To make low-density polyethylene, you'll need to call on the radical polymerization process. This involves extreme heat (up to 570 degrees Kelvin) and an immense amount of pressure (up to 3,000 atm). First, the raw petroleum-based materials are broken down into small molecules, then the ethylene gas is separated and funneled into a reactor.
In the reactor, it'll come into contact with an initiator like oxygen or organic peroxide. Then, the polymerization will begin.
The image beneath shows how polyethylene and ethylene molecules and their chemical formulas look visually.
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