セルロース系中空繊維の画像解析による孔径分布の測定

抄録

Hollow fibers of cellulose acetate (CA) were prepared by the wet spinning method using 1-methyl-2-pyrrolidinone as a solvent. Various contents of poly (vinylpyrrolidone) (PVP) were mixed with CA and solvent. The PVP fraction was washed out during and after the spinning. CA films with thickness of 400μm were spread on a glass plate as reference materials. Cross sections of the hollow fibers were observed using scanning electron microscopy. The distributions of the pore sizes of the hollow fibers were estimated from the scanning electron micrographs using computer graphic analysis. It was found the the average size increases with increasing PVP content and the size distribution decreases with increasing PVP content. Melting and crystallization of water in the fibers and films were observed using differential scanning calorimetry (DSC). The DSC results were discussed in terms of the pore size distribution.