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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Co-Casting Highly Selective Dual-Layer Membranes with Disordered Block Polymer Selective Layers.

Nicholas Hampu1, Jay R Werber2, Marc A Hillmyer2

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.

ACS Applied Materials & Interfaces
|September 28, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed dual-layer ultrafiltration (UF) membranes using a novel co-casting technique. These membranes offer high water permeability and selectivity, paving the way for scalable fabrication of advanced filtration materials.

Keywords:
block polymerco-castingcomposite membraneorder−disorder transitionpermeability-selectivityultrafiltration

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Membrane Technology

Background:

  • Developing high-performance membranes for ultrafiltration (UF) is crucial for water purification and separation processes.
  • Existing membranes often face trade-offs between permeability and selectivity, limiting their efficiency.
  • Block copolymers offer potential for creating well-defined nanostructures for advanced membrane applications.

Purpose of the Study:

  • To fabricate highly selective and water-permeable dual-layer UF membranes using a co-casting technique.
  • To investigate the influence of polymer concentration and processing conditions on membrane properties.
  • To demonstrate a scalable method for producing block copolymer-based membranes.

Main Methods:

  • Fabrication of dual-layer membranes via co-casting of poly(methyl methacrylate-stat-styrene)-block-poly(lactide) and polysulfone (PSF).
  • Utilized spin coating, rapid drying, and immersion into an ice water coagulation bath to form the selective layer.
  • Employed non-solvent-induced phase separation for precipitating the support layer and subsequent removal of the poly(lactide) block.

Main Results:

  • Achieved highly selective and water-permeable UF membranes with a disordered block copolymer selective layer and a PSF support.
  • Demonstrated tunable permeability by adjusting PSF casting solution concentration while maintaining size-selectivity.
  • Eliminating thermal annealing significantly increased water permeability without compromising selectivity due to kinetically trapped nanostructures.

Conclusions:

  • The co-casting technique enables the scalable fabrication of dual-layer block copolymer membranes with high permeability and selectivity.
  • The developed membranes show promise for efficient water purification and other separation applications.
  • This approach offers a pathway to overcome the permeability-selectivity trade-off in membrane technology.