Properties Of PTFE

Polytetrafluoroethylene(PTFE)is in great demand, making it representative of fluorocarbon polymers. The chemical structure of PTFE has the hydrogen atoms of polyethylene completely displaced by fluorine atoms to form a high molecule. It's chemical structure is as follow

The shield of fluorine atoms renders the C-C chain immunity to chemical attack, and the extremely stable C-F bond is attacked only by highly aggressive agents, such as alkali metals or elemental fluorine
The extremely good electrical properties of PTFE arise from the rigid ultimately arranged CF2groups coupled with minimum electron mobility within the molecule.
The height degree of crystalline in PTFE results from the unbranched structure of the molecules
PTFE exhibits marked anti-adhesive properties and has a low coefficient of friction. since outwards directed residua valiancy activity is obstructed by the fluorine Layers.
PTFE has a unique combination of outstanding properties, including high and low temperature resistance, chemical inertness dielectric behavior,¡¡non-sticking and self-lubricating properties, and the lowest coefficient of friction of all solid materials. However, the mechanical properties of PTFE are not necessarily superior to those of other plastics. In particular, it suffers from its low resistance to wear and creep, and low hardness.
The greatest improvements realized by fillers to PTFE are in its mechanical properties. Most other properties and characteristics of the basic PTFE are remained. Practically any material that can withstand the sintering temperature of PTFE(360°C-380°C)can be used as a filler. Among the filler materials used are glass fiber, graphite, molybdenum disulfide metal, mullein oxides, carbon fiber, polyamide, etc.