Magnetic properties of a soft magnetic elastomer based on antioxidant magnetic composite particles and a water-soluble polymer matrix.

A soft magnetic elastomer, called a magnetorheological elastomer (MRE), based on a polyacrylamide (PAM) modified carbonyl iron particle (P-CIP) composite and a water-soluble PAM matrix was designed and prepared by the chemical polymerization and crosslinking method. P-CIPs were synthesized by the polymerization of an acrylamide monomer on the CIP surface to improve the oxidation resistance of CIPs and the interaction between the particles and polymer matrix in the MRE. The results obtained from infrared spectroscopy, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) (in a nitrogen atmosphere) show that the coating effect of the polymer on the particle surface is very good.