Polymerization is the process that occurs in a liquid such as ethylene when it is heated to 200°C and pressure of 2000At. The process starts with an oxygen molecule "bumping" into a carbon molecule and distrupting part of a carbon carbon link. This disruption propagates through the system, resulting in chains of carbon molecules being linked together. When the substance is cooled, the chains ensure a solid substance that we call plastic. This page of graphics is devoted to representing this process.
Ethylene
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Carbon Covalent bonding chains and circles
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