The C=C double bond in ethene is involved in the polymerisation reaction. It allows ethene molecules to join, so it is an example of an addition reaction>. Poly(ethene) is an addition polymer.

Addition polymers are made from molecules containing C=C bonds. Polymers have different properties and uses but it is difficult to dispose of them. DNA, starch and proteins are biological polymers.

Through the addition of agents to the lipid membrane ... use covalent chemistry for direct drug conjugation (e.g., linear polymers). The second group includes hydrophobic interactions between ...