ORGANIC CHEMISTRY - polymerisation Flashcards
what is condensation?
- small molecule eliminated ( usually H2O ) to form a larger molecule
how many monomers are condensation polymers usually formed from?
2
what properties do these monomers forming condensation polymers have?
Each has two functional groups
examples of condensation polymers?
polyesters
polyamides
polypeptides
linkage in polyester?
ester link
what molecule is eliminated in the formation of polyester?
H2O
what are the two monomers which form a polyester?
- diol
- dicarboxylic acid
which monomers is Terylene made from?
Benzene-1,4-dicarboxylic acid
Ethane-1,2-diol
draw the repeating unit of terylene?
draw/ image on pmt
what is Terylene used for?
- as a fibre for making clothes
what is the linkage in a polyamide?
peptide/amide linkage
which molecule is eliminated when polyamide is formed?
H2O
what are the 2 monomers used to form a polyamide?
diamine and dicarboxylic acid
examples of polyamides?
Nylon, Kevlar
which monomers is Nylon-6,6 made from?
1,6-diaminohexane
Hexandioic acid
draw the repeating unit of Nylon-6,6.
draw/image on pmt
if you are making nylon in a lab, which monomers are you using and why? what molecule is eliminated?
hexane-1,6-di acyl chloride
rate of reaction much faster
Hcl
what is kevlar used for?
bullet proof vests
which monomers is kevlar made from?
1,4-diaminobenzne
Benzene-1,4-dicarboxylic acid
draw repeating unit of kevlar?
draw/image on pmt
why is kevlar so strong?
rigid chains and close packing of flat aromatic rings
why are poly alkenes not biodegradable?
due to non polar C-H and C-C bonds
why is it bad to burn poly(alkenes)?
CO2, CO, C soot released
where do most poly(alkenes) end up?
land fill sites
