Development and Characterization of Field Structured Magnetic Composites.

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Polymer composites with ferromagnetic fillers are key for electrical and electronic devices.
• Fabricating anisotropic magnetic composites requires precise control over filler alignment.

Purpose of the Study:

• To develop a dual-cure prepolymer system for fabricating anisotropic magnetic composites.
• To validate a permanent magnet-based particle alignment system for magnetic composites.
• To integrate particle alignment with additive manufacturing for composite fabrication.

Main Methods:

• Modification of ultraviolet light (UV) curable prepolymer for dual UV and thermal curing.
• Utilizing a permanent magnet-based system for magnetic particle alignment in resins.
• Integrating the alignment setup with a material jetting 3D printer for in-situ curing.
• Characterization of filler loading, microstructure, magnetic properties, and monomer conversion.

Main Results:

• Successful polymerization of the dual-cure resin via UV and heat.
• Demonstrated magnetic particle alignment in both dual-cure acrylate and epoxy resins.
• Achieved in-situ curing of aligned composites using UV and thermal post-curing.
• Quantified anisotropic magnetic properties through vibrating sample magnetometry.

Conclusions:

• A novel methodology combining magnetic field-induced particle alignment and dual-cure resins was established.
• This approach enables the creation of anisotropic magnetic composites via polymer casting and additive manufacturing.
• The developed technique offers a pathway for advanced functional materials in electronic applications.