Question

Question 6:
low
The polymer having very
coefficient of friction is​

Answer 1

Answer:

The Coefficient of Friction

Coefficient of friction can be defined as the ratio of the force of friction between two bodies and the force pressing them together [26]. Kumar et al. [27] studied the influence of particle size, reinforcement content, load and speed on the coefficient of friction at constant load and speed. They observed that the coefficient of friction decreased with an increase in FA content at a constant load and speed. The coefficient of friction of composite materials was greater than that of the aluminum alloy. The coefficient of friction also increased with an increase in FA particle size. The rise in the abrasive resistance by coarse particles most likely explained the increase in coefficient of friction and therefore decreased the wear volume. They observed for a constant FA particle size and percentage of FA, a rise in load and speed decreased the coefficient of friction. Rao and Das [19] investigated the influence of SiC content and sliding speed on wear performance of aluminum composites. They observed that the coefficient of friction increased with increasing of SiC content, but decreased with rising sliding speed. In summary, the coefficient of friction decreased with an increase in the percentage of FA, load, and speed and increased with an increase in particle size.

Answer 2

The polymer having a very low coefficient of friction is​ Teflon.

• Most polymers have coefficients of friction in the range of 0.2 to 0.6 but fluorocarbons generally have lower coefficients of friction than this range.
• PTFE is known to have the lowest coefficient of friction, which is of the order of 0.05 that is obtained at high loads, low speeds, and moderate temperatures.
• PTFE (polytetrafluoroethylene) is a soft, low-friction fluoropolymer with outstanding chemical resistance and weathering resistance.
• The coefficient of friction for Teflon typically ranges between 0.05 and 0.20, depending on the load, sliding speed, and particular grade of Teflon finish used. The static and dynamic coefficients of friction for Teflon are also nearly equal.
• The main function and reason why Teflon was born are to reduce the friction coefficient, providing anti-adherence to the substrate to which it is applied.

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