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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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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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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 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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Related Experiment Video

Updated: Jul 23, 2025

Procedure for the Transfer of Polymer Films Onto Porous Substrates with Minimized Defects
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Correction: Passive particle transport using a transversely propelling polymer "sweeper".

K R Prathyusha1

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30318, USA. krprathyusha@gmail.com.

Soft Matter
|July 17, 2023
PubMed
Summary

This correction clarifies a previous study on passive particle transport. It addresses details regarding the transversely propelling polymer "sweeper" mechanism for enhanced microparticle manipulation.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Microfluidics

Context:

  • Previous research explored passive particle transport using novel polymer structures.
  • Understanding efficient microparticle manipulation is crucial for various applications.

Purpose:

  • To correct and clarify details within the original publication.
  • To ensure accurate representation of the polymer 'sweeper' mechanism.

Summary:

  • This entry serves as a correction to the original article 'Passive particle transport using a transversely propelling polymer "sweeper"'.
  • It rectifies specific information presented in the initial publication regarding the polymer structure and its transport capabilities.

Impact:

  • Ensures the scientific record is accurate for researchers in soft matter and microfluidics.
  • Facilitates correct understanding and future development of polymer-based particle transport systems.