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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 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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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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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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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Sumanene-stacked supramolecular polymers. Dynamic, solvation-directed control.

Hiroaki Mizuno1, Hironobu Nakazawa2, Makoto Harada1

  • 1Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan. gaku@chem.titech.ac.jp.

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Summary

Pristine sumanene, a type of buckybowl, forms solution-state supramolecular polymers. These polymers exhibit dynamic control via external stimuli, with solvation being a key factor in their behavior.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Supramolecular polymers offer tunable properties through non-covalent interactions.
  • Buckybowls are promising building blocks for advanced materials.
  • Controlling polymer dynamics with external stimuli is crucial for functional applications.

Purpose of the Study:

  • To investigate the supramolecular polymerization of pristine sumanene in solution.
  • To demonstrate the dynamic control of sumanene-based supramolecular polymers.
  • To explore the role of solvation in the dynamic behavior of these polymers.

Main Methods:

  • Solution-state synthesis and characterization of sumanene supramolecular polymers.
  • Investigation of external stimuli (e.g., solvent changes) on polymer dynamics.
  • Spectroscopic and microscopic techniques to analyze polymer structure and behavior.

Main Results:

  • Sumanene successfully forms stable supramolecular polymers in solution.
  • The supramolecular polymerization of sumanene is dynamically controllable by external stimuli.
  • Solvation effects significantly influence the assembly and disassembly of sumanene polymers.

Conclusions:

  • Sumanene is a viable building block for solution-state supramolecular polymers.
  • External stimuli, particularly solvation, offer effective control over polymer dynamics.
  • This work provides guidelines for designing dynamic supramolecular polymers using buckybowls.