Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene. The reason is to be explained. Concept introduction: Beside the free-radical mechanism, chain-growth polymerizations can also be initiated by anions or cations, resulting in anionic polymerization or cationic polymerization respectively. Styrene can undergo anionic polymerization using butyllithium as the initiator, which forms a negative charge on the growing chain instead of an unpaired electron. In the propagation steps, the reactive intermediates are anions. Termination occurs in anionic polymerization when an acid is added to the reaction mixture. The anion is neutralized in the resulting proton transfer, which ends the propagation cycle. Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene.

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Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.9YT

Interpretation Introduction

Interpretation:

Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene. The reason is to be explained.

Concept introduction:

Beside the free-radical mechanism, chain-growth polymerizations can also be initiated by anions or cations, resulting in anionic polymerization or cationic polymerization respectively. Styrene can undergo anionic polymerization using butyllithium as the initiator, which forms a negative charge on the growing chain instead of an unpaired electron. In the propagation steps, the reactive intermediates are anions. Termination occurs in anionic polymerization when an acid is added to the reaction mixture. The anion is neutralized in the resulting proton transfer, which ends the propagation cycle. Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene.

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Why propagation step produce energy in chain growth polymerizations?

Although styrene undergoes both cationic and anionic polymerizationequally well, one method is often preferred with substituted styrenes.Which method is preferred with each compound? Explain.

Although styrene undergoes both cationic and anionic polymerization equally well, one method is often preferred with substituted styrenes.Which method is preferred with each compound? Explain.

Answer 2

Question

Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.9YT

Interpretation Introduction

Interpretation:

Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene. The reason is to be explained.

Concept introduction:

Beside the free-radical mechanism, chain-growth polymerizations can also be initiated by anions or cations, resulting in anionic polymerization or cationic polymerization respectively. Styrene can undergo anionic polymerization using butyllithium as the initiator, which forms a negative charge on the growing chain instead of an unpaired electron. In the propagation steps, the reactive intermediates are anions. Termination occurs in anionic polymerization when an acid is added to the reaction mixture. The anion is neutralized in the resulting proton transfer, which ends the propagation cycle. Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene.

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Check out a sample textbook solution

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Answer 3

Question

Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.9YT

Interpretation Introduction

Interpretation:

Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene. The reason is to be explained.

Concept introduction:

Beside the free-radical mechanism, chain-growth polymerizations can also be initiated by anions or cations, resulting in anionic polymerization or cationic polymerization respectively. Styrene can undergo anionic polymerization using butyllithium as the initiator, which forms a negative charge on the growing chain instead of an unpaired electron. In the propagation steps, the reactive intermediates are anions. Termination occurs in anionic polymerization when an acid is added to the reaction mixture. The anion is neutralized in the resulting proton transfer, which ends the propagation cycle. Combination and disproportionation are not feasible termination steps for the anionic polymerization of styrene.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.9YT

Interpretation Introduction