Rapid Fabrication of Porous Amphiphilic Polyamides via Non-conventional Evaporation Induced Phase Separation

Abstract

In the present work, we report a facile approach to fabricate porous long-chain polyamides (LCPAs) through a non-conventional evaporation induced phase separation. Taking advantage of their amphiphilic nature, LCPAs can be dissolved by a mixture of a polar and a non-polar solvent. The sequential evaporation of solvents leads to the rapid formation of homogeneous pores within 1 minute. Also, it demonstrates that this approach can be applied to other long-chain polycondensates. Our finding provides a new insight to the rapid and coagulating-bath-free fabrication of porous materials.

Macroporous fibers electrospun from dual‐good solvent system

“…[1][2][3] Liquid-liquid phase separation techniques are commonly adopted in fabrication of porous polymeric materials, especially porous membranes. [4][5][6][7] In these techniques, the polymer solutions are demixed into polymer-rich phases and solvent-rich phases, which then leave the polymer skeleton and pores, respectively, after solidification. The liquid-liquid phase separation is primarily divided into three categories based on the mechanisms: nonsolvent-induced phase separation (NIPS), thermally-induced phase separation (TIPS), and vaporinduced phase separation (VIPS).…”