Question 1

Which of the following monomers is least likely to undergo cationic polymerization?

Accepted Answer

A) propylene 
B) isobutylene 
C) styrene 
D) methyl acrylate 
E) vinyl acetate 
A) propylene 
B) isobutylene 
C) styrene 
D) methyl acrylate 
E) vinyl acetate

Question 2

What are crystallites?

Accepted Answer

The regions of polym

Question 3

Provide a mechanism to show how H2C   CHCO2CH3 is polymerized using butyllithium as the initiator.

Accepted Answer

Question 4

Is acrylonitrile more likely to undergo anionic or cationic polymerization? Explain your answer.

Accepted Answer

Acrylonitrile is more likely t

Question 5

When 3-methyl-1-butene
CH2
    CHCH(CH3)2
undergoes cationic polymerization, the following expected carbocation is formed.
⊕
X-CH2-CH-CH(CH3)2
However, the following carbocation is also found in the reaction.
⊕
X-CH2-CH2-C(CH3)2
Explain.

Accepted Answer

The expected carbocation is a

Question 6

Draw a short segment of plexiglass, using five monomers.

Accepted Answer

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

Question 7

Provide the structure of poly(tetrafluoroethylene).

Accepted Answer

The answer of Provide the structure of poly(tetrafluoroethylene)....

Question 8

Which of the following species can best serve as an initiator for cationic polymerization?

Accepted Answer

A) ROOR 
B) ROH 
C) ROR 
D) AlCl3 
E) RCOOR 
A) ROOR 
B) ROH 
C) ROR 
D) AlCl3 
E) RCOOR

Question 9

Which of the following addition polymers results from the reaction below? nCF2
    CF2 
     ?

Accepted Answer

A) [   CF-CF   ]n 
B) [CF3-CF3]n 
C) [-CF2-CH   CHCF2-]n 
D) [-CF2-CF2-]n 
E) [-CF2     CF2-]n 
A) [   CF-CF   ]n 
B) [CF3-CF3]n 
C) [-CF2-CH   CHCF2-]n 
D) [-CF2-CF2-]n 
E) [-CF2     CF2-]n

Question 10

Provide the structure of Saran, an alternating copolymer of H2C   CHCl and H2C   CCl2.

Accepted Answer

Question 11

Which of the following species can best serve as an initiator for anionic polymerization?

Accepted Answer

A) CH3CH2CH2CH2Li 
B) BF3 
C) HOOH 
D) CH3CH2CH2CH2OH 
E) CH3CH2CH2CH2OCH2CH2CH2CH3 
A) CH3CH2CH2CH2Li 
B) BF3 
C) HOOH 
D) CH3CH2CH2CH2OH 
E) CH3CH2CH2CH2OCH2CH2CH2CH3

Question 12

What is the difference between natural rubber and Gutta-percha rubber?

Accepted Answer

A) Natural rubber is hard and brittle while gutta-percha is soft and rubbery. 
B) Natural rubber is natural while gutta-percha is synthetic rubber. 
C) Natural rubber has a cis configuration while gutta-percha has a trans configuration. 
D) Natural rubber and gutta-percha rubber are enantiomers. 
E) The monomer for natural rubber is isoprene while the monomer for gutta-percha is 1,3-butadiene. 
A) Natural rubber is hard and brittle while gutta-percha is soft and rubbery. 
B) Natural rubber is natural while gutta-percha is synthetic rubber. 
C) Natural rubber has a cis configuration while gutta-percha has a trans configuration. 
D) Natural rubber and gutta-percha rubber are enantiomers. 
E) The monomer for natural rubber is isoprene while the monomer for gutta-percha is 1,3-butadiene.

Question 13

Which of the following statements best describes what alpha olefins are?

Accepted Answer

A) polysubstituted ethylenes 
B) monosubstituted ethylenes 
C) disubstituted ethylenes 
D) ethylenes 
E) isoprenes 
A) polysubstituted ethylenes 
B) monosubstituted ethylenes 
C) disubstituted ethylenes 
D) ethylenes 
E) isoprenes

Question 14

Which of the following statements best describes what vulcanization means?

Accepted Answer

A) a process by which rigid and non-sticky rubber can be made soft and sticky 
B) a chemical process discovered by Charles Schultz in 1944 
C) the heating of rubber with sulfur 
D) a chemical process that destroys cross-linking in rubber 
E) all of the above 
A) a process by which rigid and non-sticky rubber can be made soft and sticky 
B) a chemical process discovered by Charles Schultz in 1944 
C) the heating of rubber with sulfur 
D) a chemical process that destroys cross-linking in rubber 
E) all of the above

Question 15

Natural rubber is a ________.

Accepted Answer

A) polyamide 
B) polyester 
C) polycarbonate 
D) polyurethane 
E) none of the above 
A) polyamide 
B) polyester 
C) polycarbonate 
D) polyurethane 
E) none of the above

Question 16

Which dimer (step-growth dimerization)will form from the following monomer?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 17

Draw the structure of the polymer produced in the following reaction.

Accepted Answer

The answer of Draw the structure of the polymer produced...

Question 18

What structural characteristic is shared by compounds used as radical initiators?

Accepted Answer

Such compounds posse

Question 19

The first polymer, invented by A. Parke in 1856, was ________.

Accepted Answer

A) Polyethlene 
B) Polyester 
C) Polystyrene 
D) Celluloid 
E) Teflon 
A) Polyethlene 
B) Polyester 
C) Polystyrene 
D) Celluloid 
E) Teflon

Question 20

What advantage does a Lewis acid like BF3 have over a proton-donating acid like HCl as a initiator in cationic polymerization?

Accepted Answer

The advantage of a Lewis acid

Exam 27: Synthetic Polymers

Which of the following monomers is least likely to undergo cationic polymerization?

What are crystallites?

Provide a mechanism to show how H2C CHCO2CH3 is polymerized using butyllithium as the initiator.

Is acrylonitrile more likely to undergo anionic or cationic polymerization? Explain your answer.

When 3-methyl-1-butene CH2 CHCH(CH3)2 undergoes cationic polymerization, the following expected carbocation is formed. ⊕ X-CH2-CH-CH(CH3)2 However, the following carbocation is also found in the reaction. ⊕ X-CH2-CH2-C(CH3)2 Explain.

Draw a short segment of plexiglass, using five monomers.

Provide the structure of poly(tetrafluoroethylene).

Which of the following species can best serve as an initiator for cationic polymerization?

Which of the following addition polymers results from the reaction below? nCF2 CF2 ?

Provide the structure of Saran, an alternating copolymer of H2C CHCl and H2C CCl2.

Which of the following species can best serve as an initiator for anionic polymerization?

What is the difference between natural rubber and Gutta-percha rubber?

Which of the following statements best describes what alpha olefins are?

Which of the following statements best describes what vulcanization means?

Natural rubber is a ________.

Which dimer (step-growth dimerization)will form from the following monomer?

Draw the structure of the polymer produced in the following reaction.

What structural characteristic is shared by compounds used as radical initiators?

The first polymer, invented by A. Parke in 1856, was ________.

What advantage does a Lewis acid like BF3 have over a proton-donating acid like HCl as a initiator in cationic polymerization?

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

Provide a mechanism to show how H₂C CHCO₂CH₃ is polymerized using butyllithium as the initiator.

When 3-methyl-1-butene CH₂ CHCH(CH₃)₂ undergoes cationic polymerization, the following expected carbocation is formed. ⊕ X-CH₂-CH-CH(CH₃)₂ However, the following carbocation is also found in the reaction. ⊕ X-CH₂-CH₂-C(CH₃)₂ Explain.

Which of the following addition polymers results from the reaction below? nCF₂ CF₂ _?

Provide the structure of Saran, an alternating copolymer of H₂C CHCl and H₂C CCl₂.

What advantage does a Lewis acid like BF₃ have over a proton-donating acid like HCl as a initiator in cationic polymerization?