| On the basis of surveying of the relative literature about the modification of ultra-high molecular weight polyethylene (UHMWPE), good heat-resistant UHMWPE composites were made by filling and cross-link, whose friction coefficient and wear loss were decreased and can be used into more fields.Fillers were treated by couplings and the UHMWPE composites mechanical properties were studied, which showed that silane and macromolecule couplings could modify the interfacial adherence of the fillers and UHMWPE and that composites dealt by compound couplings have more optimized mechanical properties than by single couplings.In this paper, UHMWPE composites modified by fillers of tiny glass bead, kaolin and Quardrupedal Crystal Whisker of Zinc Oxide were systematically studied, the tensile yield strength, heat deformation temperature (HDT), friction coefficient and wear loss were measured, and the surfaces after wear were observed by SEM through which the mechanism for friction and wear was analyzed. Then UHMWPE composites co-filled by glass bead/ZnO and kaolin/ZnO were studied, which showed that the co-filling had obvious synergetic effect and that composites by 6%ZnO and 3% kaolin had optimized properties for friction and wear. SEM proved the existence of synergetic effect in the case of coexistence and co-restriction of grind wear and fatigue wear.In the system of cross-linked UHMWPE by DCP, dispersal by solvent acetone and low DCP contents were adopted. Investigations by gel ratio and crystalline degree showed that these scheme had good effect on the cross-link of UHMWPE and that better properties had been gained when DCP contents was 0.2~0.4% by suitable increase of molecular inter-action. However, when cross-link and filling were used together, the synergetic effect was faint because of the crosslink function was restricted within small action field, the system by cross-link and filling together had no especially optimized results which was close to filling only.
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