Chang Yawen, Wang Zijia, Liu Fujuan
National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, 199 Ren-Ai Road, Suzhou 215123, China.
Molecules. 2025 Sep 15;30(18):3750. doi: 10.3390/molecules30183750.
In recent years, membrane separation technology has undergone continuous advancements. Microfiltration (MF) membranes, as an important type, are usually prepared by electrospinning-a simple and efficient method. This study reports the development of crosslinked polyvinyl alcohol/polyethylene glycol (cPVA/PEG) nanofiber membranes through a combination of electrospinning and chemical crosslinking, investigating the effects of different crosslinking concentrations on the membrane morphology, surface wettability, and tensile properties. Comprehensive characterization was carried out by using scanning electron microscopy (SEM), a Fourier-transform infrared spectrometer (FTIR), an X-ray diffractometer (XRD), a thermogravimetric (TG) analyzer, differential scanning calorimetry (DSC), a contact angle tester, a universal testing machine, etc. The results showed that at the crosslinking concentration of 15%, the cPVA/PEG fiber membrane achieved a breaking stress of 29.07 ± 2.60 MPa, a breaking strain of 77.60 ± 6.02%, and a porosity exceeding 43%. SEM, FTIR, XRD, TG, and DSC analyses collectively confirmed the occurrence of chemical crosslinking within the membrane structure. The cPVA/PEG-15 membrane exhibited no observable shrinkage or curling upon water contact, combined with excellent hydrophilicity and lipophilicity in the air. These properties indicate that the membrane can serve as a novel functional membrane substrate (e.g., as hydrophilic separation layers) and is expected to play an important role in fields such as seawater desalination and wastewater treatment, demonstrating significant application potential.
近年来，膜分离技术不断发展。微滤（MF）膜作为一种重要类型，通常通过静电纺丝这种简单高效的方法制备。本研究报告了通过静电纺丝和化学交联相结合的方式制备交联聚乙烯醇/聚乙二醇（cPVA/PEG）纳米纤维膜，研究了不同交联浓度对膜形态、表面润湿性和拉伸性能的影响。使用扫描电子显微镜（SEM）、傅里叶变换红外光谱仪（FTIR）、X射线衍射仪（XRD）、热重（TG）分析仪、差示扫描量热法（DSC）、接触角测试仪、万能试验机等进行了全面表征。结果表明，在交联浓度为15%时，cPVA/PEG纤维膜的断裂应力为29.07±2.60 MPa，断裂应变率为77.60±6.02%，孔隙率超过43%。SEM、FTIR、XRD、TG和DSC分析共同证实了膜结构内发生了化学交联。cPVA/PEG - 15膜在与水接触时没有明显的收缩或卷曲现象，在空气中具有优异的亲水性和疏油性。这些特性表明该膜可作为一种新型功能膜基材（例如作为亲水分离层），有望在海水淡化和废水处理等领域发挥重要作用，展现出显著的应用潜力。
