双醚二酐型聚醚酰亚胺的分子结构与透气性能

STRUCTURE/PERMEABILITY RALATIONSHIPS OF HQDEA-BASEDROLYEHERIMIDE MEMBRANES

合成了一系列单环芳二胺型聚醚酰亚胺，研究了它们对Ｈ＿２、Ｏ＿２和Ｎ＿２３种气体的透过性能。这类双醚二酐（ＨＱＤＥＡ）型聚醚酰亚胺的分子结构对其透气性和透气选择性有很大的影响，随着二胺单体分子中甲基的增多，聚醚酰亚胺的透气性增大，透气选择性减小；由３，５－二氨基苯甲酸合成的ＨＱＤＥＡ－ＤＡＢ具有较高的透Ｈ＿２系数和很高的Ｈ２／Ｎ＿２分离系数。

A series of HQDEA based polyetherimides from 1, 3 phenyldiamine derivatives were prepored by a conventional procedure, gas permeabilities and permselectivities for gas pairs H_2/N_2 and O_2/N_2 through five polymers above have been measured at the temperature from ambient up to 150℃. From HQDEA-PDA through HQDEA-TDA and HQDEA XDA to HQDEA-3MPDA. The permeabilities are progressively increased the permselectivities are progressively decreased acompanied increase in free volume. HQDEA-3MPDA with higher permeability and permselectivity for O_2/N_2, is a favorable O_2/N_2 separation menbrane material, and HQDEA-DAB with favorable H_2/N_2 seporation property is very useful to racover hydrapen from verious gas mixture by membrane method.