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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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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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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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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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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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The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.
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Thermoreversible Diels-Alder Cross-Linking of BHMF-Based Polyesters: Synthesis, Characterization and Rheology.

Cornelis Post1,2, Paul van den Tempel3, Paula Herrera Sánchez1,3

  • 1University of Groningen, Zernike Institute for Advanced Materials, Macromolecular Chemistry & New Polymeric Materials, Nijenborgh 3, AG Groningen 9747, The Netherlands.

ACS Sustainable Chemistry & Engineering
|March 14, 2025
PubMed
Summary
This summary is machine-generated.

Researchers enhanced biobased 2,5-Bis(hydroxymethyl)furan (BHMF)-based polyesters by thermoreversibly cross-linking them. This improves thermal properties and reprocessability for potential commodity plastic applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biobased Polymers

Background:

  • 2,5-Bis(hydroxymethyl)furan (BHMF)-based polyesters are promising biobased and biodegradable furanic polymers.
  • Current thermal properties limit their use as commodity plastics.
  • Enhancing thermal stability and reprocessability is crucial for broader applications.

Purpose of the Study:

  • To improve the thermal properties and reprocessability of BHMF-based polyesters.
  • To investigate the thermoreversible cross-linking of BHMF polyesters using biobased bismaleimide.
  • To explore the effect of monomer spacer lengths on polymer properties and reaction kinetics.

Main Methods:

  • Enzymatic bulk polymerization of BHMF and aliphatic dimethyl esters.
  • Thermoreversible cross-linking via [4 + 2] cycloaddition with biobased bismaleimide (BM-689).
  • Characterization using in situ 1H NMR, rheology, TGA, and DSC.

Main Results:

  • Successful thermoreversible cross-linking of BHMF-based polyesters was achieved.
  • Varying spacer lengths influenced reaction rates, reversibility, and reprocessability.
  • In situ 1H NMR confirmed Diels-Alder adducts; rheology demonstrated reprocessability.

Conclusions:

  • Biobased BHMF-based polyesters can be effectively cross-linked for enhanced thermal and mechanical properties.
  • The cross-linking strategy maintains polymer recyclability.
  • This approach expands the potential applications of furanic polymers.