Preparation of porous carbons from phase-inversion membranes was investigated as a control method of pore structure in carbon materials. The structure in carbon films was estimated by means of electron microscopy, mercury porosimetry, and gas-adsorption methods. When phase-inversion membranes of Kapton-type polyimide were carbonized, they maintained the film form and gave macroporous carbon films having high porosity. However, micro- and mesopore structures in the carbon films were not influenced by phase inversion in the polymer stage, and, thus, the macroporous carbons had a molecular sieve property similar to that of carbons prepared from nonporous polyimide films. A macroporous structure in cellulose membranes was similarly maintained through the carbonization step, but some of these were fractured or deformed owing to the large shrinkage. Polymer membranes have a capability as porous carbon precursors if they satisfy two requirements: solid-state carbonization and relatively high carbon yield. A composite membrane of a macroporous carbon with a dense carbon having an impervious ability was readily produced by shaping at the precursor stage. (C) 1995 John Wiley and Sons, Inc. [References: 17]
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机译：研究了用相转化膜制备多孔碳作为控制碳材料中孔结构的方法。碳膜的结构通过电子显微镜，水银孔隙率法和气体吸附法进行估算。当将Kapton型聚酰亚胺的相变膜碳化时，它们保持膜形式并得到具有高孔隙率的大孔碳膜。然而，碳膜中的微孔和中孔结构在聚合物阶段不受相转化的影响，因此，大孔碳具有与由无孔聚酰亚胺膜制备的碳相似的分子筛性质。在碳化步骤中，纤维素膜中的大孔结构得到了类似的维持，但是其中一些由于大的收缩而破裂或变形。如果满足以下两个要求，则聚合物膜具有作为多孔碳前体的能力：固态碳化和相对较高的碳收率。通过在前体阶段成型，容易制造大孔碳与具有不渗透能力的致密碳的复合膜。 （C）1995 John Wiley and Sons，Inc. [参考：17]
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