聚乙烯醇(PVA)能够避免溶胶-凝胶法制备的A12O3膜在干燥阶段产生微裂纹，同时也对A12O3膜的微观结构产生影响。利用XRD、DTA、TGA、FT-IR及N2吸附等手段研究掺杂PVA对A12O3膜的物相组成、热稳定性以及比表面积、孔径分布、孔表面分形性等微观结构的影响。研究表明，经过400℃煅烧PVA完全排除。与纯A12O3膜相比，添加PVA的A12O3膜吸附量较大，比表面积有所增大，但并不随着PVA含量的增多而增加。PVA有利于A12O3膜孔径的调整，使孔径分布更狭窄，孔体积也有较大程度的增加。随着PVA的加入，A12O3膜的孔表面分形维数降低。
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.
参考文献
| [1] | Okubo T, Watanabe M, Kusakabe K, et al. J. Mater. Sci, 1990, 25: 4822-4827. |
| [2] | Naif B N, Yamaguchi T, Okubo T, et al. J. Membr. Sci, 1997, 135: 237-245. |
| [3] | Kumar K N P, Keizer K, Burggraaf A J, et al. J. Meter. Chem, 1993, 3: 923-929. |
| [4] | Sheng G, Chu L, Zeltner W A, et al. J. Non-Crystal Solids, 1992, 147-148: 548-553. |
| [5] | Zeng Z, Xiao X, Gui Z, et al. J. Membr. Sci, 1997, 136: 153-159. |
| [6] | Yang W P, Shyu S S, Lee E S, et al. Sep. Sci. Technol, 1996, 31: 1327-1343. |
| [7] | Pfeifer P, Avnir D. J. Chem. Phy, 1983, 79, 3558-3571. |
| [8] | Avnir D, Farin D, Pfeifer P. J. Chem. Phys, 1983, 79: 3566-3576. |
| [9] | Avnir D, Farin D, Pfeifer P. Nature, 1984, 308: 261-269. |
| [10] | Bale D H, Schmidt P W. Phys.Rev. Left, 1984, 53: 596-603. |
| [11] | Friel J J, Pande C S. J. Mater. Res, 1993, 8: 100-112. |
| [12] | Hoinkis E, Auen J A. J. Colloid Interface Sci, 1991, 142: 540-549. |
| [13] | Ismail I M K, Pfeifer P. Langmuir, 1994, 10: 1532-1538. |
| [14] | Rubio F, Rubio J, Oteo J L. J. Sol-Gel Sci. Technol, 1997, 8: 159-163. |
| [15] | Avnir D, Jaroniec M. Langmuir, 1989, 5: 1431-1438. |
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