Synthesis and characterization of surface modified magnetorheological elastomers in high strain

Magnetorheological Elastomers (MREs) are viscoelastic composites of elastomeric matrices filled with magnetizable particles. Mechanical properties can be continuously and rapidly controlled by an applied magnetic field.; The long-term stability of magnetorheological elastomers is of prime concern. Thermal degradation and oxidation contribute to a decreased magnetorheological effect and material performance. The inclusion of large quantities of iron particles provides additional pathways for polymer degradation. Improved compositions of MREs are therefore developed to increase the stability of these composites. These advances include particle-modified systems such as organic coatings and emerging polymerization grafting techniques, combined with high-performance polymer matrices.; Investigation includes accelerated ageing techniques at elevated temperatures and pressures. Characterization includes scanning electron microscopy, energy-dispersive X-ray spectrometry, differential scanning calorimetry, oscillating disc rheometry and mechanical testing.; Novel formulations and modifications used in our MREs produce materials with superior retention of both mechanical and magnetorheological properties after accelerated ageing compared to conventional composites.