluminum powders in the frequency range of the electric field from 40 to 1.2 · 109 Hz. Depending on the field frequency, it was possible to determine relaxation processes caused by dipole polarization, the bulk electrical conductivity of a polymer binder, and the influence of the surface of aluminum particles.

This paper presents the results of an experimental study of the dielectric relaxation of nitroglycerin in the temperature range of the liquid–solid phase transition. Measurements were performed in the electric field frequency range of 1–1264 MHz. It is shown that the dielectric relaxation of nitroglycerin includes at least two relaxation process. Possible factors that determine the temperature and frequency dependences of the complex dielectric permittivity of nitroglycerin are discussed.

The elevated radiation resistance of a microplastic based on Rusar fibres even in combined exposure to ionizing radiation and mechanical loading was demonstrated. This is probably due to the high degree of orientation of the polymer fibres, so that radiation chemical decomposition reactions are suppressed and the purely thermal effect of the radiation is experimentally recorded.