A fully automated and computer-controlled friction tester (Hanatek Advanced Friction Tester) was used for the friction experiments to obtain friction versus distance data as well as static and dynamic friction coefficients with high accuracy. Polymer sheet-wood assemblies were attached directly to the load cell. Normal load was changed by putting round metal pieces (brass) with different weights at the top of the wooden support when necessary. The sliding speed was set to 1200 mm/min for all the experiments. Weights were grounded before the charge measurements. A homemade metal frame polymer chamber was used in the sliding experiments that were performed in air or under continuous flow of nitrogen and argon.

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