Dacron, Nylon-66 and Novolac are prepared by condensation polymerisation.
Teflon is an addition polymer. Monomer of teflon is tetrafluoroethene.
$\mathrm{nCF}_{2}=\mathrm{CF}_{2} \underset{\text { High pressure }}{\stackrel{\text { Catalyst }}{\longrightarrow}}{ }_{\mathrm{CCF}_{2}-\mathrm{CF}_{2} \mathrm{t}_{n}}{\text { Teflon }}$
Tetrafluoroethene