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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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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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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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Phosphodiester Linkages01:01

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Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
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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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Updated: Apr 21, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Embedding Cleavable Enol Ether Linkages Into Cyclic Polymer Backbones Through REMP.

Jana Harb1, Fabien Boeda1, Laurent Fontaine1

  • 1Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS, Le Mans Université, Le Mans Cedex 9, France.

Macromolecular Rapid Communications
|April 20, 2026
PubMed
Summary
This summary is machine-generated.

Researchers created degradable cyclic polymers using ring-expansion metathesis copolymerization. These novel polymers break down under mild acidic conditions, offering sustainable and responsive material solutions.

Keywords:
alternating copolymerscyclic copolymersdegradable polymersdihydrofuranring‐expansion metathesis polymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Stimuli-responsive degradable polymers are crucial for sustainable materials.
  • Incorporating cleavable bonds into polymer backbones is a key strategy for degradability.

Purpose of the Study:

  • To synthesize novel degradable cyclic polymers.
  • To explore ring-expansion metathesis copolymerization (REMP) for creating these polymers.
  • To investigate the degradation behavior of the synthesized polymers.

Main Methods:

  • Ring-expansion metathesis copolymerization (REMP) of 2,3-dihydrofuran (DHF) with functionalized exo-(oxa)norbornene derivatives.
  • Utilized a sterically hindered ruthenium initiator (CB6).
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • Successfully synthesized alternating copolymers with high degrees of alternation.
  • Demonstrated degradation of the polymers under mild acidic conditions.
  • Identified hydrolysis of enol ether moieties as the degradation mechanism.

Conclusions:

  • Introduced a versatile platform for designing degradable cyclic polymers.
  • The synthesized polymers exhibit stimuli-responsive degradation via enol ether hydrolysis.
  • These materials hold promise for sustainable and responsive polymer applications.