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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Tailoring Robust 2D Nanochannels by Radical Polymerization for Efficient Molecular Sieving.

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Researchers developed strong, tunable graphene oxide (GO) membranes for molecular sieving. This breakthrough enhances separation performance and mechanical durability for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Two-dimensional (2D) nanochannels offer precise molecular or ionic sieving due to uniform channel sizes and tunable properties.
  • Key challenges in 2D nanochannel technology include controlling channel dimensions and maintaining high mechanical integrity.

Purpose of the Study:

  • To develop a general strategy for tailoring the d-spacing of graphene oxide (GO) membranes.
  • To enhance the mechanical strength of GO membranes while achieving controllable nanochannel sizes.
  • To evaluate the performance of modified GO membranes for molecular sieving applications.

Main Methods:

  • A radical-induced polymerization strategy using N-Vinylformamide was employed to modify graphene oxide (GO) membranes.
  • The inter-sheet gallery d-spacing was controllably tuned through this polymerization process.
  • Mechanical strength, water permeance, and solute selectivity were characterized under various conditions.

Main Results:

  • The modified GO membranes exhibited ultrahigh tensile strength up to 105 MPa.
  • The d-spacing was successfully tuned from 0.799 nm to 1.410 nm.
  • Water permeance reached up to 218 L m⁻² h⁻¹ bar⁻¹, a 1304% increase over pristine GO membranes, with stable performance over 200 hours.
  • High solute selectivity was maintained under harsh conditions (pH 4.0-10.0, 12 bar pressure, 40 °C).

Conclusions:

  • The radical-induced polymerization strategy effectively balances sieving performance and mechanical strength in GO membranes.
  • These tailored membranes represent a significant advancement for next-generation molecular sieving applications.
  • The developed method provides a versatile approach for creating robust and high-performance 2D nanochannel materials.