Fluoropolymers

Views: 0 Author: Site Editor Publish Time: 2020-08-10 Origin: Site

Outstanding properties of fluorocarbon polymers(or fluoroplastics) include inertness to most chemicals and resistance to high temperatures. Fluoro plastics have a rather waxy feel, extremely low coefficients of friction, and excellent dielectric properties that are relatively insensitive to temperature and power frequencey.

PTFE-polyterafluoroethylene is a synthetic fluoropolymer of tetrafluoroethylene taht finds numerous applications. PTFE is a fluorocarbon solid, as it is a high-molecular-weight compound consisting wholly of carbon and fluorine. PTFE is hydrophobic, and has one of the lowest coefficients of friction against any solid.

(1) Properties PTFE is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2.2g/cm. Its melting point is 327C, but its mechanical properties degrade above 260C. PTFE gains its properties from the aggregate effect of carbon-fluorine bonds, as do all fluorocarbons. PTFE's coefficient of friction is 0.05 to 0.10, which is the third-lowest of any known solid material.

PTFE has excellent dielectric properties. This is especially true at high radio frequencies. making it suitable for use as an insulator in cables and connector assemblies. Combined with its high melting temperature, this makes it the material of choice as a high-performance substitute.

Because of its chemical inertness, PTFE cannot be cross-linked like an elastomer. Therefore it has"memory"and is subject to creep. This is advantageous when used as a seal, because the material creeps a small amount to conform to the mating surface. However, to keep the seal from creeping too much, fillers are used, which can also improve wear resistance and reduce friction. Sometimes, metal springs apply continuous force to PTFE seals to give good contact, while permitting a beneficially low percentage of creep.

(2)Applications PTFE is extremely heat-resistant, it is used as a non-stick coating for pans and other cookware as it is hydrophobic and possesses fairly high heat resistance. It is very non-reactive, partly because of the strength of carbon-fluorine bonds, and so it is often used in containers and pipework for reactive and corrosive chemicals. Where used as a lubricant, PTFE reduces friction, wear, and energy consumption of machinery.

Its coefficient of friction is lower than that of any other plastic, and it can be used unlubricated such as in plain bearings, gears. In these applications, it performs significantly better than nylon and acetal; it is comparable to ultra-high-molecular-weight polyethylene(UHMWPE), although UHMWPE is more resistant to wear than PTFE. For these applications, versions of PTFE with mineral oil or molybdenum disulfide embedded as additional lubricants in its matrix are being manufactured.

PTFE has outstanding chemical resistance, being inert to most chemicals. High corrosion resistance favors the use of PTFE in laboratory environments as containers, as magnetic stirrer coatings, and as tubing for highly corrosive chemicals such as hydrofluoric acid, which will dissolve glass containers.

Fluoropolymers

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