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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

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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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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.
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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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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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers.

Devavrat Sathe1, Junfeng Zhou1, Hanlin Chen1

  • 1School of Polymer Science and Polymer Engineering, University of Akron.

Journal of Visualized Experiments : Jove
|January 2, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a new chemical recycling to monomer (CRM) system using trans-cyclobutane fused cyclooctene (tCBCO) polymers. These polymers can be easily synthesized and efficiently depolymerized, offering a sustainable route for polymer waste management.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Chemical Engineering

Background:

  • Growing synthetic polymer consumption and waste accumulation necessitate sustainable material solutions.
  • Chemical recycling to monomer (CRM) offers a promising closed-loop polymer economy approach.
  • Previous limitations in CRM systems highlight the need for efficient and versatile methods.

Purpose of the Study:

  • To detail protocols for preparing trans-cyclobutane fused cyclooctene (tCBCO) monomers and polymers.
  • To demonstrate the preparation of elastic polymer networks and thermoplastic polymers via compression molding.
  • To showcase the depolymerization of both linear polymers and polymer networks.

Main Methods:

  • Ring-opening metathesis polymerization (ROMP) of tCBCO monomers.
  • Preparation of high ring strain E-alkene tCBCO monomers.
  • Living polymerization techniques.
  • Depolymerization procedures under mild conditions.

Main Results:

  • Successful synthesis of tCBCO-based monomers and polymers with diverse functionalities.
  • Demonstration of ambient temperature polymerization and quantitative depolymerization.
  • Preparation of elastic polymer networks and linear thermoplastic polymers.
  • Successful living polymerization of high ring strain monomers.

Conclusions:

  • The developed CRM system based on tCBCO polymers provides a sustainable and efficient route for polymer recycling.
  • The protocols enable versatile polymer network and thermoplastic preparation.
  • This approach contributes to a circular economy for polymers by enabling monomer recovery and reuse.