A Novel Approach Based on Polymerization-Induced Phase Separation to Prepare Carbon Monolith with Oriented Flat Porous Structure

Abstract

A novel approach has been developed to fabricate an oriented flat porous carbon (OFPC) by combining the polymerizationinduced phase separation and pyrolysis (PIPSP) and the directional compressive deformation (DCD). At first, an elastic body in the shape of cylinder is obtained by controlling the polymerization degree of resin, and then the application of symmetrical axial pressures results in the directional deformation of two interconnected phases (of a polymerized resin phase and a poreforming agent phase) in the elastic body. Then the elastic deformed body is transformed to the rigid deformed body by precuring and further to the cured body by curing. At last, the cured body is pyrolyzed to form an OFPC. The pressures are removed after precuring. The pores in the OFPC are survived as the discs in the radial direction. Both flat pores and carbon skeletons in the OFPC are oriented toward a radial direction. The OFPC has comparable pore volume with a normal porous carbon, which is fabricated by the PIPSP with same process except for the application of the DCD.

Fabrication of 3D Hierarchically Porous Chitosan Monoliths by Thermally Induced Phase Separation of Chemically Modified Chitin

“…This makes them highly efficient functional materials for a wide range of applications, including highly efficient separation, ion exchange, catalysis, photocatalysis, adsorption, energy conversion and storage, as well as biomedicine . Several methods have been reported to fabricate polymer monoliths, including cross-linking, free radical polymerization, − and thin-layer membrane fabrication . In most cases, these approaches consist of complicated steps that can only be implemented at a small scale.…”