Gas transport properties of asymmetric polyimide membrane with an ultrathin surface skin layer
Gas transport properties of asymmetric polyimide membrane with an ultrathin surface skin layer
复制标题
具有超薄表面皮层的不对称聚酰亚胺膜的气体传输性能
DOI：
10.1021/ma9803178
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发表时间：
1998
期刊：
影响因子：
5.5
通讯作者：
S. Nagaoka
中科院分区：
文献类型：
--
作者：
H. Kawakami;M. Mikawa;S. Nagaoka
在这里，提出了一种新的气体分离的可能性，使用非对称膜，与无缺陷和无缺陷的皮肤层。的结构的不对称膜，通过干/湿相转化过程中制备的，表现出一个cross-skin层和海绵状结构，其特征在于存在的大空隙。膜的气体选择性随着表面皮层厚度的减小而增加，这可能是因为具有较薄表面皮层的膜形成了更紧密的结构。讨论了膜表面皮层对气体渗透性和选择性的影响。
Here, a new possibility for gas separation is presented, using an asymmetric membrane, with an ultrathin and defect-free skin layer. The structure of the asymmetric membrane, prepared by a dry-/wet-phase inversion process, showed an ultrathin skin layer and spongelike structure characterized by the presence of macrovoids. The gas selectivity of the membrane increases with a decrease in the thickness of the surface skin layer, perhaps because the membrane with a thinner surface skin layer forms a more packed structure. The effect of the membrane's surface skin layer on gas permeability and selectivity is discussed.