The influence of structural characteristics of ultra high molecular weight polyethylene on the properties of the composition | Mekhanika | kompozitsionnykh | materialov i konstruktsii
> Volume 23 > №2 / 2017 / Pages: 183-197

The influence of structural characteristics of ultra high molecular weight polyethylene on the properties of the composition

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Abstract:

With the development of the polymeric construction materials of tribotechnical designation, including ones on the basis of ultra high molecular weight polyethylene (UHMWPE) it is repeatedly shown that the wear resistance, as a rule, occurs above in the case of compositions with the larger degree of crystallinity. It is experimentally established that the degree of the crystallinity of polymeric matrix practically does not influence the deformation-strength characteristics of the corresponding compositions. For explaining the effect of an increase in the wear resistance under the conditions of tribotechnical loading in the work is simulated the per molecular structure UHMWPE. Is evaluated the influence of the degree of crystallinity on the stress-strained state of material at an appropriate scale. It is shown that an increase in the degree of crystallinity leads to an improvement in the strength properties of matrix, especially under the heating conditions, typical for the tribotechnical units. Crystallite structures play the role of stressed frame under the effect of load, and an increase in the temperature leads to the more rapid degradation of the strength properties of the amorphous phase of matrix. By this it is possible to explain a change of the performance properties of the filled compositions in the conditions of tribotechnic. Results of modeling the composition filled with AlO particles of microns size with spherulitic structures is considered and compared with experimental data.

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