Condensation Polymerisation When the monomers do not contain carbon to carbon double they cannot undergo an addition reaction. Instead when the small molecules combine to form a polymer, a small molecule, often water, is removed between the monomer molecules in a condensation reaction. i.e. H O O H H H HO OH 2H2O NOTE both ends of the monomers have to be reactive. Polyesters Like esters, polyesters are formed from alkanols (OH) and carboxylic acids (COOH). As both ends of the molecules have to be reactive polyesters are often formed from alkanols containing two OH groups – diols. – 1,2 - diol – The carboxylic acids also contain two COOH groups dicarboxylic acid, e.g.
Condensation Polymerisation When the monomers do not contain carbon to carbon double they cannot undergo an addition reaction. Instead when the small molecules combine to form a polymer, a small molecule, often water, is removed between the monomer molecules in a condensation reaction. i.e. H O O H H H HO OH 2H2O NOTE both ends of the monomers have to be reactive. Polyesters Like esters, polyesters are formed from alkanols (OH) and carboxylic acids (COOH). As both ends of the molecules have to be reactive polyesters are often formed from alkanols containing two OH groups – diols. – 1,2 - diol The carboxylic acids also contain two COOH groups – dicarboxylic acid, e.g.
unit_3_-_plastics_and_polymers_-_summary_notes.docx