History and Production - PTFE was accidentally discovered in 1938 by Roy J. Plunkett while working for DuPont. - Kinetic Chemicals patented the new fluorinated plastic in 1941 and registered the Teflon trademark in 1945. - DuPont started producing over 2,000,000 pounds of Teflon per year in 1948. - PTFE was used in the Manhattan Project to coat valves and seals. - Non-stick cookware was created in 1954 by Marc Grégoire and Marion A. Trozzolo. - PTFE is produced by free-radical polymerization of tetrafluoroethylene. - Special apparatus is required to prevent explosive decomposition of tetrafluoroethylene. - Granular PTFE is produced via suspension polymerization or emulsion polymerization. - Toxic surfactants like PFOA and PFOS were previously used, but alternative surfactants are now being used. - The production process involves hydrolyzing sulfate ester groups to give OH end-groups.

Properties - PTFE is a white solid with a density of about 2200kg/m and a melting point of 600K. - It maintains high strength, toughness, and self-lubrication at low temperatures. - PTFE gains its properties from carbon-fluorine bonds. - Highly reactive metals and fluorinating agents can affect these bonds. - PTFE undergoes depolymerization at temperatures above 650–700°C.

Applications - PTFE is used as a non-stick coating for pans and other cookware. - It is used in containers and pipework for reactive and corrosive chemicals. - PTFE reduces friction, wear, and energy consumption in machinery. - It is used as a graft material in surgery and as a coating on catheters. - PTFE is widely applied in various industries and products.

Environmental Impact - PTFE is a PFAS and a persistent organic pollutant. - The environmental impact and toxicity to human and mammalian life have been studied since the 21st century. - DuPont used PFOA during PTFE production, leading to legal actions and discontinuation of its use. - Chemours now manufactures PTFE using an alternative chemical called GenX. - PFAS, including PTFE, have raised concerns due to their persistence and potential health effects.

Additional Applications - PTFE is commonly used for wire insulation in aerospace and computer applications due to its excellent dielectric properties. - PTFE is used for plain bearings, gears, seals, gaskets, and other applications with sliding action of parts. - PTFE is an ideal material for fabricating long-life electrets, which are electrostatic analogues of permanent magnets. - PTFE film is widely used in the production of carbon fiber composites and fiberglass composites in the aerospace industry. - PTFE is commonly used as a chemically inert liner in hose assemblies, expansion joints, and industrial pipelines.