synthetic polymers

Synthetic Polymers
Addition
Polymerisation
ethene --catalyst & heat--> poly(ethene)
long polymer chain
alkenes
make polymers
very large molecules
made up of monomers
react with themselves
plastics
difficult to dispose of
not biodegradable
bacteria not decompose back into soil
burried in landfil
filling up!
burnt
toxic fumes
thermoplastics
melted down and used again
intermolecular forces weak
break on heating
melted & remoulded
thermosetting plastics
hard at high temperature
UV sunlight may aid break down of some of them
intermolecular bonds strong
interlinking covalent bonds
heat
whole structure breaks down
CO2 capture and formation of PPC
energy.gov
royal society of chemistry
stephens mouldings website: plastic examples
recycling
difficult
separate out each type of plastic
Condensation
polymerisation
2 different monomers
react
expel small molecule
usually water
hence condensation
Nylon
starting monomers
1,6-diaminohexane
H2N(CH2)6NH2
hexanedioic acid
HOOC(CH2)4COOH
amide link produced
nylon = polyamide
Terylene
starting reactants
ethane-1,2-diol
benzene-1,4-dicarboxylic acid
ester linkage
terylene = polyester
17