Deck 14: Synthetic Polymers

Question 1

An example of a polyurethane is

A)
B)
C)
D)
E)

Answer 1

Question 2

The repeating unit of polypropylene is:

A)
B)
C)
D)
E)

Answer 2

Question 3

Dacron is an example of a

A) polyamide.
B) polyacrylate.
C) polyol.
D) polyester.
E) polyurethane.

Answer 3

polyester.

Question 4

Which of the following structures would represent the repeating unit of an alternating styrene-acrylonitrile copolymer?

A)
B)
C)
D)
E) None of these represent the copolymer unit.

Question 5

The repeating monomer unit in styrofoam cups is:

A) ethylene
B) vinyl chloride
C) styrene
D) tetrafluoroethylene
E) propene

Question 6

The polymer that is not formed by the step-growth mechanism is:

A) polyethylene
B) nylon
C) kevlar
D) dacron
E) polyurethane

Question 7

Which of the following arrangements indicate a crosslinked homopolymer?

A)
B)
C)
D)
E) both B and C

Question 8

Step-growth polymers differ from chain-growth polymers in that they

A) are more water soluble.
B) are generally prepared from difunctional monomers.
C) have more highly branched structures.
D) are thermosetting whereas chain-growth polymers are thermoplastic.
E) are formed by 1,4- instead of 1,2-addition.

Question 9

The arrangement -AAAAABBBBB- of monomers A and B in a copolymer represents

A) an alternating copolymer.
B) a random copolymer.
C) a block copolymer.
D) a graft copolymer.
E) a syndiotactic copolymer.

Question 10

What determines the density of a polyurethane foam?

A) the amount of ammonia gas released
B) the amount of carbon dioxide released
C) the amount of oxygen absorbed
D) the solubility of the reactants
E) the amount of nitrogen absorbed

Question 11

An example of a polyamide repeating unit is:

A)
B)
C)
D)
E)

Question 12

Nylon 6 is a polymer of caprolactam.What is the structure of caprolactam?

A)
B)
C)
D)
E)

Question 13

A polymer has the repeating unit drawn below: From what two monomers is this polymer made?

A)
B)
C)
D)
E)

Question 14

The isoprene unit is common in many synthetic and natural polymers.Isoprene is:

A)
B)
C)
D)
E)

Question 15

The monomer unit of the synthetic polymer teflon is:

A) ethylene
B) vinyl chloride
C) styrene
D) tetrafluoroethylene
E) propene

Question 16

An example of a synthetic polymer is:

A) RNA
B) nylon
C) starch
D) silk
E) cellulose

Question 17

The use of Superglue involves a polymerization of methyl 2-cyanopropenoate and water.What is the structure of methyl 2-cyanopropenoate?

A)
B)
C)
D)
E)

Question 18

Toluene-2,4-diisocyanate (2,4-TDI) is a very important chemical in the synthesis of polyurethanes used in foam pillows and freezer insulation.What is the structure of 2,4-TDI?

A)
B)
C)
D)
E)

Question 19

The monomer unit of PVC pipe is:

A) ethylene
B) vinyl chloride
C) styrene
D) tetrafluoroethylene
E) propene

Question 20

Which of the following arrangements would indicate a graft copolymer?

A)
B)
C)
D)
E)

Question 21

What two families of compounds react in a step growth polymerization to give a polyester?

A) alcohol/carboxylic acid
B) carboxylic acid/amine
C) alcohol/amine
D) alcohol/ether
E) carboxylic acid/ether

Question 22

Free radical polymerization is dependent on radical stabilities.Which of the following is the most stable free radical?

A)
B)
C)
D)
E)

Question 23

Termination events in free radical addition polymerization involve:

A) radical decay
B) radical disproportionation
C) radical propagation
D) radical coupling
E) both b and d

Question 24

Which monomer can be used to prepare the following polymer?

A)
B)
C)
D)
E)

Question 25

A step growth polymer has the following repeating unit: From what two monomer units is this made?

A)
B)
C)
D)
E)

Question 26

A reactive intermediate in the base-mediated polymerization of methyl acrylate (CH₂=CHCO₂CH₃) is:

A)
B)
C)
D)
E)

Question 27

A good initiator for a free radical addition polymerization is:

A) bromine
B) oxygen
C) benzene
D) benzoyl peroxide
E) acetyl chloride

Question 28

An intermediate in the free radical polymerization of propylene (CH₂=CHCH₃) initiated by benzoyl peroxide [C₆H₅C(=O)-O-O-C(=O)C₆H₅] is:

A)
B)
C)
D)
E)

Question 29

A compound that can be used to crosslink poly(vinyl alcohol) by ester linkages is:

A)
B)
C)
D)
E)

Question 30

An example of a polyether that can be prepared from the epoxide ethylene oxide is:

A)
B)
C)
D)
E)

Question 31

A urethane is produced by reacting an alcohol with:

A) an isocyanate
B) an anhydride
C) styrene
D) a nitrile
E) an amide

Question 32

The following polymer would be best prepared from:

A)
B)
C)
D)
E)

Question 33

Ziegler-Natta catalysts, used to prepare linear polymer molecules, consist of:

A) Lewis acids and bases
B) alkali metal salts and organolithiums
C) organomagnesium and alcohols
D) organoaluminums and transition metal salts
E) benzoyl peroxides and linear radicals

Question 34

The polymer poly(vinyl alcohol) is best prepared from which of the following monomers:

A)
B)
C)
D)
E)

Question 35

What two families of compounds react to give a polyurethane?

A) alcohol/isocyanate
B) acid/ester
C) amine/amide
D) amine/ester
E) isocyanate/amine

Question 36

The step responsible for chain-branching in free-radical polymerizations is the

A) initiation step.
B) radical coupling.
C) radical disproportionation.
D) chain transfer.
E) radical addition.

Question 37

The preparation of which step-growth polymer does not involve elimination of a small molecule during the course of its formation?

A) urea-formaldehyde
B) polyamides
C) bakelite
D) polyurethanes
E) polyesters

Question 38

Kodel can be prepared most directly from:

A)
B)
C)
D)
E)

Question 39

Kel-F is the trade name for a copolymer used for rocket motors.Which monomer units will produce this copolymer?

A) CH₂=CF₂ and Cl₂C=CF₂
B) CH₂=CH₂ and CF₂=CCl₂
C) ClFC=CF₂ and CH₂=CF₂
D) CF₂=CF₂ and CH₂=CHF
E) CHCl=CH₂ and CH₂=CF₂

Question 40

The configurations of stereogenic centers in an atactic polymer are:

A) regular
B) random
C) alternate
D) the same
E) opposite

Question 41

What type of polymer continues to crosslink on heating to produce a hard, infusible material?

A) thermosetting
B) vulcanized
C) thermoplastic
D) linear
E) copolymer

Question 42

Vulcanization is a process to strengthen natural rubber by crosslinking polymer chains with what element?

A) sodium
B) titanium
C) sulfur
D) aluminum
E) phosphorus

Question 43

A cross-linked polymer

A) is a better elastomer than a linear polymer.
B) has a more rigid structure than a linear polymer.
C) cannot be prepared by linking chains of a linear polymer.
D) is generally more soluble in organic solvents than a linear polymer.
E) is a thermoplastic polymer.

Question 44

An example of a syndiotactic polymer is:

A) 5
B) 4
C) 3
D) 2
E) 1

Question 45

The process by which rubber is cross-linked is called

A) polymerization.
B) epimerization.
C) saponification.
D) vulcanization.
E) solidification.

Question 46

Which of the following polymers can be classified as a thermoplastic?

A) bakelite
B) polyurethane
C) urea-formaldehyde
D) polystyrene
E) none of these

Question 47

The configurations of all stereocenters in an isotactic polymer are:

A) regular
B) random
C) alternate
D) the same
E) the opposite

Question 48

The stereochemistry of the following polymer is referred to as:

A) isomeric
B) syndiotactic
C) atactic
D) isotactic
E) barbaric

Question 49

Which of the following is a thermosetting polymer?

A) polypropylene
B) teflon
C) dacron
D) polyester
E) bakelite