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疏水改性聚四氟乙烯（PTFE）中空纤维膜及其在醇水分离中的应用

作者：吴志超¹，刘娣²，华从贵²，吴明元¹，吴庆云¹，刘久逸¹，杨建军¹，张建安¹

单位： 1. 安徽大学化学化工学院，合肥 230601； 2. 安徽科纳诺膜科技有限公司，合肥 230088

关键词： PTFE中空纤维膜；疏水；醇水分离

DOI号： 10.16159/j.cnki.issn1007-8924.2025.04.013

分类号： TQ317.9

出版年,卷(期):页码： 2025,45(4):124-132

摘要：

过两步改性策略增强PTFE中空纤维膜的疏水性，以提高其在醇水分离中的性能。首先，利用支化聚乙烯亚胺（PEI）与戊二醛（GA）形成交联网络包覆在膜纤维上，随后通过硬脂酰氯（SC）接枝长碳链，降低膜的表面能并增加粗糙度。通过FTIR、XPS和SEM表征了改性前后膜的表面化学和形貌变化，并对改性前后水接触角、透气性和醇水分离性能等进行分析。结果表明，改性膜的水接触角从(118.8±0.5)°提升至(141.7±0.9)°，透气性保持良好。拉伸强度为53.86 MPa，断裂伸长率为90.7%，弹性模量为307.2 MPa，与原始膜的力学性能相比没有降低。在化学和物理清洗后，改性膜的性能保持稳定。醇水分离测试显示，改性膜的乙醇渗透通量为285.41 g/(m2·h)，分离因子为10.25，表明其具有优异的分离性能和耐久性。

In this study, the hydrophobicity of PTFE hollow fiber membranes was enhanced by a two-step modification strategy to improve their performance in ethanol-water separation. First, the membrane fibers were coated with a cross-linked network formed by branched polyethylenimide (PEI) and glutaraldehyde (GA), and then grafted with stearyl chloride (SC) to reduce the surface energy and increase the roughness of the membrane. The surface chemical and morphological changes of the modified membranes were characterized by FTIR, XPS and SEM, and the water contact angle (WCA), air permeability and ethanol-water separation performance were analyzed before and after modification. The results showed that the modified membrane exhibited the WCA increased from (118.8±0.5)° to (141.7±0.9)° and maintained good air permeability. The tensile strength was 53.86 MPa, the elongation at break was 90.7% and the elastic modulus was 307.2 MPa, which did not decrease compared with the mechanical properties of the original membrane. The properties of the modified membrane were stable after chemical and physical cleaning. The ethanol-water separation test showed that the ethanol permeation flux of the modified membrane was 285.41 g/(m2·h), and the separation factor was 10.25, which indicated that the modified membrane had excellent separation performance and durability.

基金项目：

安徽省留学人员创新重点项目（2019LCX006）；国家自然科学基金项目（51973001）

作者简介：

吴志超（1998-），男，安徽合肥人，硕士研究生，主要研究方向为高分子材料

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