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 were synthesized through a tertiary growth method. Its perfection significantly depends on the adopted seed and itself poly-crystalline structure. Amorphous seed synthesized at a low crystallization tempera-ture (393 K), obviously favors producing the perfective TAPO-5 membrane. TAPO-5 crystal seed, however, induces the growth of its membrane with a larger extent of cracks (i.e., grain boundary defect), destructing itself perfection. Those diverse results are associated with the disparate seeds layers deposited by a spreading-wetting method, and consistently demonstrated by SEM, XRD, and single gas (He) permeation test. A typical feature of the amorphous TAPO-5 seed layer is its dispersive distribution pattern in the macro holes of support. A continuous layer, however, is observed for the TAPO-5 crystal seed layer. The amorphous seed is explained as a prior seed for the perfective TAPO-5 membrane.
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