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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.
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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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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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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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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Updated: Jun 2, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Recyclable Millable Polyurethane based on Enaminone Bonds With Upcycled Mechanical Performance.

Xinyu Li1, Nanying Ning1,2,3, Bing Yu1,2,3

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.

Macromolecular Rapid Communications
|January 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a recyclable polyurethane using dynamic bonds. This novel material maintains and even enhances mechanical strength after multiple solvent-free recycling cycles, offering a sustainable solution for high-performance polymers.

Keywords:
cross‐linked polyurethaneenaminone dynamic bondreproducible processingreversible cross‐linked networks

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Area of Science:

  • Polymer Science
  • Materials Science

Background:

  • Thermoplastic polyurethanes (TPUs) are re-processable but degrade during reprocessing.
  • Thermoset polyurethanes offer excellent mechanical properties but are not recyclable due to permanent crosslinking.
  • Achieving a balance between recyclability and mechanical properties in polyurethanes remains a significant challenge.

Purpose of the Study:

  • To develop a novel, recyclable polyurethane (PU) with tunable mechanical properties.
  • To introduce a new dynamic bond system for creating re-processable and re-crosslinkable PU.
  • To demonstrate a solvent-free recycling method that enhances material performance.

Main Methods:

  • Synthesized a new re-processable millable polyurethane using a dynamic bond formed from enaminone and isocyanate reactions.
  • Utilized amine addition to trigger dissociation of cross-linked sites, converting the network into a linear polymer.
  • Re-crosslinked the linear polymer with isocyanate in a solvent-free Haake mixer to create new PU.
  • Investigated the effect of amine and isocyanate content on mechanical properties and recyclability.

Main Results:

  • The developed polyurethane exhibited re-processability and tunable network morphology.
  • A solvent-free, one-step melting method was established for PU recycling.
  • Mechanical properties, including tensile strength, were enhanced after multiple recycling cycles (up to 178.4% increase after four cycles).
  • The material demonstrated mechanical reinforcement post-recycling.

Conclusions:

  • A novel dynamic bond enables the creation of recyclable polyurethanes with excellent mechanical performance.
  • The solvent-free recycling process offers a feasible and sustainable approach for PU.
  • This method allows for customizable properties and mechanical reinforcement upon recycling, addressing a key challenge in polymer sustainability.