Preparation of modified α-zirconium phosphate/ultra high molecular weight polyethylene composites and their friction and wear properties
Ultra high molecular weight polyethylene(PE-UHMW)is a self-lubricating polymer material with excellent mechanical properties,but it is poorly resistant to abrasive particle wear and has a large wear rate.The filling of modified two-dimensional α-zirconium phosphate(α-ZrP)was used with a view to improve the friction and wear properties of PE-UHMW composites.The α-ZrP was first intercalated and stripped using tris(hydroxymethyl)aminomethane,and then modified by surface grafting modification with vinyltriethoxysilane to improve the interfacial interactions between the α-ZrP and the PE-UHMW matrix.The structures of α-ZrP before and after modification were characterized,which indicated that the surface grafting modification of the α-ZrP was successfully carried out and the modified α-ZrP(G-ZrP)was prepared.The friction and wear properties of G-ZrP/PE-UHMW composites with different G-ZrP contents were tested.The results show that an anchored bond structure is formed between G-ZrP and the PE-UHMW matrix.When the mass fraction of G-ZrP is 2%,the friction coefficient and wear rate of G-ZrP/PE-UHMW composite samples are 0.172 0 and 3.594×10-6 mm3/(N·m)respectively,which are about 9.0%and 47.1%lower than those of pure PE-UHMW samples.The depth of the wear track is about 2 μm and the wear track is the shallowest,which is about 75%lower than that of the pure PE-UHMW samples(the depth of the wear track is about 8 μm).In the friction process of the composite,the accumulation of G-ZrP on the friction surface produces a good self-lubricating interlayer effect,which helps to reduce the direct contact between the friction pairs,and also reduces the friction coefficient through interlayer sliding.At the same time,the hydrogen bonding between the molecular chains of surface vinyltriethoxysilane and the anchored bonding structure with the molecular chains of PE-UHMW contribute to the load conversion during the sliding friction process,which also reduces the deformation and tearing of the friction surface of the composite,reduces the wear amount of the composite,and effectively improves the friction and wear properties of PE-UHMW.
ultra high molecular weight polyethylenezirconium phosphatefriction coefficientwear ratecomposite
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