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Self-limiting selective phase separation of graphene oxide and polymer composite solution.

Feifan Chen¹, Lidan Wang¹, Kaiwen Li¹

¹MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, Hangzhou 310027, China.

|January 20, 2025

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Selective phase separation (SPS) in polymers is achieved using mobile two-dimensional graphene oxide (GO) confinement. This method creates novel heterogeneous nanostructures and flexible composite fibers.

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Phase separation is key for creating complex structures in materials and biological systems.
Spatial confinement significantly influences phase separation dynamics, especially in 2D environments.
Graphene oxide (GO) offers unique 2D confinement possibilities for material design.

Purpose of the Study:

To investigate selective phase separation (SPS) of polymers within mobile 2D confinement provided by graphene oxide (GO) sheets.
To understand the quantitative relationships governing polymer phase formation under GO confinement.
To demonstrate the utility of SPS for fabricating advanced graphene composite materials.

Main Methods:

Inducing SPS in homogeneous GO-polymer solutions using poor solvents.

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Utilizing mobile 2D confinement from GO sheets to direct polymer migration and phase formation.

Employing SPS wet-spinning for the fabrication of heterogeneous composite fibers.

Main Results:

GO sheets create self-limiting 2D confinement, guiding polymer migration into distinct phases.
Quantitative rules correlating solvent properties and solute composition with polymer phase size and continuity were established.
Facile generation of heterogeneous nanostructures in GO/polymer composites was achieved.
Fabrication of radial heterogeneous fibrous graphene composite fibers with enhanced mechanical properties (ultrahigh elongation at break, superior flexibility) via SPS wet-spinning.

Conclusions:

Mobile 2D confinement by GO sheets enables controlled SPS of polymers.
This SPS approach provides a versatile method for designing 2D heterogeneous nanostructured materials.
The findings open new avenues for creating advanced materials with tailored properties through controlled phase separation.