Crosslinked electrospun composite membranes of poly(vinyl alcohol) and poly(vinyl chloride): tunable mechanical properties, porosity and performance
Crosslinked electrospun composite membranes of poly(vinyl alcohol) and poly(vinyl chloride): tunable mechanical properties, porosity and performance
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DOI：
10.1002/pi.6224
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发表时间：
2021-03
影响因子：
3.2
通讯作者：
Husain Mithaiwala;Zachary Tronstad;M. M. Korah-M.;Alexander N. Buffington;M. Green
中科院分区：
文献类型：
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作者：
Husain Mithaiwala;Zachary Tronstad;M. M. Korah-M.;Alexander N. Buffington;M. Green
水资源管理已成为学术界和工业界科学家最迫切关注的问题之一。扩大对微咸水、海水和废水等非传统水原料的获取需要强大的预处理工艺，以延长反渗透处理工艺的使用寿命并提高其效率。在此，通过一个简单的和可扩展的技术，开发了具有可调的亲水特性和机械性能的预处理膜。具体地，将聚（乙烯醇）（PVA）和聚（氯乙烯）（PVC）以各种PVA与PVC质量比电纺丝，然后用聚（乙二醇）二酸交联。纤维的直径和形态，其特征在于使用扫描电子显微镜（SEM）;傅立叶变换红外光谱和共聚焦荧光显微镜进一步证实了这两种聚合物的存在。此外，建立了绘制PVA/PVC浓度的严格分析，以准确确定共纺垫上两种聚合物的相对浓度。如使用SEM所见，上述交联反应将膜孔隙率从500调整至80 nm，并且使用拉伸测试探测机械性能。数据显示，PVC含量控制机械强度;此外，较高的PVA含量预期通过增强亲水性来增加水渗透，但这些材料中较高的交联度实际上降低了水渗透。这项工作介绍了一种简便的，可扩展的路线，用于制造预处理膜的可调孔隙率，机械性能和水渗透行为。© 2021工业化学学会。
Managing water resources has become one of the most pressing concerns of scientists in both academia and industry. Broadening access to nontraditional water feedstocks, such as brackish water, seawater and wastewater, requires a robust pretreatment process to prolong the lifetime and improve the efficiency of reverse osmosis treatment processes. Herein, pretreatment membranes with tunable hydrophilic characteristics and mechanical properties were developed through a facile and scalable technique. Specifically, poly(vinyl alcohol) (PVA) and poly(vinyl chloride) (PVC) were electrospun at various PVA‐to‐PVC mass ratios and then crosslinked with a poly(ethylene glycol) diacid. Fiber diameters and morphologies were characterized using scanning electron microscopy (SEM); Fourier transform infrared spectroscopy and confocal fluorescence microscopy further confirmed the presence of both polymers. Moreover, a rigorous analysis to map the PVA/PVC concentration was established to accurately determine the relative concentrations of the two polymers on the co‐spun mat. The crosslinking reaction noted above tuned the membrane porosity from 500 to 80 nm, as seen using SEM, and the mechanical properties were probed using tensile testing. The data revealed that the PVC content controlled the mechanical strength; moreover, higher PVA contents were expected to increase water permeation by enhancing the hydrophilicity, but the higher degree of crosslinking in these materials actually reduced water permeation. This work introduces a facile, scalable route for the manufacture of pretreatment membranes with tunable porosity, mechanical properties and water permeation behavior. © 2021 Society of Industrial Chemistry.