年間 4 号発行
ISSN 印刷: 2572-4258
ISSN オンライン: 2572-4266
Indexed in
SMART MATERIALS WITH ELECTRICALLY CONTROLLED PROPERTIES. ELECTRORHEOLOGICAL SUSPENSIONS WITH A NANOSIZED POLYMERIC DISPERSED PHASE. PART 2. EXPERIMENTAL INVESTIGATION OF ELECTRORHEOLOGICAL SUSPENSIONS BASED ON POLYIMIDES
要約
The electrorheological properties of a new generation of "smart materials", namely, electrorheological suspensions (ERS) based on nanosized polymeric particles of polyimides in the medium of methyl silicone, are discussed. The optimal structures of polyimides with a high electrorheological response were predicted within the framework of quantum mechanical investigations on the previous stages of the authors' research (Yanovsky et al., 2011) and synthesized at the Federal Budget State Research Establishment "Institute of Applied Mechanics of the Russian Academy of Sciences". For the obtained polyamide particles with a different chemical structure, the electrophysical properties (sizes of particles and of their aggregates, size distribution, specific surface, double electric layer potential, electrorheological response on shear in electric fields of different intensities) were investigated. The chemical composition of polyimides with optimal electrorheological characteristics has been established. Based on these specimens, electrorheological suspensions with different concentrations of the dispersed phase have been obtained. For the first time, the curves of flow, dynamic rheological characteristics, namely, the moduli of elasticity and losses, loss-angle tangent of similar electrorheological suspensions based on nanosized particles of polyimides were described in a wide range of rheological parameters: the rates of shearing, frequencies of periodic sinusoidal small-amplitude deformation, and temperatures at different concentrations of dispersed phase. The presence of a high-power electrorheological effect in these materials as compared to the electrorheological suspensions based on microsized suspensions, as well as a slight dependence of the electrorheological characteristics on temperature up to 80°C were noted. The results obtained open up prospects for wide practical application of this type of materials.