Historically polymers have been divided into two broad classes: conden sation polymers and addition polymers [11, 14, 15]. Flory [11, p. 37] has defined these as follows: condensation polymers, in ...

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.