27-1 Chain-Growth Polymers Chain-growth polymers are produced by chain-reaction polymerization Benzoyl peroxide is used as common radical initiator Initiator (radical,acid,or anion)adds to a carbon- carbon double bond of an unsaturated substrate (a vinyl monomer)to yield a reactive intermediate that reacts with a second molecule of monomer and so on 2C02 Benzoyl peroxide Benzoyloxy Phenyl radical radical(Ph) Repeat Ph-CH2CH2. many times → Ph-(CH2CH2)nCH2CH2.Chain-growth polymers are produced by chain-reaction polymerization ▪ Benzoyl peroxide is used as common radical initiator ▪ Initiator (radical, acid, or anion) adds to a carbon– carbon double bond of an unsaturated substrate (a vinyl monomer) to yield a reactive intermediate that reacts with a second molecule of monomer and so on 27-1 Chain-Growth Polymers