7 - Breaking down condensation polymers Flashcards
How can esters be hydrolysed?
Esters can be hydrolysed under acidic or basic conditions.
Outline base hydrolysis of esters.
Esters can be hydrolysed by hot aqueou alkali, e.g. NaOH. Each ester linkage is hydrolysed to: the sodium salt of a carboxylic acid -COO-Na+ and a hydroxyl group.
What forms from base hydrolysis of esters?
The sodium salt of the carboxylic acid: COO-Na+ and a hydroxyl group also forms, -OH.
Outline acid hydrolysis of esters.
Esters can be hydrolysed by hot aqueous acid, e.g. HCl. This is much slower than with an aqueous alkali. The monomer units of the polyester are produced.
What forms from Acid Hydrolysis of Esters?
The monomer units of the ester.
How is Hydrolysis actually carried out?
Hydrolysis is done by water, hence the aqeous. The acid/alkali are a catalyst.
How can Polyamides be Hydrolysed?
Polyamides can be hydrolysed by hot aqeuous acid/alkali.
What’s produced in Acid Hydrolysis of Polyamides?
In acid hydrolysis of a polyamide a dicarboxylic acid is produced with an ammonium salt of the diamine.
What’s produced in base hydrolysis of polyamides?
In base hydrolysis of a polyamide the sodium salt of teh dicarboxylic acid and diamine are forme.
