通过两步法制备了一种均苯型聚酰亚胺耐溶剂纳滤膜，重点研究了热亚胺化进程对膜性能的影响。选用热亚胺化程序为200℃保持2.5h，250℃保持2h，300℃保持2h的工艺制备了性能较为优异的均苯型聚酰亚胺耐溶剂纳滤膜。测试结果表明耐溶剂纳滤膜在大部分测试溶剂中有较好的稳定性，膜的几种纯溶剂通量均保持较高水平的同时对结晶紫和依来络蓝黑R水溶液的截留率分别达到99.8%和97.9%。

This paper describes the preparation of polyimide (pyromellitic dianhydride-4,4'-oxydianiline) solvent resistance nanofiltration membrane by two-step method. In this research the thermal imidization procedure were studied.  The SRNF membranes with better performance were prepared at the following procedures: 200oC for 2.5h, 250oC for 2h, and 300oC for 2h in vacuum environment.The membrane was stable in most of the solvents tested. The fluxes of some common solvents keep a relatively high level while the rejection of Crystal violet and Eriochrome blue black R were up to 99.8% and 97.9% respectively.

[1] Pieter Vandezande, Lieven E. M. Gevers and Ivo F. J. Vankelecom, Solvent resistant nanofiltration: separating on a molecular level. Chem. Soc. Rev, 2008, 37, 365-405.
[2] K. Boussu, C. Vandecasteele, B. Van der Bruggen, Study of the characteristics and the performance of self-made nanoporous polyethersulfone membranes, Polymer, 2006, 47, 3464-3476.
[3] J. Wang , Z. Yue, J. S. Ince, J. Economy, Preparation of nanofiltration membranes from polyacrylonitrile ultrafiltration membranes, J. Membr. Sci., 2006 286, 333–341.
[4] I.C. Kim, K.H. Lee, Tae-Moon Tak, Preparation and characterization of integrally skinned uncharged polyetherimide asymmetric nanofiltration membrane, J. Membr. Sci., 2001, 183, 235-247.
[5] C. R. Dias, M. J. Rosa, Maria Norberta de Pinho, Structure of water in asymmetric cellulose ester membranes - an ATR-FTIR study, J. Membr. Sci., 1998, 138, 259-267.
[6] Pieter Vandezande, Xianfeng Li, Lieven E.M. Gevers, Ivo F.J. Vankelecom, High throughput study of phase inversion parameters for polyimide-based SRNF membranes. J. Membr. Sci., 2009, 330, 307-318.
 [7] A.F. Ismail, L.P. Yean, Review on the development of defect-free and ultra-thin skinned asymmetric membranes for gas separation through manipulation of phase inversion and rheological parameters, J. Appl. Polym. Sci., 2003, 88, 442.
 [8] I. Pinnau, W.J. Koros, A qualitative skin layer formation mechanism for membranes made by dry/wet phase inversion, J. Polym. Sci., Part B: Polym. Phys., 1993, 31, 419.