3 d) Early in the polymerization at lower conversion of the MVK monomer, the polymer chains formed are primarily linear. However, close to the end of the reaction, as most of the monomer is consumed, branched polymers may start to appear. Propose a possible rationale for the formation of branched polymer structures (hint: consider the types of termination reactions that may compete with polymerization when only little monomer is still present). 로 } } linear vs. branched

3 d) Early in the polymerization at lower conversion of the MVK monomer, the polymer chains formed are primarily linear. However, close to the end of the reaction, as most of the monomer is consumed, branched polymers may start to appear. Propose a possible rationale for the formation of branched polymer structures (hint: consider the types of termination reactions that may compete with polymerization when only little monomer is still present). 로 } } linear vs. branched

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter31: Synthetic Polymers

Section31.2: Stereochemistry Of Polymerization: Ziegler–natta Catalysts

Problem 4P

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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

d) Early in the polymerization at lower conversion of the MVK monomer, the
polymer chains formed are primarily linear. However, close to the end of the
reaction, as most of the monomer is consumed, branched polymers may start
to appear. Propose a possible rationale for the formation of branched polymer
structures (hint: consider the types of termination reactions that may compete
with polymerization when only little monomer is still present).
로
3 3
linear vs. branched

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Step 1: Polymerization of MVK Monomer

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Step 2: Branching polymerization of MVK polymers

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Step 3: Pathway of branching in termination reactions

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