Polytetrafluoroethylene microporous membrane, referred to as PTFE microporous membrane, is a perfluorinated polymer obtained by polymerizing the monomer tetrafluoroethylene.
In its molecular structure, the carbon atom is surrounded by 4 fluorine atoms. Since the covalent radius of the fluorine atom (0.064nm) is larger than the radius of the hydrogen atom (0.028nm), the fluorine atoms can be arranged to surround the carbon chain. , and because fluorine atoms repel each other, the entire macromolecular chain does not have a zigzag shape like a hydrocarbon molecular chain, but has a spiral structure similar to the human DNA helix. Outside the carbon chain skeleton of PTFE that is susceptible to chemical attack, a A tight, completely “fluorinated” protective layer protects the PTFE main chain from attack by any external reagents, giving PTFE incomparable solvent resistance, chemical stability and low cohesive energy density that other materials cannot match.
This helical structure determines the chemical resistance of PTFE.
PTFE microporous membrane is a fluorocarbon chemical with excellent chemical resistance and high and low temperature resistance. It will not deteriorate even when exposed to air and can be used for a long time in the range of -200~250℃.
Due to the influence of the electron-withdrawing groups of fluorine atoms contained in the molecular structure, the PTFE microporous membrane exhibits a high degree of chemical stability, is almost resistant to the intrusion of all acids and alkalis and other chemical substances, has outstanding non-stickiness, abnormal lubricity and excellent Electrical insulation properties, aging resistance and radiation resistance, minimal water absorption and other characteristics.
Widely used in petrochemical, machinery, electronics, electrical appliances, construction, textile and many other fields.
Because of these characteristics, it was secretly used in the military industry as soon as it appeared, and it was not made public until the 1950s.
</p
