Acrylic Acid Grafting of Polyethylene Hollow Fiber Membranes in a Module Scale via Long-distance and Dynamic Low-temperature Plasma Flow

作者：Li Meisheng; Zhao Zhiping^*; Wang Mingxing

来源：Chemical Journal of Chinese Universities, 2014, 35(4): 888-894.

DOI：10.7503/cjcu20130841

• Plasma
• Polyethylene hollow fiber membrane
• Module
• Grafting
• Acrylic acid

Long-distance and dynamic Ar low-temperature plasma flow pretreatment of polyethylene (PE) membrane in a module scale and subsequent acrylic acid(AA) grafting in aqueous solutions were developed to prepare hydrophilic PE hollow fiber membrane modules(PE-g-AA) successfully. This novel plasma chemical modification exhibited high efficiency, environment-friendly process and low surface etching. In the PE-g-AA membrane module, almost all contact angles along with fiber axial distance from the plasma inlet for outside membrane surfaces were close to 500, far smaller than that of virgin membranes(about 1200). The improvement in surface hydrophilicity of PE-g-AA membrane was mainly due to the chemically grafted implantation of a large amount of -COOH polar groups onto outside membrane surfaces. Meanwhile, the uniform of chemistry and morphology for outside PE-g-AA membrane surfaces was improved greatly. Moreover, after 7 times water filtrations during 120 d storage, the steady water flux of PE-g-AA module was still about 1. 5 times of that of virgin. one, and its average contact angle recovered by only about 8 degrees. The PE-g-AA module exhibited good hydrophilic stability. Also, the grafting reduced bovine serum albumin(BSA) fouling and increased pure water flux. After cleaning, the pure water flux of fouled PE-g-AA module during filtration of BSA aqueous solution can recover to about 81. 79% of that of before. fouling.

• 出版日期2014-4
• 单位北京理工大学