Surface modification of PVDF hollow fiber membrane to enhance hydrophobicity using organosilanes

被引:37
作者
Sairiam, Sermpong [1 ,2 ]
Loh, Chun Heng [3 ,4 ]
Wang, Rong [3 ,4 ]
Jiraratananon, Ratana [5 ]
机构
[1] Chulalongkorn Univ, Grad Sch, Int Postgrad Programs Environm Management, Bangkok 10330, Thailand
[2] Chulalongkorn Univ, Ctr Excellence Environm & Hazardous Waste Managem, Bangkok 10330, Thailand
[3] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
[4] Singapore Membrane Technol Ctr, Nanyang Technol Univ, Singapore 639798, Singapore
[5] King Mongkuts Univ Technol Thonburi, Dept Chem Engn, Bangkok 10140, Thailand
关键词
alkaline treatment; hydrophobicity; organosilanes; plasma activation; PVDF hollow fiber membrane; surface modification; CERAMIC MEMBRANES; POLY(VINYLIDENE FLUORIDE); GAS-ABSORPTION; PLASMA; FLUOROALKYLSILANES; DISTILLATION; PERFORMANCE; CONTACTORS;
D O I
10.1002/app.39197
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This work investigates the membrane modification to enhance hydrophobicity aiming for applications as membrane contactors. The PVDF membranes were activated by NaOH and by plasma activation followed by grafting using three organosilanes. For the NaOH, the contact angle of original membranes (68 degrees) was decreased from 44 degrees to 31 degrees with increasing NaOH concentration from 2.5M to 7.5M at 60 degrees C for 3 h. The contact angle of NaOH treated membranes was increased to 100 degrees after modification with 0.01M FAS-C8 for 24 h. A needle-like structure was observed on the membrane surface while there was no significant change in pore size and pore size distribution. Moreover, FTIR and XPS data showed Si peak and composition. The mechanical strength was improved. The surface modified membranes under helium plasma activation followed by grafting with 0.01M FAS-C8 for 24 h showed higher contact angle, mechanical strength and surface roughness than that obtained by NaOH activation method while other physical properties did not change. The long-term performance test for 15 days of operation was conducted. The modified membranes exhibited good stability and durability for CO2 absorption. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
引用
收藏
页码:610 / 621
页数:12
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