Pure cellulose sheets (165 μm; Southworth Resume Paper, 100% cotton) were used as a stationary material, which were laid on the nonmagnetic metal platform of the friction tester. A new sheet was used for each of the polymers, except for consecutive sliding experiments. Flat polymer sheets (5 cm × 5 cm) with a thickness of less than 500 μm [PVC, PTFE, polyvinylidene difluoride, polypropylene (charging negatively against cellulose), polycarbonate, PMMA, PSU, polyimide-Kapton, and polyester polyethylene glycol (charging positively against cellulose)] were attached to the bottom of a flat, 2-mm-thick, 0.6-g insulating wood piece, and polymer-wood assemblies were presented as sliding objects.

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