Abstract In this paper, we introduce a single-step process that incorporates an intermediate layer on a hollow fiber to enhance the final membrane performance after interfacial polymerization (IP). This intermediate layer is applied during hollow-fiber spinning by complexation of two oppositely charged polyelectrolytes. Specifically, in this study, we consider the IP coating process an experimental success for a membrane sample with a NaCl rejection >85%. The IP success rate is defined as the percentage of the samples with a NaCl rejection of >85% within a studied group. The purpose of the intermediate layer is to increase the success rate of IP on the inner surface of the hollow fibers, typically a challenging task due to the cylindrical shape of the fibers. After the application of IP, the pure water permeance and NaCl rejection of the nascent membranes were tested to determine the success rate of IP. The IP success rate was 86–100% for the hollow fibers (HF) with intermediate layer, significantly higher than the 29% success rate achieved for IP on the support without intermediate layer. This surface modification approach is simple, time-efficient, and effective without any need for post-IP optimization that opens up new avenues for further developments for IP based dense hollow fiber membranes.

中文翻译：

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通过一步添加中间层提高中空纤维界面聚合的成功率

摘要 在本文中，我们介绍了一种单步工艺，该工艺在中空纤维上加入中间层，以提高界面聚合 (IP) 后的最终膜性能。该中间层是在中空纤维纺丝过程中通过两种带相反电荷的聚电解质络合施加的。具体而言，在本研究中，我们认为 IP 涂层工艺对 NaCl 截留率 > 85% 的膜样品来说是一项实验成功。IP 成功率定义为研究组内 NaCl 排斥率 >85% 的样品百分比。中间层的目的是提高中空纤维内表面 IP 的成功率，由于纤维的圆柱形形状，这通常是一项具有挑战性的任务。申请IP后，测试了新生膜的纯水渗透性和 NaCl 截留率，以确定 IP 的成功率。具有中间层的中空纤维 (HF) 的 IP 成功率为 86-100%，显着高于无中间层的支撑物上 IP 的 29% 成功率。这种表面改性方法简单、省时且有效，无需进行 IP 后优化，为进一步开发基于 IP 的致密中空纤维膜开辟了新途径。