ACB-Ni/EP51 composites were prepared by using direct-write 3D printer with ink that was blended from epoxy resin(EP51)as the matrix,acetylene black(ACB)and nickel powder(Ni)as fillers,and polyether polyol(PPG)as toughening agent.Rheological properties and printability of ink were characterized by rheometer and direct-write 3D printer,mechanical properties,microscopic morphology,thermal properties,and shape memory proper-ties of the material were characterized by universal tensile testing machine(UTM),scanning electron microscope(SEM),dynamic thermomechanical analyzer(DMA),and differential scanning calorimeter(DSC).The effects of fillers on properties of the ink and material were investigated.The results show that the ink can be printed well when the ACB content reaches 12wt％.Clogging of the printer nozzle causes discontinuous and uneven printing when Ni content reaches 16wt％.The toughened structure of the"island"formed after solidification significantly improves the tensile strength of the material(above 60 MPa).As Ni content increases,the effect of Ni on tensile strength changes from promoting to weakening.The shape fixation rate(Rf)decreases from 99.4％to 94.2％when Ni content increases 6wt％increases to 14wt％.Under the action of a 300 kHz alternating magnetic field,the shape recovery occurs,and an increase in Ni content results in higher shape recovery rate(Rr)and recovery rate,Rr increases from 94.8％to 99.1％,and the recovery time shortens from 39 s to 17 s.The ACB-Ni/EP51 composites exhibits excellent shape memory performance and has promising application prospects in areas such as deployable structures in space,actuators,and 4D printing.
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