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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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Ultrafast Interfacial Self-Assembly toward Bioderived Polyester COF Membranes with Microstructure Optimization.

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Researchers developed novel covalent-organic framework (COF) membranes using plant-derived monomers. An optimized electric field system significantly enhanced membrane formation, leading to superior separation performance.

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ester‐linked covalent–organic framework membraneinterface microenvironment controlmolecular sievingprogrammable MWCOregulation of reaction kinetics

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Precise control over membrane microstructure (pore size, free volume, connectivity), thickness, and mechanical properties is crucial for self-standing membrane applications.
  • Covalent-organic frameworks (COFs) offer tunable properties for advanced separation technologies.

Purpose of the Study:

  • To synthesize novel ester-linked COF membranes using plant-derived phenolic monomers (ellagic acid and quercetin).
  • To optimize COF membrane microstructure via interfacial electric field systems.
  • To evaluate the performance of the developed COF membranes for separation applications.

Main Methods:

  • Synthesis of ester-linked COF membranes using ellagic acid, quercetin, and terephthaloyl chloride.
  • Optimization of membrane microstructure using three interfacial electric field systems: electric neutrality, positive, and negative electricity.
  • Analysis of the correlation between surfactant alkyl chain length and membrane properties (pore size, molecular weight cutoff).

Main Results:

  • The positively charged electric field system accelerated membrane formation, yielding denser membranes with uniform pores and improved flexibility.
  • Increased surfactant alkyl chain length resulted in more uniform pore sizes and reduced molecular weight cutoff.
  • The optimized COF membrane demonstrated high water permeance, excellent sieving capability, and robust mechanical and chemical stability.

Conclusions:

  • Novel plant-derived COF membranes were successfully synthesized and their microstructures optimized using electric field systems.
  • The developed COF membranes exhibit a promising combination of properties for advanced membrane-based separation science and technology.
  • This work highlights the potential of bio-based monomers and electric field manipulation for creating high-performance separation membranes.