| A new generation of magnetorheological materials is based on polymer gels. Under a magnetic field, magnetorheological fluids exhibit a change in rheology from a liquid to a semi-solid state. Polymer gels are characterized for the purpose of utilization in similar materials: magnetorheological polymer gels (MRPG). The base polymer material has a rheology that may be chosen by precise selection of the components used in its formation. By changing the composition, silicones and polyurethanes are demonstrated to have behavior of liquid, gel, or solid depending on the degree of crosslinking and dilution. Mechanical properties of the silicone-based MRPG are investigated. The compressive yield for a specific case is found. Kinetic properties of polyether polyol/p-MDI polyurethane are investigated by DSC. Order of reaction, heats of reaction, activation energy, and the pre-exponential rate constant are found for this system with no dilution and with a 7.5% plastisizer dilution. |
