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PTFE Performance

Release time:

2023-09-25 14:46

Weather resistance

Polytetrafluoroethylene has extremely high chemical corrosion resistance, such as in concentrated sulfuric acid, nitric acid, hydrochloric acid, and even boiled in aqua regia, its weight and performance are unchanged, and it is almost insoluble in most solvents. Slightly soluble in all alkanes (about 0.1g/100g) above 300°C. PTFE does not absorb moisture, non-flammable, oxygen, ultraviolet are extremely stable, so it has excellent weather resistance.

It is worth noting that PTFE cannot withstand a very strong reducing atmosphere

Molten alkali metal, ammonia alkali solution (alkali metal dissolved in liquid ammonia), some fluoride (such as TFA), naphthalene sodium salt, etc. can quickly corrode PTFE products

electrical properties

PTFE has low dielectric constant and dielectric loss over a wide frequency range, and high breakdown voltage, volume resistivity and arc resistance.

Radiation resistance

The radiation resistance of PTFE is poor (104 rad), and the degradation caused by high-energy radiation, the electrical and mechanical properties of the polymer are significantly reduced.

Aggregation

Polytetrafluoroethylene is produced by radical polymerization of tetrafluoroethylene. Industrial polymerization is carried out with stirring in the presence of a large amount of water to disperse the heat of reaction and to facilitate temperature control. The polymerization is generally carried out at a temperature of 40 to 80 ° C. under a pressure of 3 to 26 kgf/cm2, and an inorganic persulfate, an organic peroxide, or a redox initiating system can be used as an initiator. The exotherm was 171.38kJ per mole of tetrafluoroethylene polymerized. The dispersion polymerization requires addition of a perfluoro-type surfactant such as perfluorooctanoic acid or a salt thereof.

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