Polyimide Ultrafiltration Membranes with High Thermal Stability and Chemical Durability
Polyimide Ultrafiltration Membranes with High Thermal Stability and Chemical Durability
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DOI：
10.1080/01496390903256166
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发表时间：
2009-01-01
影响因子：
2.8
通讯作者：
Cherkasov, A. N.
中科院分区：
文献类型：
--
作者：
Polotskaya, G. A.;Meleshko, T. K.;Cherkasov, A. N.
基于聚[(4,4'-氧二亚苯基)均苯四酰亚胺]的不对称超滤膜通过湿法由预聚物浇铸溶液制备，然后在200℃下将预聚物膜固相转化为聚酰亚胺不溶形式。结果表明，通过在浇铸溶液中添加苯并咪唑并在热处理之前用惰性高沸点油填充预聚物膜孔，可以制备不对称多孔聚酰亚胺膜。所得膜的主要特性（渗透系数和截留分子量）与超滤膜的典型特性相匹配。结果发现，所开发的不对称超滤聚酰亚胺膜具有优异的耐热性和耐化学性。该膜在 Tg（360 摄氏度）以上保持刚性，并且在高达 400 摄氏度的温度下具有化学稳定性。开发的膜在侵蚀性有机介质（包括酰胺溶剂）中能够抵抗膨胀和溶解。
Asymmetric ultrafiltration membranes based on poly[(4,4'-oxydiphenylene)pyromelliteimide] were produced by wet technique from prepolymer casting solution, followed by solid-phase conversion of the prepolymer membranes into polyimide insoluble form at 200 degrees C. It was demonstrated that by adding benzimidazole to the casting solution and filling of prepolymer membrane pores with inert high-boiling oil prior to thermal treatment allow us to prepare asymmetric porous polyimide membranes. The main characteristics of the membranes obtained (permeability coefficients and molecular weight cut-off) match those typical to ultrafiltration membranes. It was found that the developed asymmetric ultrafiltration polyimide membranes have excellent thermal and chemical resistance. The membranes retain rigidity above Tg (360 degrees C) and are chemically stable at temperatures up to 400 degrees C. The developed membranes are resistant against swelling and dissolving in aggressive and organic media including amide solvents.