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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...
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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 properties that they exhibit. Additionally,...

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Related Experiment Video

Updated: May 15, 2026

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Covalent layer-by-layer assembly of redox-active polymer multilayers.

Xueling Feng1, Aysegul Cumurcu, Xiaofeng Sui

  • 1Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, Enschede, The Netherlands.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 15, 2013
PubMed
Summary

Researchers created robust, covalently linked redox-active thin films using poly(ferrocenylsilane) and poly(ethylene imine). These films show promise for electrochemical sensing and biofuel cells.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Layer-by-layer deposition is a versatile technique for creating functional thin films.
  • Redox-active polymers offer potential for electrochemical applications but often lack stability.
  • Covalent cross-linking can enhance the stability of multilayer polymer films.

Purpose of the Study:

  • To develop covalently connected, redox-active multilayer thin films.
  • To investigate the stability and properties of these novel films.
  • To explore their application in electrochemical sensing.

Main Methods:

  • Layer-by-layer deposition of poly(ferrocenyl(3-bromopropyl)methylsilane) and poly(ethylene imine).
  • Amine alkylation reaction for covalent cross-linking.
  • Characterization using UV-vis, FTIR, SPR, AFM, ellipsometry, and cyclic voltammetry.

Main Results:

  • Successfully formed stable, covalently linked multilayer thin films.
  • Demonstrated linear thickness increase with bilayer number.
  • Films remained intact during redox cycling, unlike electrostatically assembled films.
  • Effective electrochemical sensing of ascorbic acid and hydrogen peroxide.

Conclusions:

  • Covalently linked poly(ferrocenylsilane)/poly(ethylene imine) multilayers offer a robust platform.
  • These films exhibit enhanced stability and tailorable properties.
  • Potential applications in electrochemical sensing and biofuel cells are highlighted.