Effect of Magnetic Orientation of Boron Nitride Modified with Magnetite on the Thermal Conductivity of Polyurethane-Based Organic-Inorganic Hybrids 


Vol. 56,  No. 5, pp. 321-326, Oct.  2019
10.12772/TSE.2019.56.321


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  Abstract

The organic–inorganic hybrids of polyurethane (PU) and boron nitride (BN) modified with magnetite (Fe3O4) were prepared to investigate the effect of BN orientation under a magnetic field for enhancing the thermal conductivity of PU. The introduction of magnetite could be proved through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). It was observed that the magnetite nanoparticles of 10−100 nm covered the BN surface. The thermal conductivity of the hybrids showed an increasing trend as the BN content increased. The hybrid containing 60 wt% of BN modified with magnetite without magnetic orientation exhibited a thermal conductivity that was 3.8 times higher than that of the neat PU. However, the same hybrid with a magnetic orientation exhibited thermal conductivity that was 10 times higher than that of the neat PU. Conclusively, the effect of the magnetite BN orientation under the magnetic field on the thermal conductivity was found to be very effective by forming a thermal path of BN platelet along the magnetic field direction in the hybrids.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)