Condensation polymerisation - polyesters , 54-55 Flashcards
What is condensation polymerisation?
Condensation polymerisation is the joining of two monomers with the elimination of a small molecule, such as water or HCl.
What is required from the monomers for condensation polymerisation to occur?
- Requires monomers with two different functional groups. - A functional group on one monomer unit bonds to a different functional group on another monomer unit.
What are the two common types of polyester made from?
1)- one monomer is a dicarboxylic acid with two -COOH groups. - the other monomer is a diol with two - OH groups. 2)Polyesters made by reacting just one type of monomer unit containing -COOH and -OH groups.
Write out the reaction for the formation of a polyester from a dial and a dicarboxylic acid.
Write out the reaction for the formation of a polyester from one monomer containing -COOH and -OH groups.
Write out the reaction for the formation of Terylene.
- Name the two reactants.
- Ethane-1,2-diol and Benzene-1,4-dicarboxylic acid
During condensation polymerisation what happens between the hydroxyl group and the carboxyl group?
A bond forms between the hydroxyl group and on the diol and a carboxyl group on a dicarboxylic acid.
- An ester linkage forms, and water is eliminated.
What are the uses of polyesters?
- What are the good and bad properties of polyesters?
Polyesters are used i making carpets, sports clothing and shirts. In clothing and bedding, polyesters are often blended with cotton.
- Polyester is a strong fibre which is resistant to stretching, shrinking and chemical attack.
- Polyester burns easily, should not be exposed to naked flames.
Write out the condensation polymerisation reaction of poly(lactic acid).
What are the uses of poly(lactic acid)?
Poly(lactic acid) is biodegradable and there has been much recent interest in its use for food and drink cartons.
