Core-Shell Double Gyroids Directed by Selective Solvation for ABC Triblock Terpolymers.

Area of Science:

• Polymer Science
• Materials Science
• Nanotechnology

Background:

• Fabricating complex nanostructures like core-shell double gyroids from ABC triblock terpolymers via solution casting presents significant challenges.
• Understanding the interplay of polymer solubility and processing conditions is crucial for controlling self-assembly.

Purpose of the Study:

• To develop an efficient solution casting method for fabricating core-shell double gyroid network structures using specific ABC triblock terpolymers.
• To investigate the influence of molecular weight on the resulting nanostructure periodicity.

Main Methods:

• Solution casting of poly(2,2,2-trifluoroethyl methacrylate) (PTFEMA) (F)-b-[poly(4-vinylpyridine) (P4VP) (P)]-b-[polystyrene (PS) (S)] (FPS) triblock terpolymers in N,N-dimethylformamide (DMF).
• Heat treatment to induce microphase separation and structure formation.
• Systematic variation of polystyrene block molecular weights.

Main Results:

• Successfully fabricated core-shell double gyroid network structures with F as the matrix, P as the shell, and S as the core.
• Observed an increase in periodic lengths (110.8 to 162.7 nm) with increasing PS molecular weights (13.8 to 28.8 kg mol⁻¹).
• Demonstrated that solvent selection based on component solubility is key to achieving the desired gyroid structure.

Conclusions:

• The study presents a viable solvent selection strategy for fabricating core-shell double gyroid structures from ABC triblock terpolymers.
• This method provides an efficient route for creating complex nanonetworks with tunable periodicity.
• The findings are broadly applicable to various ABC triblock terpolymers, advancing the field of nanostructure fabrication.