Effects of Polyvinyl Alcohol(PVA) Content on the Microstructures of Unsupported Alumina Membranes

Abstract

Abstract: Polyvinyl Alcohol(PVA) can prevent the microcrack of the sol-gel-derived alumina membranes from
occurring during the drying process, and at the same time has effects on the microstructures of the membranes. In the present paper, the crystalline
phase, thermal stability, specific surface area, pore size distribution and pore surface fractal of alumina membranes doped with PVA were
characterized by XRD,DTA,DGA, FT-IR and BET. The results show that PVA is completely removed after calcination at 400℃. The N₂ adsorbed
amount of PVA-doped alumina membranes is greater than that of pure membranes, but doesn’t increase in proportion to PVA content. The
PVA-doped alumina membranes have a sharper pore size distribution, higher pore volume and lower pore surface fractal dimension.

Key words: polyvinyl alcohol, alumina membrane, specific surface area, pore size distribution, fractal dimension

CLC Number:

O484

WEI Qi,WANG Da-Wei,ZHANG Shu-Gen. Effects of Polyvinyl Alcohol(PVA) Content on the Microstructures of Unsupported Alumina Membranes[J]. Journal of Inorganic Materials.

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Effects of Polyvinyl Alcohol(PVA) Content on the Microstructures of Unsupported Alumina Membranes

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