Ultrafiltration membranes were prepared from epoxidized polysulfone by the conventional phase separation procedure. For epoxidizing, the polymer was first lithiated and a reaction followed with glycidyl-4-oxohexylether providing an eight atomic spacer. The reaction of the epoxy group with N-containing substituents was performed heterogeneously using the ready membranes. The stability of the substituted membranes is visible by the fact that they are reacted under reflux conditions for 24 h. The reagents were trimethyl amine, diethylamine, n-butyl amine, and tauric acid. Thus, positively charged, negatively charged, and neutral membranes were obtained. The membranes were characterized via ultrafiltration using dextran solution as well as human albumin solutions. In addition, the streaming potential was measured in the presence and absence of the protein. By these measurements the obviously neutral membranes were surprisingly identified to be positively charged. This is related to subsequent reactions of the spacer-bonded epoxy groups with the amino groups. (C) 1995 John Wiley and Sons, Inc. [References: 16]
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机译：通过常规的相分离方法由环氧化聚砜制备超滤膜。为了进行环氧化，首先将聚合物锂化，然后与提供八个原子间隔基的缩水甘油基-4-氧己基醚进行反应。环氧基与含N取代基的反应是使用现成的膜异质进行的。通过在回流条件下反应24小时，可以看出被取代膜的稳定性。试剂是三甲胺，二乙胺，正丁胺和牛磺酸。因此，获得带正电，带负电和中性的膜。通过使用葡聚糖溶液以及人白蛋白溶液的超滤来表征膜。另外，在存在和不存在蛋白质的情况下测量了流动潜力。通过这些测量，令人惊讶地发现明显的中性膜带正电。这与间隔基结合的环氧基与氨基的后续反应有关。 （C）1995 John Wiley and Sons，Inc. [参考：16]
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