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Figure 9: IR spectra of pure UHMWPE (1), implanted UHMWPE (2), UHMWPE-based nanocomposite (with 0.5 wt. % HA) (3), UHMWPE-based mictocomposite (with 20 wt. % HA) (4). Dose: N + 1 1 0 1 7 .