| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a porous body having an excellent heat resistance, a fine cellular structure and a low dielectric constant. SOLUTION: In a preparation process of a porous body, a component comprising a non-continuous phase is removed from a polymer composition having a micro phase separation structure wherein a non-continuous phase having an average diameter of smaller than 10μm is dispensed in a polymer continuous phase via at least one operation selected from evaporation and cracking and via extraction to yield a porous structure. Here, the component comprising the non-continuous phase has a weight average molecular weight of e.g. 10,000 or smaller. As a solvent to extract the component comprising the non-continuous phase, liquefied carbon dioxide, supercritical carbon dioxide, or the like, may be used.</p> |
