论文部分内容阅读
TAPO-5膜可以通过三次生长法制备。它的完备性与所用晶种以及膜的多晶结构密切相关。393 K下晶化所得无定形晶种有利于引导制备完备性TAPO-5膜。然而,晶态TAPO-5晶种引导制备的TAPO-5膜存在大量的裂纹(即晶界缺陷),这破坏了膜的完备性。这些不同结果可以通过SEM、XRD和单组分气体渗透(He)测试进行说明。它与铺展润湿法所形成的晶种层的不同形式有关。无定形晶种层的典型特征是晶种分散于载体的大孔缺陷中。然而,晶态TAPO-5将以连续晶种层的形式存在。因此,无定形晶种更适合引导制备完备性TAPO-5膜。
TAPO-5 membranes can be prepared by three growth methods. Its completeness is closely related to the seed crystal used and the polycrystalline structure of the film. Crystallization of the obtained amorphous seed at 393 K facilitates the preparation of a complete TAPO-5 membrane. However, the crystalline TAPO-5 seeds led to a large number of cracks (ie, grain boundary defects) in the prepared TAPO-5 film, which undermined the completeness of the film. These different results can be demonstrated by SEM, XRD, and one-component gas permeation (He) tests. It is related to the different forms of seed layer formed by the spreading wetting method. A typical feature of amorphous seed layers is the dispersion of seed crystals in the macropore defects of the support. However, crystalline TAPO-5 will exist as a continuous seed layer. Therefore, amorphous seeds are more suitable for guiding the preparation of complete TAPO-5 membranes.