膜科学与技术

碳氟基团修饰的多孔陶瓷膜润湿性、表面自由能及渗透性能的研究

作者：王煜琨，韦奇，张少康，李群艳，聂祚仁

单位：北京工业大学材料科学与工程学院，北京100124

关键词：十七氟癸基；多孔陶瓷膜；表面自由能；润湿性；渗透性能

出版年,卷(期):页码： 2018,38(2):52-59

摘要：

以十七氟癸基三乙氧基硅烷和乙醇分别作为修饰剂和溶剂，通过后接枝法将十七氟癸基修饰到γ/α-Al2O3多孔陶瓷膜表面，对碳氟基团修饰的γ/α-Al2O3多孔陶瓷膜表面形貌、化学组成、亲/疏水性进行表征，并考察接枝的碳氟基团对其表面自由能和气体/纯水渗透性能的影响。结果表明，碳氟基团的引入极大地降低了γ/α-Al2O3多孔陶瓷膜的表面自由能，使其表面发生从亲水到疏水的转变。接枝到γ/α-Al2O3多孔陶瓷膜孔道的碳氟基团一定程度上增加了气阻，使得气体渗透率略有下降，气体分子在孔道内的输运遵循Knudsen扩散机制。压差0.35MPa条件下，纯水不能透过修饰后的α-Al2O3以及修饰后的γ/α-Al2O3多孔陶瓷膜。

Fluorocarbon groups were silylated on porous γ/α-Al2O3 ceramic membranes via post-grafting process with 1H,1H,2H,2H-Perflouorodecyltriethoxysilane(PFDTES) as silylation agent and ethanol as solvent. The surface morphology, chemical composition and wettability of the silylated porous γ/α-Al2O3 ceramic membranes were characterized. The influence of fluorocarbon groups on the surface free energy and gas/pure water permeation performance of the obtained materials was also investigated in detail. The results show that the incorporation of fluorocarbon greatly reduces the surface free energy of porous γ/α-Al2O3 ceramic membranes, and leads to a transformation from hydrophility to hydrophobicity. A slight decrease of gas permeance is observed due to the pore blocking of porous γ/α-Al2O3 ceramic membranes by fluorocarbon groups. The transport of gas molecules in the pore channels complies with Knudsen diffusion. Liquid water is not able to permeate the silylated porous α-Al2O3 ceramic and the silylated γ/α-Al2O3 ceramic membranes under a pressure difference of 0.35MPa.

第一作者简介：王煜琨（1991-），男，甘肃武威人，硕士生，从事用于气体分离的微孔膜材料的制备与表征. *通讯作者，E-mail:qiwei@bjut.edu.cn

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