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Related Concept Videos

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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Olefin Metathesis Polymerization: Overview01:13

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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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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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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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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Liquid Metal Initiator of Ring-Opening Polymerization: Self-Capsulation into Thermal/Photomoldable Powder for

Xiankai Li1,2, Mingjie Li1,2, Qinghui Shou3

  • 1Group of Biomimetic Smart Materials, CAS Key Lab of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Road 189, Qingdao, 266101, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|September 21, 2020
PubMed
Summary

Researchers developed a novel method to encapsulate liquid metal nanodroplets (EGaIn) in biodegradable polylactone shells using ring-opening polymerization. This creates stable, processable powders for advanced composite materials with unique electrical and thermal properties.

Keywords:
capsulationliquid metalsmultifunctional compositesphotomoldabilityring-opening polymerization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Liquid metal nanodroplets exhibit unique properties like fluidity and sintering ability but are difficult to incorporate into composites due to fragile shells.
  • Conventional methods struggle to homogeneously integrate liquid metal nanodroplets into various materials.

Purpose of the Study:

  • To develop a method for stabilizing liquid metal nanodroplets (EGaIn) for composite integration.
  • To create multifunctional composite materials with enhanced properties using EGaIn nanodroplets.

Main Methods:

  • Initiating ring-opening polymerization of lactones by sonicating liquid metal EGaIn.
  • Encapsulating EGaIn nanodroplets within tunable thickness polylactone shells via in situ polymerization.
  • Processing the encapsulated EGaIn into a stable, dispersible powder.

Main Results:

  • Achieved stable encapsulation of EGaIn nanodroplets in biocompatible and biodegradable polylactone shells.
  • The resulting powder exhibits high chemical stability and dispersibility in organic solvents.
  • Incorporation into thermoplastic composites via casting and molding yielded notch-insensitive tearing, electrical conductivity, and photothermal effects.

Conclusions:

  • Ring-opening polymerization initiated by EGaIn offers a pathway to produce stable, processable EGaIn capsule powders.
  • These powders enable the creation of multifunctional composites with tunable properties.
  • Potential applications include biomedicines, soft electronics, and smart robots.