Development of Polyimide Polymers membranes for Pervaporation and Vapor-Permeation of Hydrocarbon Mixtures.

由于磷酸基对芳烃的亲和力，磷酸化聚酰胺的交联膜对芳烃/非芳烃混合物具有更高的溶解度选择性，因此与碱性聚酰胺及其同系物膜相比，磷酸化聚酰胺的交联膜对芳烃/非芳烃混合物具有更高的渗透汽化性能和优异的耐久性。以噻吩-2,3,7,8-四羧酸二酐- 5,5,10 -四氧化物和二胺为原料合成了聚酰胺，并对其PV性能进行了研究。以2,2′-二乙基联苯胺为原料合成了共聚亚胺。基于乙基的交联由于增加了扩散选择性而提高了PV性能。四氰乙烯的加入对PV性能的改善也很有效。以聚酰亚胺和聚吡罗酮膜为原料，在500-700℃的温度下，在N2中热解制备碳分子筛膜。它们在丙烯/丙烷等气体分离方面表现出高性能。以多孔高密度聚乙烯薄膜为衬底，制备了聚甲基丙烯酸缩水甘油酯接枝膜。在温和聚合条件下，双侧均质等离子体处理制备的膜显示出最高的PV性能。

The crosslinked membranes of the phosphorylated polymides displayd higher pervaporation (PV) performance with excellent durability toward aromatic/non-aromatic hydrocarbon mixtures, compared with the base polymide and its homolog membranes, because of the higher solubility selectivity due to affinity of the phosphonate groups to the aromatic hydrocarbons.Polymides from thianthrene-2,3,7,8-tetracarboxylic dianhydride-5,5-10,10-tetraoxide and diamines were synthesized and the investigation of their PV properties are in progress. Copolyimides from 2,2'-diethynylbenzidine were synthesized. The crosslinking based on the ethynyl groups enhanced the PV performance due to the increased diffusivity selectivity. The addition of tetracyanoethylene was also effective for the improvement of the PV performance.Carbon molecular sieve membranes wer prepared by pyrolyzing polyimide and polypyrrolone membranes at 500-700 ﾟC in N2. They displayd high performance for gas separation such as propylene/propane.Poly (glycidyl methacrylate) grafted membranes were prepared using porous high density polyethylene films as substrate. The membranes prepared by the homogeneous both-side plasma treatment and under the mild polymerization conditions displayd the highest PV performance.