chpt 21 polymers

Question 1

What is addition polymerisation ?

Answer 1

1. addition polymerisation occurs when unsaturated monomers join together without loss of molecule or atom
2. polymer formed is an addition polymer

Question 2

What is condensation polymerisation ?

Answer 2

1. condensation polymer is formed when monomers combine to form a polymer, with the removal of a small molecule such as water or hydrogen chloride
2. polymers made by reacting two monomers of diff functional group
3. condensation polymerisation also forms small molecules eg water

Question 3

What type of polymer is polyester and what is it joined by ?e

Answer 3

1. condensation polymer
2. linked by ester linkages to join the repeat units togetther
   COO links
3. OH is removed from caboxylic acid on both ends
4. H is removed from other monomer eg diol of alcohol

Question 4

What type of polymer is a polyamide ?

Answer 4

1. condensation polymer
   2.linked by amide linkages that joins repeat units together
2. OH lost by carboxylic acid on both ends
3. H lost by amide
   Forms CON link

Question 5

What are the differences btwn condensation and addition polymers ?

Answer 5

1. addn polymers only contain unsaturated monomers. condensation polymers require functional groups on both ends of monomer
2. only polymer is formed for addn polymer. cdn polymerisation also forms small molecules eg water
3. addn polymer and monomers have same empirical formula and composition of mass. cdn polymer does not have same empirical formula as monomers as they cut off small molecules.
4. mass of monomers = mass of addn polymer. mass of monomer NOT = masof cdn polymer bs of OH and H released

Question 6

What is depolymerisation ?

Answer 6

1. polymers undergo depolymerisation through acid hydrolysis
2. polymers break down in water with the presence of a acid catalyst to form the monomers