84 I. Polymers are large molecules made by forming chemical bonds among a group of smaller chemical units.
Natural rubber is also a polymer of a molecule known as isoprene.
Two of the more common general methods for polymer formation are addition and condensation . The addition polymers require the reactivity of double or triple bonds and a free radical catalyst. Note, please do not try the movies in the studio classroom . Note, we have usually talked about electrons in pairs in bonding, a single electron is a highly reactive species called a free radical . Your text describes the addition polymer chemical reactions on pp.