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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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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 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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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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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Keteniminium-Mediated Postpolymerization Modification: Unlocking Emergent Properties in Polyacrylamides.

Kasun Wekasinghe1, Stephanie A Castillo1, Jaina R Bemis1

  • 1Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States.

Journal of the American Chemical Society
|June 11, 2025
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Summary

We developed a new method for polymer modification using amide activation, enabling direct postpolymerization modification of unactivated poly(acrylamide)s. This approach creates functional copolymers and introduces a pathway for designing degradable synthetic polymers.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Postpolymerization modification (PPM) enhances polymer functionality beyond direct polymerization.
  • Existing PPM for poly(acrylamide)s often requires harsh conditions or activated monomers, limiting accessibility.

Purpose of the Study:

  • To develop a direct PPM strategy for unactivated poly(acrylamide)s.
  • To introduce a novel method for creating functional and degradable synthetic polymers.

Main Methods:

  • Amide activation using trifluoromethanesulfonic anhydride (Tf2O) to form keteniminium ion intermediates.
  • Nucleophilic quenching of intermediates to convert pendant amides to aryl ketones.
  • Molecular characterization of resulting poly(acrylamide-co-vinyl ketone) copolymers.

Main Results:

  • Successful direct PPM of unactivated poly(acrylamide)s.
  • Formation of random copolymers with tunable functionalities.
  • Demonstrated controlled photodegradation of aryl vinyl ketone-containing copolymers under UV irradiation.

Conclusions:

  • The amide activation strategy provides a new route for poly(acrylamide) functionalization.
  • This method expands the scope of PPM for unactivated polymers.
  • The developed copolymers offer a pathway toward designing degradable synthetic materials with tunable properties.