Influence of Distribution Anisotropy and Particle Shape on Magnetorheological Properties of Magnetoactive Elastomersстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.
Аннотация:Viscoelastic properties of magnetoactive elastomers with spherical and plate-shaped filler havebeen studied. Four series of samples based on silicone elastomer and carbonyl iron microparticles have beenprepared. A series of samples with a concentration of magnetic filler from 30 to 60 wt % which differed in theshape of filler particles (spherical and platelike) and in their distribution in the polymer matrix (isotropic andanisotropic). The magnetorheological properties of the obtained magnetoactive elastomers have been examinedby dynamic mechanical analysis. Storage modulus values for samples of different compositions are in therange of 10–100 kPa. It has been shown that anisotropic materials are stiffer than the isotropic counterpartsand demonstrate a higher magnetorheological effect: the increase in the elastic modulus of an anisotropicsample with the maximum filler content exceeds an order of magnitude in a magnetic field of 1 T. At the samefiller concentrations, materials based on platelike iron are stiffer than those based on spherical iron. At lowmagnetic filler concentrations, the use of platelike iron makes it possible to achieve a higher magneticresponse of the material; at high filler concentrations, the increase in the elastic modulus is greater for samplesbased on spherical particles. The anisotropic materials exhibit a more pronounced Payne effect.
FUNDING
NMR and GPC studies were carried out at the Shared-
Use Center “Polymer Research Center” of the Enikolopov
Institute of Synthetic Polymer Materials of the Russian
Academy of Sciences with the support of the Ministry of
Science and Higher Education of the Russian Federation,
topic no. 0071-2021-0004.
The work was supported by the Russian Science Foundation,
project no. 19-13-00340-П.