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Chemistry > CH29 Polymers > Flashcards

CH29 Polymers Flashcards

1
Q

What is condensation

A

Small molecules eliminated (usually water) to form a larger molecule

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2
Q

How many monomers are condensation polymers usually formed from

A

2

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3
Q

Properties of these monomers

A

2 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

Ester linkage

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6
Q

What molecules is eliminated in the formation of a polyester

A

H2O

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7
Q

2 monomers which form a polyester

A

Diol and dicarboxylic acid

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8
Q

What is the linkage in a polyamide

A

Peptide linkage

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9
Q

Which molecule is eliminated when forming a polyamide

A

H2O

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10
Q

2 monomers used to form a polyamide

A

Diamine

Dicarboxylic acid

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11
Q

Examples of polyamides

A

Nylon

Kevlar

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12
Q

What monomers used to make Nylon in lab - why

A

hexane-1,6-diacyl chloride - rate of reaction much faster, HCl eliminated

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13
Q

What is kevlar used for

A

Body armour
Helmets
Oven gloves

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14
Q

Why is kevlar so strong

A

Rigid chains and close packing of flat aromatic rings

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15
Q

What are polypeptides - what is the linkage

A

Polyamides made from 1 amino acid monomer - peptide linkage

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16
Q

Why are poly(alkenes) not biodegradeable

A

Non-polar C-H and C-C bonds

17
Q

Why is it bad to burn poly(alkenes)

A

Releases CO2, CO and C

18
Q

Where do most poly(alkenes) end up

A

Landfill sites

19
Q

Why can condensation polymers be broken down

A

They have polar bonds

20
Q

How are condensation polymers broken down

A

Hydrolysis

21
Q

Why does hydrolysis not happen in normal conditions

A

Very slow rate

22
Q

4 stages needed when recycling polymers

A

Collected
Sorted
Melted
Reformed

23
Q

Advantages of recycling polymers

A

Saves expense of crude oil and preserves it

Reduces landfill usage

24
Q

Disadvantages of recylcing polymers

A

Energy needed to collect sort and melt

Can only be done a limited amount of times

25
Q

Difference between addition and condensation polymerisation

A

Condensation makes the polymer and eliminated a small molecule
Addition breaks C=C to only form the polymer

26
Q

Explain hydrogen bonding between polyamides

A

Both C=O and N-H are polar
Hydrogen bonding between H+ and O- in different molecules
Uses the lone pair of electrons on the O atom

Chemistry (18 decks)

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