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Related Concept Videos

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 polymer...
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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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Polymer Classification: Architecture01:14

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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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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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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: Jan 13, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Elastomeric Polyolefin Thermosets with Great Extensibility.

Gadi Slor1, Quy Ong Khac1, Laura Roset Julià1

  • 1Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland.

ACS Materials Letters
|January 9, 2026
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Summary
This summary is machine-generated.

Researchers developed recyclable thermosetting polyolefin elastomers with superior mechanical properties and elasticity. These advanced rubber materials can be depolymerized, recovering valuable cycloheptene monomers for sustainable polymer design.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Sustainable Chemistry

Background:

  • High-performance rubber materials are crucial for various applications.
  • There is a growing need for recyclable polymers to reduce environmental impact.
  • Traditional thermosets are difficult to recycle due to irreversible cross-linking.

Purpose of the Study:

  • To synthesize novel thermosetting polyolefin elastomers with enhanced properties.
  • To investigate the recyclability of these new elastomers.
  • To explore the effect of activated charcoal on material properties and recyclability.

Main Methods:

  • Ring-opening metathesis polymerization of cycloheptene cross-linked with dicyclopentadiene.
  • Mechanical testing, thermomechanical analysis, and extensibility measurements.
  • Small- and wide-angle X-ray scattering for strain-induced crystallization analysis.
  • Depolymerization studies using Grubbs Catalyst 2nd Generation.

Main Results:

  • The synthesized thermosets showed enhanced chemical resistance, mechanical robustness, thermomechanical stability, and elasticity.
  • Extraordinary extensibility with strain at break >1700% due to strain-induced crystallization.
  • Successful depolymerization, recovering cycloheptene in 77%-92% yields.
  • Composites with activated charcoal exhibited improved properties and retained recyclability (60% cycloheptene yield).

Conclusions:

  • A new class of recyclable thermosetting polyolefin elastomers was successfully developed.
  • These materials offer a promising alternative to conventional high-performance rubbers.
  • The recyclability and tunable properties position these elastomers for sustainable material applications.