Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath,Journal of Applied Polymer Science

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Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2019-10-15 , DOI: 10.1002/app.48583
Reihaneh Cheraghali ₁ , Zahra Maghsoud ₁

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Conventional hydrolysis modification of polyacrylonitrile (PAN) membranes is usually carried out in a post‐treatment step during which hydrophilic groups are created on the membrane surface. In this article, however, direct hydrolysis in the immersion bath is proposed as a new and simple approach for simultaneous membrane preparation and modification. The main advantages of this method include lower alkali concentrations, promptness, and the lack of need for elevating temperature compared to other studies. The cast films were immersed in the coagulation bath containing aqueous NaOH solutions of various concentrations (0.003, 0.0125, 0.025, 0.05, and 0.1 M) for 1, 3, 5, and 10 min, which were then transferred to a bath of pure water. Membranes were characterized by pure water flux, porosity, average pore diameter, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, mechanical properties, rejection, and flux recovery ratio (FRR) measurements. At all treatment times, the pure water flux of modified membranes reached its maximum at low NaOH concentrations with a substantial increase (210%) in the membrane treated with 0.0125 M NaOH for 1 min. Furthermore, the kinetics of the hydrolysis reaction was considered to provide deeper insights into morphological changes occurring during the hydrolysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48583.

中文翻译：

在浸浴中直接水解增强聚丙烯腈超滤膜的改性技术

聚丙烯腈（PAN）膜的常规水解改性通常是在后处理步骤中进行的，在该步骤中会在膜表面形成亲水基团。然而，在本文中，提出了在浸浴中直接水解是同时进行膜制备和改性的一种新的简单方法。与其他研究相比，该方法的主要优点包括较低的碱浓度，快速度和无需升高温度。将流延膜浸入含有各种浓度（0.003、0.0125、0.025、0.05和0.1 M）的NaOH水溶液的混凝浴中1、3、5和10分钟，然后将其转移到纯水浴中。膜的特征在于纯净水通量，孔隙率，平均孔径，傅里叶变换红外光谱（FTIR），扫描电子显微镜（SEM），原子力显微镜（AFM），接触角，机械性能，截留率和通量回收率（FRR）测量。在所有处理时间，改性膜的纯净水通量在低NaOH浓度下均达到最大值，而用0.0125 M NaOH处理1分钟的膜则大幅增加（210％）。此外，认为水解反应的动力学提供了对水解过程中发生的形态变化的更深入的了解。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学改性膜的纯水通量在低NaOH浓度下达到最大值，而用0.0125 M NaOH处理1分钟的膜的纯水通量显着增加（210％）。此外，认为水解反应的动力学提供了对水解过程中发生的形态变化的更深入的了解。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学改性膜的纯水通量在低NaOH浓度下达到最大值，而用0.0125 M NaOH处理1分钟的膜的纯水通量显着增加（210％）。此外，认为水解反应的动力学提供了对水解过程中发生的形态变化的更深入的了解。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2020，137，48583。

更新日期：2020-01-21

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