Polymeric composite materials based on UHMWPE filled with modified montmorillonite

Results of the studies of the effect of montmorillonite modified with organics (oMMT) grade 101/102, on the mechanical, tribological and thermodynamic characteristics of ultrahigh molecular weight polyethylene UHMWPE are reported. The filler was introduced into the polymeric matrix in the amount of 0,5, 1 and 2 mass %. The samples for tests were obtained by hot pressing. It was established that the introduction of 0,5 mass % oMMT into ultrahigh molecular weight polyethylene causes an increase in the tensile strength by 23 %, and elastic modulus by 14 % in comparison with the non-filled polymer. It is shown that the rate of mass wear of the material under dry sliding friction decreases by a factor of 1,5, while the linear wear decreases by a factor of 2,8 in comparison with the initial ultrahigh molecular weight polyethylene. Differential scanning calorimetry was used to reveal that the enthalpy of melting and the degree of crystallinity decrease by 4 % with an increase in the fill content in the polymeric matrix. It was shown by means of structural studies that the introduction of organic clay into the polyethylene promotes the formation of the spherulite structure of the composites, with filler particles acting as crystallization centers. Materials with this kind of structure are characterized by increased strength and wear resistance in comparison with the initial polymer.

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