polymers Flashcards
what is condensation
small molecule eliminated to form a larger one
how many monomers are condensation polymers usually formed from
2
what properties do these monomers forming condensation polymers have
each has 2 functional groups
linkage in polyester
ester linkage
RCOOR’
what are the 2 monomers which form a polyester
diol and dicarboxylic acid
monomers terylene made from
benzene-1,4-dicarboxylic and ethane-1.2-diol
what is terylene used for
fibre for making clothes
linkage in a poly amide
peptide linkage
what are the 2 monomers used to form a polyamide
diamine and dicarboxylic acid
which monomers is nylon-6,6 made from
1,6-diaminohexane and hexanedioic acid
what is Kevlar used for
body armour, helmets, oven gloves
which monomers is Kevlar made from
1,4-diaminobenzene and benzene-1,4-dicarboxylic acid
why is Kevlar so strong
rigid chains and close packing of flat aromatic rings
why are polyalkenes not biodegradable
non polar C-H and C-C bonds
why is it bad to burn polyalkenes
releases CO2, CO, C and other toxic chemicals from monomers
four stages needed when recycling polymers
collected
sorted
melted
reformed
advantages of recycling polymers
energy and manpower is needed for collecting, sorting and melting the polymers, making it expensive
can only be done a few times
hydrogen bonding between polyamides
both C=O and N-H are polar bonds, as N electronegativity > H and o is greater than Cs
