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EVOH纳米纤维功能膜的制备及油水分离性能研究

作者：郑晓婷，徐丹丹，陆建伟，沈青，肖茹

单位：东华大学材料科学与工程学院，上海 201620

关键词：乙烯-乙烯醇共聚物（EVOH）；纳米纤维膜；孔径分布；过滤性能

DOI号：

分类号： TQ34

出版年,卷(期):页码： 2016,36(2):20-27

摘要：

利用多组分不相容体系熔融共混挤出法制备乙烯-乙烯醇共聚物（EVOH）纳米纤维，以PET无纺布为基材，经分散-成膜过程制备EVOH纳米纤维膜，并在其上沉积纳米纤维素晶（NCC）制备EVOH纳米纤维复合膜，研究EVOH纳米纤维膜及其复合膜结构性能和油水分离特性。结果表明，随着单位面积纳米纤维质量增加，EVOH纳米纤维膜孔隙率先增加后趋于稳定，孔径和接触角呈减小趋势，水通量均高于商业微孔滤膜。此外，在EVOH纳米纤维膜表面沉积NCC可明显改善膜亲水性，所制备复合膜对油水乳液截留率可达98.5%，且其通量较未修饰的EVOH纳米纤维膜和商业微孔滤膜稳定，在水过滤领域具有潜在应用前景。

The thermoplastic polymer nanofibers was obtained through the phase separation during extrusion melt blending, in which the dispersed phase was stretched into nanofibers after the matrix phase removed. Dispersion and deposition method were used to prepare the nanofiber based composite membrane. This kind of nanofiber membrane has the advantage of high filtration efficiency, hydrophilic, resistant to pollution for water filtration. In this paper, EVOH nanofiber membrane was firstly prepared by depositing EVOH nanofiber suspension on the PETnon-woven fabric, which was then modified by Nanocellulose crystal (NCC) to gain the composite membrane with NCCbarrier layer, EVOH intermediate layer and PET support layer. We studied the impact of nanofiberquality of unit areaonthe morphology, porosity, pore size and distribution, contact angle and water flux of EVOH nanofiber membranes. Self-made oil-water emulsion was used to evaluatethe filtration performance of EVOH nanofibercomposite membrane. The results show thatwith the increasing of nanofiberquality, the EVOH nanofiber membranes showed an increase in the porosity and a decrease in pore size and contact angle, and expressed higher water flux than the commercial micro-filtrationmembrane. It is demonstrated that EVOH nanofibercompositemembraneexhibited a higher rejection rate and stabilityof filtration flux thanunmodifiedEVOHnanofiber membrane and the commercial micro-filtration membrane for the filtration of oil and water emulsion.

基金项目：

国家自然科学基金资助（No.20874010）；高等学校学科创新引智计划资助（No.111-2-01,B07024）

作者简介：

郑晓婷（1991-），女，江苏省盐城市人，硕士生，从事热塑性高聚物纳米纤维膜的研究及应用，E-mail:zxt4929@163.com. *通讯作者，E-mail: xiaoru@dhu.edu.cn.

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