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芳香叔胺功能化聚丙烯中空纤维膜的制备与研究

作者：李浩¹，杨景皓¹，张世韬²，刘衡²，李明远¹，蔡正国¹，陈龙¹，孙俊芬¹

单位： 1. 东华大学先进纤维材料全国重点实验室, 材料科学与工程学院，上海 201620； 2. 湖北博韬合纤股份有限公司，荆门 448002

关键词：本体改性；亲水改性；聚丙烯中空纤维膜；芳香叔胺

DOI号： 10.16159/j.cnki.issn1007-8924.2025.02.003

分类号： TQ028

出版年,卷(期):页码： 2025,45(2):20-29

摘要：

本研究通过本体改性的策略，将芳香叔胺基团引入聚丙烯(PP)，合成了芳香叔胺基团含量（摩尔分数）为2%、2.5%、3.3%的聚丙烯共聚物PP[N(hexenol)]Ph2（PPPH），制备了具有亲水性能的PPPH中空纤维膜。采用核磁共振氢谱（NMR）、傅里叶变换红外光谱（FTIR）及扫描电子显微镜（SEM）对膜的化学结构与表面形貌进行了详尽表征；同时，利用热重分析（TGA）、接触角测量及力学性能测试对膜的综合性能进行了系统评估。结果表明，芳香叔胺基团的引入提高了PP中空纤维膜的亲水性能及热稳定性能。当芳香叔胺基团的含量为3.3%时，水接触角降低到76°，PPPH中空纤维膜的热分解温度提升至450 ℃，PPPH中空纤维膜的孔径为125 nm，孔隙率为38.7 %，断裂强度为65.0 MPa，断裂伸长率为433.0%。改性后的中空纤维膜的纯水通量达到了385.0 L/(m2·h），是PP中空纤维膜纯水通量的1.6倍。此外，PPPH中空纤维膜在高浓度盐溶液以及碱性溶液环境中均表现出良好的化学稳定性。

In this study, polypropylene copolymer PP[N(hexenol)]Ph2(PPPH) with aromatic tertiary amine group contents (mole fraction) of 2%, 2.5% and 3.3% were synthesized by bulk modification strategy, and PPPH hollow fiber membranes with hydrophilic properties were synthesized by introducing aromatic tertiary amine groups into polypropylene (PP). Nuclear magnetic resonance hydrogen spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were used to characterize the chemical structure and surface morphology of the membranes. At the same time, thermogravimetric analysis (TGA), contact angle measurement and mechanical property test were used to systematically evaluate the comprehensive properties of the membranes. The results showed that the introduction of aromatic tertiary amine groups improved the hydrophilic performance and thermal stability of PP hollow fiber membranes. When the content of the aromatic tertiary amine group was 3.3%, the water contact angle was reduced to 76 ℃, the thermal decomposition temperature of PPPH hollow fiber membrane was increased to 450 ℃, the pore size of PPPH hollow fiber membrane was 125 nm, the porosity was 38.7 %, the breaking strength was 65.0 MPa, and the elongation at break was 433.0%. The pure water flux of the modified hollow fiber membrane reached 385.0 L/(m2·h）, which was 1.6 times that of the PP hollow fiber membrane. In addition, PPPH hollow fiber membranes exhibit good chemical stability in both high-concentration salt solution and alkaline solution environments.

基金项目：

中央高校基本科研业务费专项资金

作者简介：

李浩（1999-），男，河南周口人，硕士研究生，研究方向为功能高分子材料

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