Abstract
The main goal of this project is to create a new generation of magnetically active polymeric materials (MPM) of the new generation, capable of changing in a controllable manner their physical properties under the influence of external magnetic fields. MPM are composites based on ferromagnetic particles dispersed in liquid (magnetic fluids) or elastomeric (magnetic elastomers) media. Under the action of an external magnetic field, the magnetic particles magnetize and begin to interact with each other by means of magnetic forces. The result of this interaction depends on the type of dispersion medium. In magnetic fluids, particles freely move and line up into so-called chain structures along magnetic field lines, which leads to the appearance of a yield point and a very fast (fractions of milliseconds) transition from a liquid to an almost solid state. In elastomeric media, particle motion is limited by the elasticity of the polymer matrix, and in this case, the resulting mesoscopic structures that form magnetic particles depend on the elastic modulus of the elastomer: the smaller the modulus, that is, the softer the matrix, the larger displacements of particles from the initial equilibrium position can be realized under the action of an external magnetic field. A change in the internal structure of an elastomeric material in a magnetic field leads to a whole series of new physical effects, in particular, to a significant increase in the elastic modulus of magnetoactive elastomers, to large deformations, etc. Due to their unique properties, magnetoactive materials are promising for a wide range of practical applications.
The project aims at (1) development of new polymeric dispersion media based on comb-like polymers with a high density of side chains (polymer brushes) and multiarm stars, whose properties can be regulated at the molecular level, this will allow to control the restructuring of the filler microstructure under the influence of an external magnetic field, and, consequently, the physical properties of the composite material, which depend on its microstructure and (2) the development of new theoretical approaches for describing the properties of magnetoactive polymeric materials.
The research conducted during the first stage of the project
The research conducted during the first stage of the project
The research conducted during the first stage of the project