i) Explain why polypropylene is mainly produced by the coordination polymerization, but not by the free radical, anionic, and cationic polymerizations. ii) Write reaction mechanism to account for the formation of polypropylene by the coordination polymerization.

i) Explain why polypropylene is mainly produced by the coordination polymerization, but not by the free radical, anionic, and cationic polymerizations. ii) Write reaction mechanism to account for the formation of polypropylene by the coordination polymerization.

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter22: Substituted Hydrocarbons And Their Reactions

Section22.5: Polymers

Problem 23SSC

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Concept explainers

Polymerization Kinetics

Polymerization is a 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 diverge in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes. Polymerization is generally classified into step-growth and chain polymerization. Polymers are categorized into linear polymer and cross-linked polymers that are produced either by condensation or additional polymerization.

Question

i) Explain why polypropylene is mainly produced by the coordination
polymerization, but not by the free radical, anionic, and cationic
polymerizations.
ii) Write reaction mechanism to account for the formation of polypropylene by the
coordination polymerization.

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