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Chemistry
Paper 2
Condensation Polymers (Polyesters)
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Cards (23)
What type of polymers are polyesters classified as?
Condensation polymers
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What are polyesters made using?
Ester links
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What is the process of forming polyesters from monomers?
Combine
dicarboxylic acid
and
diol
Remove OH from acid and H from alcohol
Form water molecule
Create
ester link
Repeat with multiple monomers
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What type of acid is used in making polyesters?
Dicarboxylic acid
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What type of alcohol is used in making polyesters?
Diol
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What do the colored rectangles in molecular diagrams represent?
The rest of the
molecule
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What happens to the dicarboxylic acid during polymer formation?
It gives up its
OH group
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What does the diol give up during the formation of polyesters?
A hydrogen atom from its
OH group
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What is formed when the dicarboxylic acid and diol combine?
A
water molecule
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What is the ester link in polyesters?
The bond between
dicarboxylic acid
and
diol
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Why is the initial product of polyester formation called a dimer?
It consists of two
monomers
combined
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What must be done to show the repeating unit of a polyester?
Remove
OH
and H from ends
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What notation is used to represent the number of
monomers
in
polyesters
?
The letter n
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How many water molecules are formed per repeat unit in polyesters?
Two
water molecules
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Why are they called condensation polymers?
They release
water
during formation
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What is a requirement for monomers in condensation polymers?
Each must have at least two
functional groups
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What is an example of a dicarboxylic acid used in polyesters?
Ethane dicarboxylic acid
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What is an example of a diol used in polyesters?
Ethane diol
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What polyester is formed from ethane dicarboxylic acid and ethane diol?
Poly ethyl ethanoate
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What is a key characteristic of polyesters regarding biodegradability?
They are generally
biodegradable
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How do polyesters differ from addition polymers like plastics?
Polyesters
are
biodegradable
, plastics are not
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What do microorganisms do to polyesters?
Break down the
ester links
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What is the environmental impact of addition polymers?
They stay in the environment for
ages
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