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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Updated: Mar 13, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Reversible Polymer-Metal Mechanical Transitions Enabled by Electrochemical Modulation.

Santosh Thapa1, Defu Li2, Gao Liu2

  • 1Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, United States.

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|March 12, 2026
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Summary
This summary is machine-generated.

This study introduces a hierarchically ordered structure (HOS) polymer that reversibly transitions from polymer-like to metal-like mechanical properties. This tunable material offers new possibilities for advanced engineering applications.

Keywords:
Energy StorageMechanical PropertyPolymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Mechanical properties like elastic modulus and hardness are critical for engineering materials.
  • Existing materials often have fixed mechanical characteristics, limiting their application scope.

Purpose of the Study:

  • To develop a novel polymer system with dynamically tunable mechanical properties.
  • To investigate the reversible transformation between polymer-like and metal-like mechanical behaviors.

Main Methods:

  • Synthesis of a hierarchically ordered structure (HOS) polymer.
  • Electrochemical lithiation and delithiation processes to induce mechanical property changes.
  • Measurement of elastic modulus and hardness to quantify mechanical transitions.

Main Results:

  • The HOS polymer exhibited a 10-fold increase in elastic modulus and a 3-fold increase in hardness upon full lithiation, reaching aluminum-like levels.
  • These mechanical properties reverted to near-pristine polymer levels upon delithiation.
  • The reversible mechanical transformation demonstrated high repeatability over multiple electrochemical cycles.

Conclusions:

  • The HOS polymer system enables reversible transitions between polymer-like and metal-like mechanical states.
  • This tunable material provides a new avenue for designing advanced materials.
  • Potential applications include soft robotics and stimuli-responsive systems requiring adaptable mechanical properties.