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

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
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...
2.0K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
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...
2.2K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
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.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.7K
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...
2.7K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.1K
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.
8.1K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.9K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Related Experiment Video

Updated: Sep 9, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

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Closed-loop recyclable cross-linked polymeric materials via dynamic transetherification.

Pawan Kumar1, Yashi Agarwal1, Soumabrata Majumdar2

  • 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, 208016, India. ramkrishna@iitk.ac.in.

Chemical Communications (Cambridge, England)
|August 29, 2025
PubMed
Summary
This summary is machine-generated.

This study demonstrates closed-loop recyclability for benzylic ether-based polymers. Recovered monomers re-synthesize polymers with original properties, and dynamic characteristics are tunable by adjusting crosslink spacing.

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Last Updated: Sep 9, 2025

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Polymers

Background:

  • Cross-linked polymers often face challenges in recycling and property modification.
  • Benzylic ether linkages offer potential for dynamic polymer networks.

Purpose of the Study:

  • To investigate the closed-loop recyclability of benzylic ether-based cross-linked polymers.
  • To explore the dynamic property tunability of these polymers.
  • To demonstrate monomer recovery and re-synthesis.

Main Methods:

  • Utilized transetherification for polymer degradation.
  • Recovered monomers through chemical processes.
  • Re-synthesized polymers from recovered monomers.
  • Systematically varied inter-crosslink distance to study property changes.

Main Results:

  • Achieved full degradability of polymers via transetherification.
  • Recovered monomers in high yields.
  • Re-synthesized polymers exhibited pristine-like material properties.
  • Demonstrated significant effects on stress relaxation by altering inter-crosslink distance.

Conclusions:

  • Established closed-loop recyclability for benzylic ether-based polymers.
  • Confirmed the ability to tune dynamic properties, specifically stress relaxation, through structural modification.
  • Highlighted the potential for sustainable polymer design and application.