Question 1

Why is chain branching less common in anionic polymerization than in cationic polymerization?

Accepted Answer

The intermediate which leads t

Question 2

The pattern below is found in what type of polymer? AAAABBBBAAAABBBB

Accepted Answer

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

Question 3

Draw a short segment of neoprene, using four monomers.

Accepted Answer

The answer of Draw a short segment of neoprene, using...

Question 4

Which of the following statements best explains the process known as chain transfer?

Accepted Answer

A) a process that can control the rate of production of the polymer 
B) a process that can control the molecular weight of the polymer 
C) a process that can control the reactivity of the monomer 
D) a process that can slow down the polymerization reaction 
E) a process that can inhibit the polymerization reaction 
A) a process that can control the rate of production of the polymer 
B) a process that can control the molecular weight of the polymer 
C) a process that can control the reactivity of the monomer 
D) a process that can slow down the polymerization reaction 
E) a process that can inhibit the polymerization reaction

Question 5

Which of the following species can best serve as a radical initiator for radical polymerization?

Accepted Answer

A) ROH 
B) ROR 
C) ROOR 
D) RCOOR 
E) RCOOH 
A) ROH 
B) ROR 
C) ROOR 
D) RCOOR 
E) RCOOH

Question 6

Draw the products which would result if poly(ethylene terephthalate)were hydrolyzed in hot aqueous NaOH.

Accepted Answer

The answer of Draw the products which would result if...

Question 7

What are aramides?

Accepted Answer

A) aromatic polyester polymers 
B) aromatic amine polymers 
C) alkyl halide polymers 
D) aromatic polyamide polymers 
E) aliphatic polyamide polymers 
A) aromatic polyester polymers 
B) aromatic amine polymers 
C) alkyl halide polymers 
D) aromatic polyamide polymers 
E) aliphatic polyamide polymers

Question 8

Which of the following polymers is arranged in an isotactic configuration?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 9

Propose a synthesis of poly(vinyl alcohol)from H2C   CHO2CCH3.

Accepted Answer

1. (PhCO₂)₂

Question 10

What are elastomers?

Accepted Answer

A) elastic organic molecules that are added to polymers to make them harder 
B) plastics that stretch and then revert to their original shape 
C) polymers that are soft and sticky 
D) plastics that are hard and brittle 
E) elastic molecules that are added to polymers to make them stretch more 
A) elastic organic molecules that are added to polymers to make them harder 
B) plastics that stretch and then revert to their original shape 
C) polymers that are soft and sticky 
D) plastics that are hard and brittle 
E) elastic molecules that are added to polymers to make them stretch more

Question 11

What are common factors that enter into the choice of radical initiators for chain-growth polymerization?

Accepted Answer

1. A relatively weak bond like

Question 12

Show the mechanism for the formation of a segment of polystyrene containing two molecules of styrene and initiated by hydrogen peroxide.

Accepted Answer

The answer of Show the mechanism for the formation of...

Question 13

Identify the initiator in an anionic polymerization.

Accepted Answer

A) KOH 
B) BuLi 
C) CH3OOCH3 
D) BF3, H2O 
E) HCl 
A) KOH 
B) BuLi 
C) CH3OOCH3 
D) BF3, H2O 
E) HCl

Question 14

Show the three methods by which the following radical can be terminated.

Accepted Answer

a) @#IMG-DLM&_TB1830

Question 15

Identify the initiator in a cationic polymerization.

Accepted Answer

A) KOH 
B) BuLi 
C) CH3OOCH3 
D) BF3, H2O 
E) HCl 
A) KOH 
B) BuLi 
C) CH3OOCH3 
D) BF3, H2O 
E) HCl

Question 16

Give the monomer for the polymer teflon.

Accepted Answer

A) propylene 
B) acrylonitrile 
C) tetrafluoroethylene 
D) poly(vinyl acetate) 
E) styrene 
A) propylene 
B) acrylonitrile 
C) tetrafluoroethylene 
D) poly(vinyl acetate) 
E) styrene

Question 17

From which of the following compounds is Lucite or poly(methyl methacrylate)prepared?

Accepted Answer

A) CH2     CHCH3 
B) CH2     C(CH3)O2CCH3 
C) CH2     CHO2CCH3 
D) CH2     C(CH3)CO2CH3 
E) CH2     CHCO2CH3 
A) CH2     CHCH3 
B) CH2     C(CH3)O2CCH3 
C) CH2     CHO2CCH3 
D) CH2     C(CH3)CO2CH3 
E) CH2     CHCO2CH3

Question 18

Which of the following is a possible step to terminate a chain in the radical polymerization of ethylene?

Accepted Answer

A) ROOR + CH2     CH2 → ROCH2CH2OR 
B) CH2     CH2 + CH2
    CH2 → CH3CH   CHCH3 
C)  ∙ RO∙ + CH2
    CH2 → ROCH2
    CH2 
D)  ∙ ∙ ROCH2CH2 + CH2
    CH2 → ROCH2CH2CH2CH2 
E)  ∙ 2 RO-[CH2CH2]n-CH2CH2 →
RO-[CH2CH2]n-CH2CH2CH2CH2-[CH2CH2]n-OR 
A) ROOR + CH2     CH2 → ROCH2CH2OR 
B) CH2     CH2 + CH2
    CH2 → CH3CH   CHCH3 
C)  ∙ RO∙ + CH2
    CH2 → ROCH2
    CH2 
D)  ∙ ∙ ROCH2CH2 + CH2
    CH2 → ROCH2CH2CH2CH2 
E)  ∙ 2 RO-[CH2CH2]n-CH2CH2 →
RO-[CH2CH2]n-CH2CH2CH2CH2-[CH2CH2]n-OR

Question 19

Provide the structure of poly(vinyl chloride).

Accepted Answer

The answer of Provide the structure of poly(vinyl chloride)....

Question 20

Draw a segment of the polymer, using four monomers.

Accepted Answer

The answer of Draw a segment of the polymer, using...

Exam 27: Synthetic Polymers

Why is chain branching less common in anionic polymerization than in cationic polymerization?

The pattern below is found in what type of polymer? AAAABBBBAAAABBBB

Draw a short segment of neoprene, using four monomers.

Which of the following statements best explains the process known as chain transfer?

Which of the following species can best serve as a radical initiator for radical polymerization?

Draw the products which would result if poly(ethylene terephthalate)were hydrolyzed in hot aqueous NaOH.

What are aramides?

Which of the following polymers is arranged in an isotactic configuration?

Propose a synthesis of poly(vinyl alcohol)from H2C CHO2CCH3.

What are elastomers?

What are common factors that enter into the choice of radical initiators for chain-growth polymerization?

Show the mechanism for the formation of a segment of polystyrene containing two molecules of styrene and initiated by hydrogen peroxide.

Identify the initiator in an anionic polymerization.

Show the three methods by which the following radical can be terminated.

Identify the initiator in a cationic polymerization.

Give the monomer for the polymer teflon.

From which of the following compounds is Lucite or poly(methyl methacrylate)prepared?

Which of the following is a possible step to terminate a chain in the radical polymerization of ethylene?

Provide the structure of poly(vinyl chloride).

Draw a segment of the polymer, using four monomers.

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, Radicals

Mass Spectrometry, Infrared Spectroscopy, and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Nucleosides, Nucleotides, and Nucleic Acids

Pericyclic Reactions

Filters

Propose a synthesis of poly(vinyl alcohol)from H₂C CHO₂CCH₃.