Preparation of novel hydrophobic magnetic Fe₃O₄/waterborne polyurethane nanocomposites

Abstract

Magnetic Fe3O4/waterborne polyurethane nanocomposites were synthesized based on waterborne polyurethane (WPU) and amino‐functionalized Fe3O4 by in situ polymerization. The Fe3O4 nanoparticle was found to be uniformly distributed in Fe3O4/WPU nanocomposites with linear or crosslinked structure. In addition, the formation mechanism and magnetic conduction mechanism of stable inorganic–organic nanocomposites were discussed. The experimental results showed that the thermal stability, magnetic, and mechanical properties of magnetic Fe3O4/waterborne polyurethane nanocomposites were improved by amino functionalized Fe3O4. Furthermore, the defoaming property of the emulsion and the hydrophobic property of magnetic Fe3O4/waterborne polyurethane nanocomposites were improved by the 1‐hexadecanol‐terminated prepolymer. What more, polycaprolactone (PCL)‐based Fe3O4/WPU nanocomposites have excellent mechanical properties (The tensile strength is over 30 MPa, the elongation rate is above 300%.) and magnetic properties. Magnetic Fe3O4/waterborne polyurethane nanocomposites will be used in the field of hydrophobic and microwave absorbent materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48546.

Study and Characterization of Fe3O4-PEG Nanoparticles Using The Co-Precipitation Method For The Production of Permanent Magnets

“…Figure 5 depicts the hysteresis of nanoparticles Fe 3 O 4 -PEG. According to [8], the hysteresis curve has experienced the particle effect. Particles also tend to affect the magnitude of the curvature of hysteresis in accordance with [9], even for all particle sizes above 40 nm in the presence of permanent magnetic magnets.…”