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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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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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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Related Experiment Video

Updated: Feb 22, 2026

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Recyclable Polydimethylsiloxane Network Crosslinked by Dynamic Transesterification Reaction.

Huan Zhang1,2, Chao Cai1,2, Wenxing Liu1,2

  • 1Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Scientific Reports
|September 21, 2017
PubMed
Summary

This study developed a recyclable polydimethylsiloxane (PDMS) elastomer using dynamic transesterification. The resulting material exhibits excellent solvent resistance and thermal stability, enabling repeated reprocessing for applications like micro-patterned stamps.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Polydimethylsiloxane (PDMS) is a versatile silicone polymer.
  • Developing recyclable and robust elastomers is crucial for advanced material applications.
  • Dynamic covalent chemistry offers pathways to create reprocessable thermoset materials.

Purpose of the Study:

  • To synthesize a crosslinked polydimethylsiloxane (PDMS) network with dynamic properties.
  • To investigate the thermal dynamic behavior and reprocessing capabilities of the synthesized elastomer.
  • To demonstrate the potential application of the PDMS elastomer in micro-patterning.

Main Methods:

  • Dynamic transesterification reaction between PDMS-diglycidyl ether and pripol 1017.
  • Zinc acetate (Zn(OAc)2) as a catalyst.
  • Creep-recovery and stress-relaxation tests for thermal dynamic investigation.
  • Hot pressing at 180°C for reprocessing.

Main Results:

  • A crosslinked PDMS network was successfully prepared.
  • The elastomer demonstrated excellent solvent resistance, even at high temperatures.
  • Mechanical properties were maintained after 10 reprocessing cycles via hot pressing.
  • The material was successfully used for constructing micro-patterned stamps repeatedly.

Conclusions:

  • The synthesized PDMS elastomer possesses high thermal stability and exceptional solvent resistance.
  • Its reprocessable nature, attributed to dynamic transesterification, distinguishes it from conventional thermoplastic PDMS elastomers.
  • This research expands the application scope of PDMS elastomers in areas requiring repeated use and harsh condition resistance.