| abstract |
PURPOSE: To obtain a polymeric porous material having many uniformly dispersed cells having a specified diameter, separated from each other by films and interconnected to each other through the apertures in the films, having a large void volume and suited as a catalyst, an adsorbent, etc., by freezing a solution of a polymer other than cellulose and extracting the solvent from the product. n CONSTITUTION: A polymer except cellulose (e.g. chitosan or sodium alginate) is dissolved in a solvent (e.g. dil. hydrochloric acid or aqueous sodium hydroxide solution). The obtained polymer solution is frozen by cooling to a temperature lower than the solidification temperature of the polymer solution. The solvent is extracted or deprived of its solvency to obtain a polymeric porous material having many cells of a diameter ≥ about 2μm and separated from each other by films and interconnected to each other through the apertures in the films which separate the adjacent cells to form an interconnected structure. By controlling the temperature and time in freezing, the pore diameter can be controlled. n COPYRIGHT: (C)1990,JPO&Japio |