After completing this topic you should be able to : Condensation polymers are made from monomers with two functional groups per molecule. Draw the structure of a polyester polymer given the monomer structures, or the repeating unit / monomers given the polymer structure. Draw the structure of a polyamide polymer (nylon) given the monomer structures, or the repeating unit / monomers given the polymer structure. State starch is a natural condensation polymer made of many glucose molecules linked together. Understand the classifications mono-, di- and polysaccharides in relation to the terms monomer and polymer. State proteins are natural condensation polymers made of many amino molecules linked together. Draw the structure of a protein polymer given the amino acids (monomers) structures.

In the topic on e ee esters you learned that molecules can join by a c cc condensation reaction. alcohol carboxylic acid + ester + water propanol ethanoic acid + propyl ethanoate + water + + water molecule eliminated ester link (carboxylate group) + + CH3CH2CH2OH + HOOCCH3 CH3CH2CH2OOCCH3 + H2O

In making an e ee ester the c cc condensation r rr reaction involves the h hh hydroxyl g gg group of the alcohol reacting with the c cc carboxyl g gg group of the c cc carboxylic acid. hydroxyl group carboxyl group + + ester link (carboxylate group) water molecule molecules join DIALCOHOL DICARBOXYLIC ACID

H2O molecule forms H2O molecule forms H2O molecule forms Ester link Ester linkEster link REPEATING UNIT

DIALCOHOL ethane-1,2-diol benzene-1,4-dicaboxylic acid (other name: terephthalic acid) n REPEATING UNIT H2O H2O H2O

DIAMINE

REPEATING UNIT H2O molecule forms H2O molecule forms H2O molecule forms Amide link Amide link Amide link The repeating unit consists of two monomers.

DIAMINE 1,6-diaminohexane hexane-1,6-dioic acid H2O H2O REPEATING UNIT n