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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Related Experiment Video

Updated: May 21, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Ultra-Low Density Covalent Organic Framework Sponges with Exceptional Compression and Functional Performance.

Chenhui Ding1, Yingying Du1, Tamara Fischer2

  • 1Macromolecular Chemistry and Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, Bayreuth, 95440, Germany.

Angewandte Chemie (International Ed. in English)
|March 17, 2025
PubMed
Summary

Researchers developed a novel, mechanically robust covalent organic framework (COF) sponge. This hierarchical porous material overcomes COF powder limitations for practical applications like catalysis and absorption.

Keywords:
AbsorptionCatalyticCompressibleCovalent organic frameworksSpongeUltralow density

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Covalent organic frameworks (COFs) offer tunable properties but traditional powders are difficult to process.
  • The brittleness of COF powders limits the mechanical stability of macroscopic COF objects.
  • Developing processable and mechanically stable COF materials is crucial for their practical applications.

Purpose of the Study:

  • To synthesize a continuous, hierarchically porous, and mechanically robust COF macroscopic object.
  • To overcome the brittleness limitations of conventional COF powders.
  • To explore the potential of the developed COF material in various applications.

Main Methods:

  • Template-assisted framework synthesis.
  • Fabrication of a continuous, interconnected open-cell COF structure with hollow sponge walls.
  • Characterization of porous structure, surface area, density, and mechanical stability.

Main Results:

  • A COF sponge with hierarchical porosity, high surface area (1655 m² g⁻¹), and ultralow density (2.2 mg cm⁻³) was successfully synthesized.
  • The COF sponge exhibited exceptional mechanical stability, retaining over 90% of its stress and height after 300,000 compressions at 50% strain.
  • The material demonstrated excellent solvent absorption capacity, catalytic performance, and reusability.

Conclusions:

  • The developed template-assisted method enables the creation of mechanically robust COF macroscopic objects.
  • This hierarchical porous COF sponge offers a promising platform for advanced applications, overcoming limitations of traditional COF powders.
  • The study broadens the development pathway for COF macroscopic objects, unlocking their practical potential.