Quiz 14: Synthetic Polymers

An example of a synthetic polymer is: A) RNA B) nylon C) starch D) silk E) cellulose

The isoprene unit is common in many synthetic and natural polymers.Isoprene is: A) B) C) D) E)

Which of the following arrangements indicate a crosslinked homopolymer? A) B) C) D) E) both B and C

Which of the following arrangements would indicate a graft copolymer? A) B) C) D) E)

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)

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)

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

Nylon 6 is a polymer of caprolactam.What is the structure of caprolactam? A) B) C) D) E)

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.

The polymer that is not formed by the step-growth mechanism is: A) polyethylene B) nylon C) kevlar D) dacron E) polyurethane

An example of a polyurethane is A) B) C) D) E)

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.

Dacron is an example of a A) polyamide. B) polyacrylate. C) polyol. D) polyester. E) polyurethane.

The monomer unit of the synthetic polymer teflon is: A) ethylene B) vinyl chloride C) styrene D) tetrafluoroethylene E) propene

The monomer unit of PVC pipe is: A) ethylene B) vinyl chloride C) styrene D) tetrafluoroethylene E) propene

The repeating monomer unit in styrofoam cups is: A) ethylene B) vinyl chloride C) styrene D) tetrafluoroethylene E) propene

The repeating unit of polypropylene is: A) B) C) D) E)

A polymer has the repeating unit drawn below: From what two monomers is this polymer made? A) B) C) D) E)

An example of a polyamide repeating unit is: A) B) C) D) E)

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.

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

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

A urethane is produced by reacting an alcohol with: A) an isocyanate B) an anhydride C) styrene D) a nitrile E) an amide

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

An example of a polyether that can be prepared from the epoxide ethylene oxide is: A) B) C) D) E)

A step growth polymer has the following repeating unit: From what two monomer units is this made? A) B) C) D) E)

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

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

Which monomer can be used to prepare the following polymer? A) B) C) D) E)

Kodel can be prepared most directly from: A) B) C) D) E)

The polymer poly(vinyl alcohol) is best prepared from which of the following monomers: A) B) C) D) E)

The following polymer would be best prepared from: A) B) C) D) E)

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

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

A good initiator for a free radical addition polymerization is: A) bromine B) oxygen C) benzene D) benzoyl peroxide E) acetyl chloride

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

Free radical polymerization is dependent on radical stabilities.Which of the following is the most stable free radical? A) B) C) D) E)

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.

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)

The configurations of stereogenic centers in an atactic polymer are: A) regular B) random C) alternate D) the same E) opposite

The configurations of all stereocenters in an isotactic polymer are: A) regular B) random C) alternate D) the same E) the opposite

The stereochemistry of the following polymer is referred to as: A) isomeric B) syndiotactic C) atactic D) isotactic E) barbaric

An example of a syndiotactic polymer is: A) 5 B) 4 C) 3 D) 2 E) 1

Which of the following is a thermosetting polymer? A) polypropylene B) teflon C) dacron D) polyester E) bakelite

Which of the following polymers can be classified as a thermoplastic? A) bakelite B) polyurethane C) urea-formaldehyde D) polystyrene E) none of these

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

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

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.

The process by which rubber is cross-linked is called A) polymerization. B) epimerization. C) saponification. D) vulcanization. E) solidification.