| 초록 |
Porous polymeric materials have been widely used as critical components in environmental, electrical and medical applications. We fabricated novel porous structures via directional crystallization and photo cross-linking in repeated manners. The solution used in this directional crystallization was composed of dimethylsiloxane and benzene. First, a cross-linked, honeycomb-like structure was prepared by 1st directional crystallization of the solvent and subsequent photo cross-linking in freezer. In this structure, the solution was infiltrated and the 2nd directional crystallization and photo cross-linking were processed once more. Because of the 2nd directional crystallization, the structures and physical properties of the final porous materials turned out to be novel. The repeated directional crystallization resulted in increased hardness and modulus than those of the structure fabricated by single directional crystallization. On the other hand, porosity and contact angle became lower in the structure fabricated by repeated directional crystallization. |
