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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Curved arrows are used to illustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic step(s). Be sure to account for all bond-breaking and bond-making steps. Select to Edit Arrows H H Select to Add Arrows > H CFCI: Select to Edit Arrows H Select to Edit Arrows

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Answer 2

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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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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

See solution

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