A significant proportion of clothing is made using polyster fibre. Polyster is also used to make plastic bottles for drinks. ployster is made by polymerising ethane-1,2-diol with benzene-1,4-dicarboxylic acid(terepthalic acid). As each ester link is made, a water molecule is lost - a condensation reation occurs. so the formation of a polyster is an example of condesation polymerisation.see in the figure(sry for not a clear image)