The thermodynamic effects and high chain segment mobility resulted in the hydrogen bonding whose interchain distance is a larger rupture or even chain scission. The transition in structure of the wear debris originated from the activation of the chain segments due to the thermodynamic effects. The proportion of α 2(002 + 202) planes increased and the reflection from the α 1(200) planes was suppressed in the wear debris, indicating a preferential arrangement of α 2(002 + 202) on the surface of the wear debris. The primary crystalline phase of both the unworn MC nylon 6 and the wear debris were α crystal, but the crystallinity of the latter was higher than that of the former. The structure and micromorphology of wear debris of MC nylon 6 under dry sliding were investigated by FTIR, XRD, DSC, and FESEM, and the 3D surface topographies of friction materials before and after the friction test were observed, which will be helpful in understanding the friction and wear processes.
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