Antifrictional composites based on chemically modified UHMWPE. Part 2. The effect of nanofillers on the mechanical and triboengineering properties of chemically modified UHMWPE
Tóm tắt
The mechanical and tribological properties of nanocomposites based on chemically modified ultra-high molecular weight polyethylene are determined. The super-molecular and chemical structure of the nanocomposites based on the block copolymers UHMWPE-grafted UHMWPE and UHMWPE-grafted HDPE are studied by the methods of X-ray structural analysis, IR spectroscopy, scanning differential calorimetry, and electron microscopy. The mechanical and tribological properties of the nanocomposites based on the block copolymers are found to differ insignificantly from those of the nanocomposites on the base of non-modified UHMWPE. The crystallization and formation of super-molecular structure in the heterogeneous materials under study are shown to depend on the heterogeneity of the distribution of the nanofillers. The authors believe that chemical modification in terms of grafting polar monomers is unable to improve the adhesion of the nanofillers to the high-molecular matrix (UHMWPE). Thus, the wear resistance of the UHMWPE-based nanocomposites is mostly governed by the crystallization conditions and type of supermolecular structure formed during crystallization (either spherulitic or lamellar).
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