Development and Characterization of Field Structured Magnetic Composites

Abstract

Polymer composites containing ferromagnetic fillers are promising for applications relating to electrical and electronic devices. In this research, the authors modified an ultraviolet light (UV) curable prepolymer to additionally cure upon heating and validated a permanent magnet-based particle alignment system toward fabricating anisotropic magnetic composites. The developed dual-cure acrylate-based resin, reinforced with ferromagnetic fillers, was first tested for its ability to polymerize through UV and heat. Then, the magnetic alignment setup was used to orient magnetic particles in the dual-cure acrylate-based resin and a heat curable epoxy resin system in a polymer casting approach. The alignment setup was subsequently integrated with a material jetting 3D printer, and the dual-cure resin was dispensed and cured in-situ using UV, followed by thermal post-curing. The resulting magnetic composites were tested for their filler loading, microstructural morphology, alignment of the easy axis of magnetization, and degree of monomer conversion. Magnetic characterization was conducted using a vibrating sample magnetometer along the in-plane and out-of-plane directions to study anisotropic properties. This research establishes a methodology to combine magnetic field induced particle alignment along with a dual-cure resin to create anisotropic magnetic composites through polymer casting and additive manufacturing.

High aspect ratio galfenol flakes for high strain efficiency and sensing performance of magnetostrictive polymer composites

“…Remanence-to-saturation magnetisation ratio, also termed squareness ratio, is used as a qualitative measure of magnetic anisotropy. 73,74 Per Fig. 7(e), this rapidly increases from the bulk value with increasing milling time, highlighting the anisotropic nature of the milled particulates.…”

Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium‐iron‐born bonded magnet

“…Bonded neodymium‐iron‐born (NdFeB) magnets are typically created by blending the magnetic powder with a polymer binder, followed by shaping via methods such as calendering, injection, extrusion, or compression molding 1–3 . These magnets can be readily tailored into desired forms, often requiring minimal or no subsequent processing 4 .…”

Magnetic Filler Polymer Composites—Morphology Characterization and Experimental and Stochastic Finite Element Analyses of Mechanical Properties

“…Additionally, compression molding has the potential to achieve higher magnetic density and mechanical properties by applying pressure. In this context, Balakrishnan et al [17] proposed a methodology to combine magnetic field-induced particle alignment along with a dual-cure resin to create anisotropic magnetic composites through polymer casting and AM. Kaustubh et al [18] studied the compression molding process for anisotropic NdFeB magnets in a polycarbonate matrix.…”