| Magnetorheological elastomer is an important branch in magnetorheological materials.It holds both characteristics of magnetorheological materials and the excellence of elastomer.Meanwhile,it gets over the problems of sedimentation and stability in magnetorheological fluids.In recent years,magnetorheological elastomer has become a research forcus in magnetorheological materials.However,actual magnetorheological elastomer has low magnetorheological effect and has a long way to application.In this study,a new method was designed for preparing magnetorheological elastomer with better stability,anti-oxidization and magnetorheological effect.First,N-polyether ethanediamine triacetic acid(PED3A), which has a polyether group and a chelating group,was synthesized,and used to modify the surface characteristics of carbonyl iron(CI) particles and prepare composite magnetic particles.Then magnetorheological elastomer based polyurethane was prepared by the composite particles.The structure and properties of PED3A and composite particles are characterized by FT-IR,SEM,XRD,VSM,TG-DSC,GPC and contact angle testing.The results show that PED3A had been successfully synthesized;and composite particles were prepared with PED3A as the shell,CI particles as the core,possessing excellent soft magnetic properties,better anti-oxidization and good compatible with polyether.The anti-oxidization and magnetorheological effect of the magnetorheological elastomer were characterized by accelerate aging test,optics microscope analyses and dynamic performance testing.The results show that the magnetorheological elastomer based polyurethane has better anti-oxidization and high magnetorheological effect.The experimental investigation results in this stuty indicate that the composite particles,made by hydrophilic chelating surfacant modifying the surface of CI particles,have better compatible with polyether.The anti-oxidization and magnetorheological effect of the magnetorheological elastomer prepared by the composite particles has distinct advance. |
