EEUG composites based on Fe3+-O metal coordination bonds have been prepared by introducing FeCl3 into epoxidized Eucommia ulmoides gum(EEUG).The effects of Fe3+-O coordination bonds on the vulcanization,crystallization,mechanical and damping properties of EEUG were investigated.The results showed that Fe3+is complexed with the epoxy group,and the interaction decreases with increasing temperature.The presence of the co-ordination bond can inhibit the formation of the EEUG β-crystal form and decrease the crystallization capacity of the composite.The effect of coordination bonds on vulcanization of Eucommia ulmoides gum was mainly reflected in the induction period of vulcanization,the larger number of coordination bonds,and shorter scorch times.By acting as a"dynamic sacrifice bond",the mechanical strength of EEUG-29.8％composites is greatly improved.After adding 3 phr FeCl3,the tensile strength of EEUG-29.8％composites is increased from 2 MPa to 7 MPa.In addi-tion,the coordination crosslinking between Fe3+and epoxy groups can control the damping performance of the com-posite by limiting the movement of EEUG molecular chains.Compared with EEUG-29.8％composites,the damp-ing peak position of the composite after adding 3 phr FeCl3 moves from-25℃to 0℃.The effective damping tem-perature range increased from-40℃～-16℃to-23℃～19℃,which significantly improved the damping per-formance of EEUG composites at room temperature.
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