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Related Concept Videos

Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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 species into...
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Molecular Springs in Dynamic Covalent Polymer Networks.

Ibrahim Oladayo Raji1, Mary Eisenhart1, Roshan Lama1

  • 1Department of Chemistry and Biochemistry, Miami University, 651 E High St, Oxford, Ohio 45056, United States.

Macromolecules
|March 2, 2026
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Summary
This summary is machine-generated.

New dynamic polymers featuring spring-like aromatic foldamers show enhanced energy dissipation and self-healing. These materials, utilizing dynamic Diels-Alder cross-links, offer superior performance for advanced applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Dynamic polymers are crucial for advanced applications requiring energy dissipation and damping.
  • Aromatic foldamers offer unique spring-like properties for material design.

Purpose of the Study:

  • To investigate the impact of incorporating aromatic foldamers into polymer networks.
  • To evaluate the influence of dynamic cross-linking on material properties.

Main Methods:

  • Synthesized polymer networks with aromatic foldamers.
  • Utilized dynamic Diels-Alder adducts and static cross-linkers.
  • Characterized mechanical, self-healing, and dampening properties.

Main Results:

  • Shorter polymer chains and increased aromatic foldamer units improved properties.
  • Dynamic Diels-Alder cross-links significantly enhanced mechanical and dampening performance.
  • Synergistic effects between foldamers and dynamic cross-links were observed.

Conclusions:

  • Aromatic foldamer-based polymer networks exhibit superior energy dissipation and self-healing.
  • Dynamic cross-linking is key to unlocking advanced material functionalities.
  • These findings pave the way for novel high-performance polymers.