Functional composite material design using Hansen solubility parameters

Abstract

Functional composite materials have been applied in various fields, such as conductivity, magnetism, heat conduction, and as structural materials. Many functional composite materials exhibit an improved performance by surface treatment of the filler. To theoretically consider this composite material design, we introduced Hansen solubility parameters (HSPs) to the evaluation of surface treatment agents. In this paper, in a bonded magnet composed of resin and magnet powder, the HSP of magnet powder treated with a silane coupling agent was evaluated by both calculation and measurement to confirm the effectiveness of the HSP. As a result, a correlation was found between the calculated HSP of the silane coupling agent and the fluidity of the bonded magnet. A strong correlation was also observed between the HSP and the fluidity of the silane coupling agent-treated magnet powder. From the above, the applicability of the HSP to composite material design is shown to be enhanced.