Composite film preparation and characterization of cantilevers, flowers, scrolls, and snappers

Magnetic SMP films were prepared through solvent casting of thermoplastic polyurethane polymers, 0.5 g of IROGRAN (Huntsman Corporation, PS 455-203) or 0.2 g of DiAPLEX (SMP Technologies, MM5520), dissolved in 5 ml of tetrahydrofuran (THF) and stirred for at least 2 hours to completely dissolve the polymer pellets. Unless stated otherwise, masses of 0.05 g (for IROGRAN) or 0.02 g (for DiAPLEX) of carbonyl iron microparticles with an average diameter of 4.2 μm (MMPs, Jilin Jien Nickel Industry, JCF2-2) obtained from LORD Corporation were then added to the polymer solution and mixed uniformly with a vortexer. These masses were chosen to give a loading of 9.1 wt %, which is close to that used in our recent work (28). The mixture was poured into a rectangular polytetrafluoroethylene (PTFE) mold (l = 7 cm, w = 2 cm) for cantilevers, scrolls, and snappers and a circular PTFE mold (d = 4.5 cm) for flowers. For samples with chained magnetic particles used in cantilevers, scrolls, and snappers, the mold was placed between the poles of a GMW 3472-70 electromagnet in a horizontal field of 150 Oe immediately after pouring the solution. After solvent casting, the vertical segments at the edges of the film that adhered to the sides of the PTFE mold during solvent casting were removed with scissors to obtain flat rectangular films. To further remove any residual THF in the films, the samples were annealed under ambient atmosphere. IROGRAN samples were annealed at 80°C for 10 min, and DiAPLEX samples were annealed at 120°C for 30 min. The thicknesses measured with a micrometer after allowing complete evaporation of the THF and annealing are 252 μm for the IROGRAN scrolls and snappers, 124 μm for the DiAPLEX cantilevers and scrolls, 142 μm for the DiAPLEX snappers, and 94 μm for the DiAPLEX flowers. The composite films were characterized by magnetometry [Quantum Design MPMS 3 superconducting quantum interference device (SQUID) vibrating sample magnetometer], scanning electron microscopy (FEI Verios 460L field-emission scanning electron microscope with a secondary electron detector with an accelerating voltage of 1 kV), optical absorbance spectroscopy (Ocean Optics CHEMUSB4-VIS-NIR spectrophotometer), thermomechanical testing (TA Instruments RSA III), and differential scanning calorimetry (DSC) (PerkinElmer Diamond DSC).

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