Polytetrafluoroethylene is a white crystalline polymer with excellent chemical stability and thermal stability. It can work at high temperatures below 250°C for a long time. It also has a low friction coefficient and excellent lubrication properties. Characteristics, its dynamic friction coefficient is only 0.04. Therefore, PTFE flat film has broad application prospects in the repair of lathes.
But at the same time, the polytetrafluoroethylene flat membrane also has a typical difficulty in sticking. This is due to the large binding energy of the C-C bond and the C-F bond in the polytetrafluoroethylene molecular chain, and the strong intramolecular bonding, which makes other molecules The binding force is weak.
The fluorine atoms in the material shield the carbon atoms, making it difficult for other active molecules to penetrate and combine.
So the surface of polytetrafluoroethylene sheet is a typical low-energy surface. Its surface tension is only 1.85×10-2N/m, which is also the smallest among known solid materials. The surface tension of metals is generally 1×10-1N/m. , so it is a typically difficult-to-stick material.
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