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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Anionic Chain-Growth Polymerization: Overview01:20

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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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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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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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Updated: Sep 20, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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A Single Functionalization Agent for Heterotelechelic ROMP Polymers.

Mohammad Yasir1, Manvendra Singh1, Andreas F M Kilbinger1

  • 1Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland.

ACS Macro Letters
|June 8, 2022
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Summary

Synthesizing heterotelechelic polymers is now simpler and more efficient. A novel ring-opening metathesis polymerization method uses a single agent to create these versatile materials for diverse applications.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Heterotelechelic polymers are crucial for applications like bioconjugation, imaging, and sensing.
  • Traditional synthesis methods for these polymers are often complex and challenging.

Purpose of the Study:

  • To develop a highly efficient and simple method for preparing heterotelechelic polymers.
  • To utilize a single functionalization agent in ring-opening metathesis polymerization for this purpose.

Main Methods:

  • Employing a novel ring-opening metathesis polymerization (ROMP) strategy.
  • Utilizing a single functionalization agent to create a functional initiator from Grubbs' first-generation catalyst.
  • A functional dihydrofuran derivative is produced and used to terminate the polymerization, yielding a primary alcohol-terminated polymer.

Main Results:

  • Successful synthesis of heterotelechelic polymers with a primary alcohol terminus.
  • Demonstrated control over molecular weight by adjusting the monomer-to-catalyst ratio.
  • The method is efficient and utilizes inexpensive starting materials.

Conclusions:

  • This new method offers a straightforward and effective route to heterotelechelic polymers.
  • The simplicity and efficiency suggest it may become a preferred technique for synthesizing these important materials.
  • The resulting polymers are suitable for advanced applications in various scientific fields.