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PreprintCC BYChemRxiv

Polymer-Assisted One-Dimensional Dissolution in N‑Methylformamide Unlocks Highly Ordered Hybrid Bragg-Stack Clay-Poly(Ethylene Glycol) Oxygen Barriers

  • Max Stevenson1,2
  • Alexandra Jourdain1,3
  • Felix Uhlig1
  • Sabine Rosenfeldt1,2
  • Meike Kuhn4
  • Eva M. Herzig4
  • Josef Breu1,2
4 affiliations
  1. 1Department of Chemistry, University of Bayreuth, Universitätsstraße 30, Bayreuth, Germany, 95447
  2. 2Bavarian Polymer Institute (BPI), University of Bayreuth, Universitätsstraße 30, Bayreuth, Germany, 95447
  3. 3Institut Lavoisier de Versailles, Université Paris-Saclay, 45 Avenue des États-Unis, Versailles, France, 78035
  4. 4Dynamics and Structure Formation – Herzig Group, University of Bayreuth, Universitätsstraße 30, Bayreuth, Germany, 95447
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Abstract

One-dimensional (1D) dissolution is a gentle and thermodynamically driven process that enables the spontaneous and utter delamination of layered materials into nematic suspensions of individual high aspect ratio nanosheets. This process is primarily known and extensively explored for aqueous systems. Examples of 1D dissolution in organic solvents are scarce and require selected organocations or complexation of the interlayer cation. This work demonstrates synergistic delamination of synthetic sodium fluorohectorite (NaHec; Na0.5inter [Li0.5Mg2.5]oct tet O10F2) in N-methylformamide (NMF) using poly (ethylene glycol) (PEG), which concomitantly acts as a complexing agent driving delamination and as the polymer matrix for a composite. Upon spray coating, the polymer is directly incorporated into a highly ordered hybrid Bragg-stack nanocomposite. The performance as a gas barrier was investigated for a range of PEG chain lengths [MW = 200, 400, 1500, 10000 g mol-1] using O2‑transmission rate measurements. With increasing MW, substantially reduced oxygen permeabilities (23°C, 75% r.h.) were observed, reaching values as low as 0.029 cm3 µm m‑2 d‑1 bar‑1, demonstrating the power of non-aqueous preparation of NaHec-PEG hybrid Bragg-stack nanocomposites.

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Cite

BibTeXRIS
BibTeX
@misc{stevenson2026polymerassisted,
  title = {{Polymer-Assisted One-Dimensional Dissolution in N‑Methylformamide Unlocks Highly Ordered Hybrid Bragg-Stack Clay-Poly(Ethylene Glycol) Oxygen Barriers}},
  author = {Max Stevenson and Alexandra Jourdain and Felix Uhlig and Sabine Rosenfeldt and Meike Kuhn and Eva M. Herzig and Josef Breu},
  howpublished = {ChemRxiv},
  year = {2026},
  month = sep,
  doi = {10.26434/chemrxiv.15009044/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009044/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Polymer-Assisted One-Dimensional Dissolution in N‑Methylformamide Unlocks Highly Ordered Hybrid Bragg-Stack Clay-Poly(Ethylene Glycol) Oxygen Barriers
AU  - Max Stevenson
AU  - Alexandra Jourdain
AU  - Felix Uhlig
AU  - Sabine Rosenfeldt
AU  - Meike Kuhn
AU  - Eva M. Herzig
AU  - Josef Breu
PY  - 2026
DA  - 2026/09/18
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15009044/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009044/v1
AB  - One-dimensional (1D) dissolution is a gentle and thermodynamically driven process that enables the spontaneous and utter delamination of layered materials into nematic suspensions of individual high aspect ratio nanosheets. This process is primarily known and extensively explored for aqueous systems. Examples of 1D dissolution in organic solvents are scarce and require selected organocations or complexation of the interlayer cation. This work demonstrates synergistic delamination of synthetic sodium fluorohectorite (NaHec; Na0.5inter [Li0.5Mg2.5]oct tet O10F2) in N-methylformamide (NMF) using poly (ethylene glycol) (PEG), which concomitantly acts as a complexing agent driving delamination and as the polymer matrix for a composite. Upon spray coating, the polymer is directly incorporated into a highly ordered hybrid Bragg-stack nanocomposite. The performance as a gas barrier was investigated for a range of PEG chain lengths [MW = 200, 400, 1500, 10000 g mol-1] using O2‑transmission rate measurements. With increasing MW, substantially reduced oxygen permeabilities (23°C, 75% r.h.) were observed, reaching values as low as 0.029 cm3 µm m‑2 d‑1 bar‑1, demonstrating the power of non-aqueous preparation of NaHec-PEG hybrid Bragg-stack nanocomposites.
ER  -