Classes of Polymers Addition,or chain-growth,polymers epeating unit H CI a.a vinyl chloride poly(vinyl chloride) Copyright 2005 Pearson Prentice Hall,Inc Condensation,or step-growth,polymers eHo-8-○&-+o-Gual-0m heat,loss of CHOH -OCH catalyst dimethyl terephthalate ethylene glycol 110-10 -CH,CH2O-- poly(ethylene terephthalate)or PET,also called Dacron polyester or Mylar film => Copyright 2005 Pearson Prentice Hall,Inc.Chapter 26 3 Classes of Polymers • Addition, or chain-growth, polymers • Condensation, or step-growth, polymers =>