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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Supramolecular polymer transformation: a kinetic study.

Jonathan Baram1, Haim Weissman, Boris Rybtchinski

  • 1Department of Organic Chemistry, The Weizmann Institute of Science , Rehovot 76100, Israel.

The Journal of Physical Chemistry. B
|September 20, 2014
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Summary

Supramolecular kinetics reveal how a bolaamphiphilic perylene diimide dimer rearranges in water/THF mixtures. Hydration dynamics and entropic factors drive nucleation, with off-pathway intermediates forming above 55 °C.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding supramolecular kinetics is key to self-assembly mechanisms.
  • A previously reported bolaamphiphilic perylene diimide dimer system is kinetically trapped in water.
  • This system rearranges into a more ordered assembly in water/THF mixtures.

Purpose of the Study:

  • To conduct a kinetic mechanistic study of the supramolecular transformation process.
  • To elucidate the role of hydration dynamics and entropic factors in nucleation.
  • To investigate the formation of off-pathway intermediates at elevated temperatures.

Main Methods:

  • UV-vis spectroscopy was employed to monitor the transformation kinetics.
  • The Kolmogorov-Johnson-Mehl-Avrami (KJMA) model was used for data fitting.
  • Seeding experiments were performed to understand the transformation mechanism.

Main Results:

  • The transformation involves a rapid decrease in the red-shifted absorption band.
  • Kinetic data fitting yielded activation parameters, indicating a process without covalent unit detachment.
  • Hydration dynamics significantly influences nucleation, with dominant entropic contributions.
  • Off-pathway intermediates formed upon heating above 55 °C, halting the transformation.

Conclusions:

  • The study provides mechanistic insights into kinetically controlled supramolecular polymer transformations.
  • Understanding these noncovalent processes is crucial for the rational design of advanced materials.
  • Entropic factors and hydration dynamics are critical for nucleation in this system.