Fe_3O_4 Nanoparticles Decorated Multi-Walled Carbon Nanotube/Hyperbranched Polyurethane Nanocomposites as Shape Memory Materials

摘要

Fe_3O_4 nanoparticles decorated multi-walled carbon nanotube (Fe_3O_4-MWCNT)/hyperbranched polyurethane nanocomposites were prepared by in-situ polymerization technique. The Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy and transmission electron microscopic study confirmed the decoration of Fe_3O_4 nanoparticles on the surface of the multi-walled carbon nanotube. The mechanical properties such as tensile strength (6.5-30.5 MPa) and scratch hardness (3-7.2 kg) were found to be enhanced with the increase of content of Fe_3O_4-MWCNT in the nanocomposites. The thermo-gravimetric analysis showed the increment of thermal stability (240-284 ℃) of the nanocomposites. The hyperbranched polyurethane and the nanocomposites exhibited good shape fixity. The nanocomposites showed good shape recovery under the application of microwave energy. The shape recovery speed increased with the increase of concentration of Fe_3O_4-MWCNT in the nanocomposites. Thus the studied nanocomposites might be utilized as advanced shape memory materials in different potential applications.