Addition polymers are made via 3 steps: 1. Initiation breaking a bond evenly to yield 2 radicals – 2. Propagation radicals making new radicals – 3. Termination 2 radicals coming together to form a bond – R–R R˙ + R˙ → 2. Condensation Polymers several monomers undergo condensation reactions in to form polyesters or ⇒ polyamides (aka polypeptides) Examples: hydroxy carboxylic acids homo-polymer that’s a polyester • ⇒ several HO–CH2–CH2–COOH → –[–O–CH2–CH2–C(O)–O–CH2–CH2–C(O)–]– amino carboxylic acids homo-polymer that’s a polyamide (aka polypeptide • ⇒ several NH2–CH2–CH2–CH2–COOH → –[–NH–CH2–CH2–CH2–C(O)–NH–CH2–CH2–CH2–C(O)–]– dicarboxylic acids co-polymer that’s a polyester and • ⇒ several HO–CH2–CH2–OH several HOOC–CH2–COOH and → –[–O–CH2–CH2–O–C(O)–CH2–C(O)–O–CH2–CH2–O–C(O)–CH2–C(O)–]– diamines dicarboxylic acids co-polymer that’s a polyamide and • ⇒ several NH2–CH2–CH2–NH2 several HOOC–CH2–COOH and → –[–NH–CH2–CH2–NH–C(O)–CH2–C(O)–NH–CH2–CH2–NH–C(O)–CH2–C(O)–]–
Addition polymers are made via 3 steps: 1. Initiation – breaking a bond evenly to yield 2 radicals 2. Propagation – radicals making new radicals 3. Termination – 2 radicals coming together to form a bond R˙ + R˙ → R–R 2. Condensation Polymers ⇒ several monomers undergo condensation reactions in to form polyesters or polyamides (aka polypeptides) Examples: • hydroxy carboxylic acids ⇒ homo-polymer that’s a polyester several HO–CH2–CH2–COOH → –[–O–CH2–CH2–C(O)–O–CH2–CH2–C(O)–]– • amino carboxylic acids ⇒ homo-polymer that’s a polyamide (aka polypeptide several NH2–CH2–CH2–CH2–COOH → –[–NH–CH2–CH2–CH2–C(O)–NH–CH2–CH2–CH2–C(O)–]– • and dicarboxylic acids ⇒ co-polymer that’s a polyester several HO–CH2–CH2–OH and several HOOC–CH2–COOH → –[–O–CH2–CH2–O–C(O)–CH2–C(O)–O–CH2–CH2–O–C(O)–CH2–C(O)–]– • diamines and dicarboxylic acids ⇒ co-polymer that’s a polyamide several NH2–CH2–CH2–NH2 and several HOOC–CH2–COOH → –[–NH–CH2–CH2–NH–C(O)–CH2–C(O)–NH–CH2–CH2–NH–C(O)–CH2–C(O)–]–
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