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12 Modern Materials Solutions to Exercises H n 12.78 n C CH₂ CH₂ C H + H N CH₂ CH₂ NH₂ o C CH₂ CH₂ NH CH₂ CH₂ NH + 2n H₂O 12.79 Analyze/Plan. Decide whether the given polymer is an addition or condensation polymer. Select the smallest repeat unit and deconstruct it into the monomer(s) with the specific functional group(s) that would form the stated polymer. Solve. (a) H H C = C H vinyl chloride (chloroethylene or chloroethene) (b) CH₂ CH₂ CH₂ NH₂ H₂N CH₂ CH₂ CH₂ + hexanediamine HO CH₂ CH₂ C CH₂ CH₂ OH adipic acid (c) o o CH₂ OH HO CH₂ + C HO OH ethylene glycol terephthalic acid 12.80 (a) By analogy to polyisoprene, Figure 12.42, H H n CH₂ CH C CH₂ C Cl H H H n (b) n CH₂ CH CH₂ CH CN CN n 12.81 Plan/Solve. When nylon polymers are made, H₂O is produced as the C-N bonds are formed. Reversing this process (adding H₂O across the C-N bond), we see that the monomers used to produce Nomex TM are: HOOC COOH NH₂ and 353