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首页> 外文期刊>Journal of Applied Polymer Science >THE EFFECTS OF SPINNING CONDITIONS ON ASYMMETRIC 6FDA/6FDAM POLYIMIDE HOLLOW FIBERS FOR AIR SEPARATION
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THE EFFECTS OF SPINNING CONDITIONS ON ASYMMETRIC 6FDA/6FDAM POLYIMIDE HOLLOW FIBERS FOR AIR SEPARATION

机译：纺丝条件对不对称6FDA / 6FDAM聚酰亚胺中空纤维的影响

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摘要

We have found that the chemistries of inner and external coagulants, gelation bath temperature, and air gap distance have profound effects on 6FDA-polyimde hollow-fiber morphology and performance. This 6FDA-polyimide is made of 50 mol % 2,2'-bis(3,4'-dicarboxyphenyl) hexafluoro propane dianhydride (6FDA) and 50 mol % 2,2'-bis(S-aminophenyl)hexafluoro propane (4,4' GF-diamine)(6FDAM). An increase in air gap distance tends to induce three-dimensional open-cell pore formation. Raising bath temperature has a similar effect. Multilayer finger-void structure can be completely eliminated if one properly chooses a bore-fluid flow rate and a gelation bath temperature. Experimental data demonstrate that the location of the dense layer can be shifted from the inner skin to the outer skin based on the chemistry (solubility parameter) of coagulants. The location of finger voids is also dependent on the chemistry of coagulants, and the dense layer location may shift from the inner surface to the external surface or appear in both surfaces dependent on the differences in solubility and coagulation rate. A defect-free 6FDA/6FDAM polyimide fiber with a selectivity of 4.73 and a permeance of 38.1 GPU is produced. (C) 1997 John Wiley & Sons, Inc. [References: 35]
机译：我们发现内部和外部凝结剂的化学性质，胶凝浴温度和气隙距离对6FDA-聚酰亚胺中空纤维的形态和性能都有深远的影响。该6FDA聚酰亚胺由50摩尔％2,2'-双（3,4'-二羧苯基）六氟丙烷二酐（6FDA）和50摩尔％2,2'-双（S-氨基苯基）六氟丙烷（4， 4'GF-二胺）（6FDAM）。气隙距离的增加趋向于引起三维开孔孔的形成。升高浴温具有类似的效果。如果适当选择孔道流体流速和胶凝浴温度，则多层指孔结构可以完全消除。实验数据表明，根据凝结剂的化学性质（溶解度参数），致密层的位置可以从内皮转移到外皮。手指空隙的位置还取决于凝结剂的化学性质，并且取决于溶解度和凝结速率的差异，致密层的位置可能会从内表面移动到外表面或出现在两个表面中。生产出具有4.73的选择性和38.1 GPU的渗透率的无缺陷的6FDA / 6FDAM聚酰亚胺纤维。 （C）1997 John Wiley＆Sons，Inc. [参考：35]

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