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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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 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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Polymers02:34

Polymers

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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...
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Postpolymerization Modification by Nucleophilic Addition to Styrenic Carbodiimides.

Hayden E Houck1, Kate A McConnell1, Conner J Klingler1

  • 1Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States.

ACS Macro Letters
|July 24, 2023
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Summary

We developed a novel styrenic carbodiimide monomer for versatile postpolymerization modification. This monomer enables the creation of dynamic covalent adaptable networks with tunable properties through simple guanylation reactions.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Carbodiimides are reactive functional groups with underexplored potential in polymer modification.
  • Developing new monomers for advanced polymer architectures is crucial for materials innovation.

Purpose of the Study:

  • To synthesize and polymerize a novel styrenic carbodiimide monomer.
  • To explore its utility in postpolymerization modification and create covalent adaptable networks.

Main Methods:

  • Radical polymerization (free and controlled) of the styrenic carbodiimide monomer.
  • Nucleophilic addition reactions with primary and secondary amines for guanylation.
  • Characterization of the resulting dynamic polymer networks.

Main Results:

  • The styrenic carbodiimide monomer readily polymerizes under various radical conditions.
  • Rapid nucleophilic addition with amines occurs under ambient conditions, forming stable guanidine linkages.
  • Covalent adaptable networks were successfully synthesized, showing tunable relaxation times based on guanidine structure and concentration.

Conclusions:

  • Styrenic carbodiimides are effective platforms for postpolymerization modification.
  • This approach provides a facile method for creating tunable dynamic polymer networks.
  • The developed materials hold promise for applications requiring adaptable and responsive materials.