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

与基础聚酰亚胺及其同系物膜相比，磷酸化聚酰亚胺的交联膜显示出更高的渗透蒸发（PV）性能，对芳族/非芳族烃混合物具有优异的耐久性，这是因为膦酸酯基团对芳族烃的亲和力导致的更高的溶解度选择性。合成了10-四氧化物和二胺，并对其PV性能进行了研究。以2，2 '-二乙炔基联苯胺为原料合成了聚酰亚胺。基于乙炔基的交联由于增加的扩散选择性而增强PV性能。四氰基乙烯的加入对提高PV性能也是有效的。在500-700 ℃的N2气氛中，通过热解聚酰亚胺和聚吡咯酮膜制备了碳分子筛膜。以高密度聚乙烯（HDPE）多孔膜为基材，制备了聚甲基丙烯酸缩水甘油酯（PMMA）接枝膜。在温和的聚合条件下，采用均相等离子体处理制备的膜具有最高的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.