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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.8K
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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.7K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Updated: Jan 15, 2026

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Wavelength-Orthogonal Photoinitiated Polymerization-Induced Microphase Separation for Stepwise Ionogel Curing.

Jongho Back1,2, Hyun-Joong Kim2, Marc A Hillmyer1

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431 ,United States.

ACS Applied Materials & Interfaces
|October 10, 2025
PubMed
Summary

Researchers developed a novel stepwise ionogel curing method using orthogonal photoinitiation. This strategy enhances ionogel stiffness by 140% without compromising ionic conductivity, offering a promising advancement for material science applications.

Keywords:
ionogelphotopolymerizationpolymerization-induced microphase separationstepwise curingwavelength orthogonality

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Ionogels often exhibit a trade-off between mechanical stiffness and ionic conductivity.
  • Postmodification strategies to improve stiffness after phase separation in ionogels are underdeveloped.

Purpose of the Study:

  • To develop a stepwise ionogel curing strategy to enhance stiffness while maintaining ionic conductivity.
  • To utilize wavelength-orthogonal photoinitiated polymerization-induced microphase separation (PIMS) for controlled ionogel fabrication.

Main Methods:

  • A two-step curing process involving blue light-initiated PIMS followed by UV-induced radical cross-linking.
  • Utilized macro-chain transfer agents and a latent benzophenone-based acrylate cross-linker.
  • Characterization techniques included FTIR, SAXS, and SEM to confirm reaction orthogonality and nanostructure integrity.

Main Results:

  • Successfully formed bicontinuous nanodomains via the first PIMS step.
  • The second UV-induced curing significantly increased cross-linking density and Young's modulus.
  • Achieved a 140% increase in stiffness (Young's modulus to 607 kPa) with only a 0.1% decrease in ionic conductivity (1.9 mS/cm).

Conclusions:

  • The stepwise ionogel curing strategy effectively enhances mechanical strength without sacrificing ionic conductivity.
  • This method preserves the ionogel nanostructure while significantly improving stiffness.
  • The approach is compatible with conventional single-step PIMS and offers a versatile route for advanced ionogel development.