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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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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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Dynamic Interfaces in Self-Healable Polymers.

Jiahui Liu1, Marek W Urban1

  • 1Department of Materials Science and Engineering Clemson University, Clemson, South Carolina 29634, United States.

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Summary
This summary is machine-generated.

This review explores how interfacial energy and polymer properties drive self-healing in materials. Understanding these dynamic interfacial processes is key to developing advanced self-healable polymers.

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Surface Science

Background:

  • Interfacial processes are fundamental in both biological and synthetic systems.
  • Interfacial tension quantifies the energy needed to create or join surfaces.
  • Interfacial phenomena are critical in the performance and development of polymeric materials.

Purpose of the Study:

  • To review recent advancements in dynamic interfacial processes for self-healing polymers.
  • To highlight the interplay between physics, chemistry, and self-healing mechanisms.
  • To discuss how interfacial energies contribute to material recovery.

Main Methods:

  • Review of recent literature on dynamic interfacial processes in polymers.
  • Analysis of the role of entropic interfacial energies in self-healing.
  • Examination of factors influencing self-healing, including copolymer composition, molecular weight, and dispersity.

Main Results:

  • Self-healing efficacy is directly linked to copolymer composition, monomer sequence, molecular weight, and polymer dispersity.
  • Stored entropic interfacial energies during damage are crucial for material recovery.
  • Properties like chain flexibility, shape-memory recovery, and interfacial interactions are impacted by polymer characteristics.

Conclusions:

  • Self-healing in polymers is a localized phenomenon with significant global effects on material properties.
  • Interfacial flow and shape memory effects are key drivers in developing self-healable materials.
  • Covalent and supramolecular rebonding strategies are central to advancing self-healable polymer development.