Abstract
Polymeric smart foams are lightweight and multifunctional porous materials that are sensitive to the magnetic field due to the presence of magnetic particles embedded in the matrix. Recently, a constant magnetic field has been exploited to align the particles along the magnetic field lines during the formation of the porous structure. In this paper, a new field-structuring process was developed that makes use of a time-profiled magnetic field during the foaming process to control the geometrical features of the particles aggregates. The effects of magnetic field strength as well as the switch-on and switch-off times on the magnetoelastic behavior of the smart foams were investigated. It was proven that the alignment of the particles results in both a strong relative sensitivity to the magnetic field and a positive stress change, whose extent depends on the geometrical features of the developed aggregates.
Highlights
Smart foams are magnetoelastic (ME) materials that are sensitive to an external magnetic field and exhibit a fast and reversible change in the mechanical response [1]
From conventional high density magnetoelastic materials, whose use is foams exhibited a strong increase in the mechanical response along the magnetic field the use the magnetic fieldaduring the foaming process limitedIttowas lessconfirmed than a 5%that strain, the of smart foams show monotonic growing trendof up to a lines
Smart foams allowed usup to the field-structure the magnetic particles in linear aggregates along
Summary
Smart foams are magnetoelastic (ME) materials that are sensitive to an external magnetic field and exhibit a fast and reversible change in the mechanical response [1]. Among ME materials, those based on polymers—such as elastomers, gels, or foams—have the advantage of being moldable and scalable in performance. The sensitivity to the magnetic field is generally developed by adding magnetic particles in the polymer precursors during a preliminary mixing step. It is apparent that both mechanical and magnetomechanical responses, as well as the functional features (for instance EMI shielding, thermal, or electric conductivity), are dependent on the peculiar spatial distribution of the particles, which is set during the consolidation process of the polymer in a mold. Any effort in the improvement of this process phase may lead to significant results in the functional performances
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
