几种HQDEA型聚醚酰亚胺的透气性能

Gas Permeability and Permselectivity of a Series of HQDEA-Based Polyetherimide Membranes

合成了四种双醚二酐(HQDEA)型聚醚酰亚胺,研究了它们对H_2、CO_2、O_2、N_2和CH_4五种气体的透过性能。结果表明,这类聚醚酰亚胺的分子结构,特别是取代基的位置对透气性和透气选择性有很大的影响。酰亚胺键邻位甲基取代聚醚酰亚胺(HQDEA-DMMDAI)兼具有高的透气性和透气选择性。

The permeability coefficients of four different HQDEA - based polyetherimide membranes to H2, CO2. O2, N2 and CH4 have been measured at temperatures from ambient to 150C. Variations in chemical structure were found to lead to significant changes in permeability and permselectivity of polyetherimide membranes. Among the four polyetherimides, HQDEA -DMMDAI with larger free volume and lower intrasegmental mobility has higher permeability and higher permselectivity. H2 Permeability coefficient, H2/CH4 and H2/N2 permselectivity coefficients of HQDEA -DMMDAI at 30'C are 7. 83 barrer, 375, and 219, respectively, and it is very good membrane material for H2/CH4 and H2/N2 separation.