Magnetic Field Activation of Thermoresponsive Shape-Memory Polymer with Embedded Micron Sized Ni Powder

Abstract

The shape memory polymer (SMP) materials are able to change these shape in response to external stimulus such as stress, temperature, solvent, PH, magnetic, electricity or light. The above-mentioned methods are only to recover initial shape of the deformed SMP, could not give the SMP predeformation. In this paper, magnetic field gives the shape memory polymer composite (SMPC) pre-deformation was studied, through on and off of magnetic field the two-way activation of SMPC was achieved. Shape memory effect of shape memory composite in magnetic field was studied. The SMPC was filled by nickel powder, and the nickel powder was treated by silane coupling agent. The Tg of shape memory composite was measured by dynamic mechanical analyzer. The surface element of treated nickel powder was analysized with XPS. The results indicated that the shape of composite filled by untreated nickel powder did not change in the magnetic field, while the composite filled by treated nickel powder was drawn in the magnetic field. The tensile stretch was decrease with the increase of nickel powder content in the shape memory composite. The addition of silane coupling agent onto nickel powder surface was helpful for the dispersion of nickel in polymer.

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

“…This shape memory process can operate under applied force and exposure to external stimuli. Currently, many types of stimuli are being used to stimulate shape memory behaviors, including temperature, 43 pH, 44 light, 45 infrared, 46 water or solvent, 47,48 and electric and magnetic fields 49–51 …”

“…Currently, many types of stimuli are being used to stimulate shape memory behaviors, including temperature, 43 pH, 44 light, 45 infrared, 46 water or solvent, 47,48 and electric and magnetic fields. [49][50][51] Molecular architecture or molecular deformation mechanism, is another essential factor in achieving shape memory behavior. 52,53 The molecular architecture of SMEs must consist of net-points (the hard phase or fixed phase) and switching units (the soft phase or reversible phase), which allow the structure to be deformed, maintained, and recovered under applied force and external activation.…”

Review of Thermoresponsive Electroactive and Magnetoactive Shape Memory Polymer Nanocomposites

“…Examples of materials with these and other fillers can be found in a recent review written by van Vilsteren, Yarmand, and Ghodrat . Even though some SMCs contain nickel-based magnetic nanoparticles, − no reference was found where these particles were used for the magnetic heating of the smart composites, with the exception of NiZn ferrite nanoparticles. For instance, Buckley et al used 10 vol % NiZn ferrite nanoparticles dispersed in their SMP and achieved a temperature increase of 11 °C after 40 s in a 545 A m –1 magnetic field at 12.2 MHz .…”

Shape memory CTBN/epoxy resin/cyanate ester ternary resin and their carbon fiber reinforced composites

“…Shape memory polymers (SMPs) are smart materials that can memorize the temporary shape and recovery to their original shape with external stimulus, such as heat, light, electric or magnetic field, pH, and specific solvent . SMPs exhibited advantages of lightweight, large recovery ability, and low cost compared with shape memory alloys (SMAs) and shape memory ceramics (SMCs), which has widely application prospect in actuators, sensors, biomedical stents, aerospace field .…”