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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

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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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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Related Experiment Video

Updated: Sep 27, 2025

Bio-inspired Polydopamine Surface Modification of Nanodiamonds and Its Reduction of Silver Nanoparticles
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Polymer Grafting to Polydopamine Free Radicals for Universal Surface Functionalization.

Mitchell D Nothling1, Christopher G Bailey2, Lucy L Fillbrook1

  • 1School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia.

Journal of the American Chemical Society
|April 11, 2022
PubMed
Summary

Polydopamine (PDA) primes diverse surfaces for polymer grafting via its inherent radicals. This simple method covalently attaches vinyl polymers, enabling new material properties and tunable composites.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Chemistry

Background:

  • Free radical polymerization (FRP) enables versatile surface modification.
  • Polydopamine (PDA) offers universal surface adhesion.
  • Developing methods for covalent polymer grafting onto various substrates is crucial.

Purpose of the Study:

  • To utilize polydopamine's intrinsic radicals for initiating free radical polymerization.
  • To demonstrate covalent polymer attachment onto diverse surfaces.
  • To create functionalized materials and polymer-PDA composite networks.

Main Methods:

  • Surface functionalization with polydopamine (PDA).
  • Free radical polymerization (FRP) initiated from PDA-primed surfaces.
  • Characterization using 1H nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopy.

Main Results:

  • Covalent attachment of vinyl polymers to glass, cotton, paper, sponge, and stainless steel.
  • Imparting enhanced hydrophobicity, fluorescence, and temperature responsiveness to surfaces.
  • Formation of tunable polydopamine-polymer composite organo-/hydrogels via radical cross-linking.

Conclusions:

  • PDA serves as an effective surface primer for FRP, enabling covalent polymer conjugation.
  • The strategy allows for versatile functionalization of both porous and nonporous materials.
  • This approach provides a straightforward route for imparting diverse functionalities to a wide range of surfaces.