How does radical chemistry relate to the formation of Teflon from tetrafluoroethylene?

In the context of radical chemistry, the formation of polytetrafluoroethylene (Teflon) from tetrafluoroethylene is a classic example of a chain reaction. This process relies on the use of free-radical initiators, such as peroxides, to convert the gaseous monomer into a solid polymer.123

The reaction proceeds through three distinct stages:

• Initiation: The initiator decomposes to form highly reactive free-radical species, which contain an unpaired electron. These radicals react with the tetrafluoroethylene monomer to begin the chain.1
• Propagation: The radical species adds to the double bond of successive tetrafluoroethylene molecules, extending the carbon chain and maintaining the radical at the end of the growing chain.1
• Termination: The chain reaction concludes when the radical end of the polymer chain reacts with another radical species or is otherwise neutralized, resulting in the final stable polymer.1

This polymerization process creates a dense, chemically inert material characterized by strong carbon-fluorine bonds, which gives Teflon its signature nonstick and heat-resistant properties.23