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首页> 外文期刊>Journal of Applied Polymer Science >Polymeric homogeneous composite membranes for separations in organic solvents
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Polymeric homogeneous composite membranes for separations in organic solvents

机译：用于有机溶剂分离的聚合物均质复合膜

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A new generation of organic solvent nanofiltration (NF) composite membranes was prepared combining a support layer with a selective layer made both from the same polymeric material (P84 copolyimide). These membranes, homogeneous in composition, but composite in structure, were defined as polymeric homogeneous composite (PHC) membranes. The composite membranes have the advantage over the asymmetric ones that each layer can be optimized independently. Moreover, the use of the same material for the preparation of both, the selective and the support layer, ensures a high affinity between the two layers and increases the long-term stability of the composite membranes, reducing the possibility of delamination phenomena. In the design of the PHC membranes, a great attention was devoted to the support layer development. The effects of the composition of the casting solutions on the structure of porous P84 copolyimide membranes were investigated allowing to identify the conditions for the preparation of highly permeable, chemically, and mechanically stable P84 sponge like porous membranes. PHC membranes were prepared by coating and controlled solvent evaporation of a P84 solution on the optimized support crosslinked by reaction with a diamine (1,5-diamino-2-methylpentane). Pure solvent permeation test and rejection experiments were carried out on the P84 supports and the corresponding PHC membranes in aggressive organic solvents like N-methyl-2-pyrrolidone and N,N-dimethyformamide, in which the original polymer was soluble. The PHC membrane resulted completely stable over long times (>96 h).
机译：制备了新一代有机溶剂纳米过滤（NF）复合膜，该膜将支撑层与选择层结合在一起，而选择层均由相同的聚合材料（P84共聚酰亚胺）制成。这些膜在组成上是均质的，但在结构上是复合的，被定义为聚合物均质复合（PHC）膜。与非对称膜相比，复合膜的优势在于每一层都可以独立优化。而且，使用相同的材​​料来制备选择性层和支撑层两者，确保了两层之间的高亲和力，并增加了复合膜的长期稳定性，从而减少了分层现象的可能性。在PHC膜的设计中，对支撑层的开发给予了极大的关注。研究了浇铸溶液的组成对多孔P84共聚酰亚胺膜结构的影响，从而可以确定制备高渗透性，化学和机械稳定的P84海绵状多孔膜的条件。通过将P84溶液涂覆并控制溶剂蒸发，将其与二胺（1，5-二氨基-2-甲基戊烷）交联，从而在最佳载体上涂覆和控制溶剂蒸发，从而制备出PHC膜。在侵蚀性有机溶剂（例如N-甲基-2-吡咯烷酮和N，N-二甲基甲酰胺）中，对P84载体和相应的PHC膜进行了纯溶剂渗透测试和排除实验，原始聚合物可溶于其中。 PHC膜在长时间（> 96小时）内完全稳定。

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