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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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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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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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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Related Experiment Video

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Cyclic olefin copolymer plasma millireactors.

G Schelcher1, C Guyon, S Ognier

  • 1Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France. michael.tatoulian@chimie-paristech.fr.

Lab on a Chip
|June 25, 2014
PubMed
Summary

This study presents a new method for making atmospheric pressure plasma millireactors using photopatterning and sputtering. These reactors efficiently degrade acetaldehyde (98% conversion) in air.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Plasma Physics

Background:

  • Plasma millireactors offer a highly reactive environment for chemical processes.
  • Existing fabrication methods may not be suitable for atmospheric pressure operation.
  • Cyclic olefin copolymer (COC) is a potential material for microfluidic devices.

Purpose of the Study:

  • To develop a novel multistep fabrication process for atmospheric pressure plasma millireactors.
  • To integrate metallic electrodes onto a cyclic olefin copolymer chip.
  • To demonstrate the efficacy of the fabricated millireactors in degrading volatile organic compounds.

Main Methods:

  • Photopatterning and sputtering techniques were employed for electrode integration.
  • A sputtered silica layer was used as a protective barrier.
  • Plasma discharges were generated in the millichannel using air.
  • Acetaldehyde degradation was investigated as a model reaction.

Main Results:

  • A robust fabrication process for atmospheric pressure plasma millireactors was successfully developed.
  • The millireactors demonstrated stable air discharges within the millichannel.
  • A silica barrier effectively protected the polymer surface from plasma-induced alteration.
  • Achieved 98% acetaldehyde conversion at an input energy below 200 J L(-1).

Conclusions:

  • The developed fabrication process enables the production of effective plasma millireactors operating at atmospheric pressure.
  • These devices show significant potential for environmental applications, such as air purification.
  • The integration of a protective silica layer is crucial for device longevity and performance.