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Chemistry A-Level > 6.2.3 - Polyesters and Polyamides > Flashcards

6.2.3 - Polyesters and Polyamides Flashcards

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1
Q

What is condensation in
terms of polymers?

A

Small molecule eliminated (usually H2O) to form
a larger molecule

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2
Q

How many monomers are
condensation polymers
usually formed from?

A

two

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3
Q

What properties do these
monomers forming
condensation polymers
have?

A

Each has two functional groups

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4
Q

Examples of condensation
polymers?

A

Polyesters
Polyamides
Polypeptides

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5
Q

What is the linkage in a
polyester?

A

R-COO-R’

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6
Q

What molecule is eliminated
in formation of a polyester?

A

H2O

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7
Q

What are the two monomers
which form a polyester
(generic names and
structures)?

A

Diol and dicarboxylic acid or a molecule with both
alcohol and a carboxylic acid functional groups

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8
Q

What is the linkage in a
polyamide?

A

CONH

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9
Q

What is the linkage in a
polyamide?

A

CONH

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10
Q

Which molecule is
eliminated when a
polyamide is formed?

A

H2O

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11
Q

What are the two monomers
used to form a polyamide
(generic names and
structures)?

A

Diamine and dicarboxylic acid

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12
Q

Why are poly(alkenes) not
biodegradable?

A

Non-polar C-H and C-C bonds

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13
Q

Why is it bad to burn
poly(alkenes)?

A

Releases CO2, CO, C (soot) and other toxic
chemicals from monomers

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14
Q

Where do most
poly(alkenes) end up?

A

Landfill sites

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15
Q

Why can condensation
polymers be broken down?

A

They have polar bonds

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16
Q

How are condensation
polymers broken down?

A

Hydrolysis (opposite of condensation)

17
Q

What is the difference
between addition and
condensation
polymerisation?

A

Condensation makes the polymer and eliminates
a small molecule; addition polymerisation breaks
C=C to form only one product (just the polymer).

18
Q

Explain hydrogen bonding
between polyamides

A

Both C=O and N-H are polar bonds, as N’s electronegativity >
H’s and O’s electronegativity > C’s.
Hydrogen bonding between H + and O - in different
molecules
Uses the lone pair of electrons on the O at

19
Q

Why do polyesters not show
hydrogen bonding?

A

All O-H bonds are removed during polymerisation

Chemistry A-Level (35 decks)

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