Classes of Polymers Addition,or chain-growth,polymers repeating unit H CI C- HHHH vinylchloride poly(vinyl chloride) Condensation,or step-growth,polymers dimethyl terephthalate ethylene glycol o o-o-om repeating unit Dacron°polyester Chapter 26 3Chapter 26 3 Classes of Polymers • Addition, or chain-growth, polymers • Condensation, or step-growth, polymers =>