The friction noise value of the TPU modified with 3% PTFE also had an increasing trend, which conformed to the high COF during this period (see Figure 4 a).
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Reinforcement of Frictional Vibration Noise Reduction Properties of a Polymer Material by PTFE Particles.
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The sentences
The friction noise value of the TPU modified with 9% PTFE particles still exhibited a decreasing trend due to the decreasing trend of the COF shown in Figure 4 a.