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Related Concept Videos

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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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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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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Driven polymer transport through a periodically patterned channel.

Timo Ikonen1

  • 1VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland and Department of Applied Physics, Aalto University School of Science, P.O. Box 11000, FI-00076 Aalto, Finland.

The Journal of Chemical Physics
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Summary
This summary is machine-generated.

This study reveals that patterned nanochannels can filter polymers, acting as high-pass filters for longer polymer chains by controlling their movement through attractive and non-attractive patches.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Nanotechnology

Background:

  • Understanding polymer transport in confined geometries is crucial for nanotechnology.
  • Periodically patterned surfaces can influence polymer dynamics and self-assembly.
  • Controlling polymer motion at the nanoscale is key for developing advanced materials and devices.

Purpose of the Study:

  • To investigate the driven transport of polymers in two-dimensional periodically patterned channels.
  • To explore the complex dynamical behaviors, including giant diffusion and negative differential mobility.
  • To determine the potential of patterned channels as polymer filters.

Main Methods:

  • Langevin dynamics simulations in two dimensions.
  • Modeling channel walls with alternating attractive and non-attractive particle patches.
  • Analyzing polymer dynamics and transition mechanisms between trapping sites.

Main Results:

  • Observed rich dynamical behavior: giant diffusion and negative differential mobility.
  • Identified various transition mechanisms between attractive patches.
  • Demonstrated efficient high-pass filtering for polymers exceeding a threshold length (Nthr).

Conclusions:

  • Patterned nanochannels exhibit complex polymer transport dynamics.
  • The channel's filtering efficiency is tunable via patch length and driving force.
  • Findings suggest potential for fabricating polymer filtration devices using patterned nanochannels.