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Related Concept Videos

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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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

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...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
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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Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Reprocessability in Engineering Thermosets Achieved Through Frontal Ring-Opening Metathesis Polymerization.

Julian C Cooper1,2, Justine E Paul1,3, Nabil Ramlawi4

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA.

Advanced Materials (Deerfield Beach, Fla.)
|April 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for recycling polyolefin thermosets, enabling multiple reuse cycles without adding special chemical groups. This advance promotes the circular economy for durable thermoset materials.

Keywords:
engineering thermosetsfrontal polymerizationmultigenerational materialsreprocessabilitythermoset sustainability

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Sustainable Polymers

Background:

  • Crosslinked thermosets offer excellent durability but pose significant recycling challenges.
  • Current recycling methods for thermosets are often complex or inefficient.

Purpose of the Study:

  • To demonstrate inherent reprocessability in industrially relevant polyolefin thermosets.
  • To develop a method for long-term material reuse without compromising performance.

Main Methods:

  • Utilizing frontal ring-opening metathesis polymerization (FROMP) during the curing process.
  • Preserving the activity of the metathesis catalyst to enable regeneration.
  • Investigating conditions for catalytic viability across multiple material generations.

Main Results:

  • Successfully achieved inherent reprocessability in polyolefin thermosets.
  • Demonstrated the ability to reclaim material performance across multiple reuse cycles.
  • Validated a straightforward and scalable remolding strategy.

Conclusions:

  • The findings present a significant conceptual advance for achieving a fully circular lifecycle for thermoset polymers.
  • This approach eliminates the need for additional functionalization, simplifying the recycling process.
  • The developed strategy is suitable for widespread adoption in the growing polyolefin thermoset market.