膜科学与技术

位置：首页 >> 期刊内容阅读

ECTFE共混膜的结构调控及膜蒸馏性能表征

作者：周玥，刘庚，汪朝晖，汪效祖，崔朝亮

单位： 1.南京工业大学，化工学院，材料化学工程国家重点实验室，江苏南京 211816； 2. 南京工业大学，国家特种分离膜工程技术研究中心，江苏南京 211816

关键词：乙烯-三氟氯乙烯；添加剂；热致相分离；膜蒸馏

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2022,42(3):1-6

摘要：

采用热致相分离（TIPS）法，以偏苯三酸三辛酯（TOTM）为稀释剂，等规聚丙烯（iPP）、纳米二氧化硅（nano-SiO2）或微米级碳酸钙（CaCO3）为添加剂，制备乙烯-三氟氯乙烯共聚物（ECTFE）微孔膜。考察了不同种类添加剂iPP、nano-SiO2和CaCO3对ECTFE膜结构和性能的影响。结果表明：iPP的加入可以诱导液-液相分离的发生，ECTFE膜形成胞腔状结构；加入的nano-SiO2或CaCO3可调控聚合物核，改变了固-液分相过程中ECTFE膜的结晶形式，由球晶结构逐渐转变为蜂窝状结构。另外，加入nano-SiO2能有效改善ECTFE膜的机械性能，增加膜的孔径和孔隙率，ECTFE膜的拉伸率增加了44.2%，平均孔径和孔隙率分别为379.7 nm和66.1%。在真空膜蒸馏（VMD）实验中，相同的进料条件下，加入nano-SiO2的ECTFE膜渗透通量较原膜提高约24%，达到24.53 L/(m2·h)，而盐截留率高达99.97%。

A porous poly(ethylene-chlorotrifluoroethylene) (ECTFE) membrane was prepared via thermally induced phase separation (TIPS) using an environmentally friendly diluent trioctyl trimellitate (TOTM), isotatic polypropylene (iPP), nano-silica (nano-SiO2), or micron-sized calcium carbonate (CaCO3) as the additive. The effects of different types of additives iPP, nano-SiO2 and CaCO3 on the structure and properties of the membrane were investigated. The result shows that the addition of iPP could promote liquid-liquid phase separation and the membrane formed a cellular structure. The addition of nano-SiO2 and CaCO3 was used as a nucleation agent in phase separation process, making the spherulite structure transfer to honeycomb structure. In addition, the addition of nano-SiO2 could improve the mechanical properties of the ECTFE membrane and could increase the pore size and porosity of ECTFE membrane. The elongation at break of ECTFE membrane increased by 44.2%, and the average pore-size and porosity were 379.7 nm and 66.1%, respectively. In the vacuum membrane distillation (VMD) process, the permeation flux of the membrane with nano-SiO2 increased by 24.26% compared with the original membrane in the same feed conditions, reaching 24.53 L/(m2·h), and the salt rejection rate reached at 99.97%.

基金项目：

江苏省人力资源和社会保障厅六大人才高峰（JNHB-036）

作者简介：

周玥（1991，10），女，江苏南通，硕士，助理实验师，主要研究方向为膜分离； E-mail：1406640151@qq.com

参考文献：

[1] Alkhudhiri A, Darwish N, Hilal N. Membrane distillation: A comprehensive review [J]. Desalination, 2012, 287: 2-18.
[2] 徐静莉, 孙国富, 都昌盛. PP中空纤维膜用于真空膜蒸馏的苦咸水淡化[J]. 油气田地面工程, 2015, 34(01): 23-24.
[3] Cui Z L, Drioli E, Lee Y M. Recent progress in fluoropolymers for membranes [J]. Progress in Polymer Science, 2014, 39(1): 164-98.
[4] 王学军. 含氟聚合物技术与市场需求分析 [J]. 有机氟工业, 2019, (03): 36-42.
[5] Ramaswamy S, Greenberg A R, Krantz W B. Fabrication of poly (ECTFE) membranes via thermally induced phase separation[J]. Journal of Membrane Science, 2002, 210(1): 175-80.
[6] Roh I J, Ramaswamy S, Krantz W B, et al. Poly(ethylene chlorotrifluoroethylene) membrane formation via thermally induced phase separation (TIPS) [J]. Journal of Membrane Science, 2010, 362(1-2): 211-20.
[7] Kim J F, Kim J H, Lee Y M, et al. Thermally induced phase separation and electrospinning methods for emerging membrane applications: A review [J]. Aiche Journal, 2016, 62(2): 461-90.
[8] Drioli E, Santoro S, Simone S, et al. ECTFE membrane preparation for recovery of humidified gas streams using membrane condenser [J]. Reactive & Functional Polymers, 2014, 79: 1-7.
[9] Pan J, Xiao C, Huang Q, et al. ECTFE porous membranes with conveniently controlled microstructures for vacuum membrane distillation [J]. Journal of Materials Chemistry A, 2015, 3(46): 23549-59.
[10] Karkhanechi H, Rajabzadeh S, Dinicolo E, et al. Preparation and characterization of ECTFE hollow fiber membranes via thermally induced phase separation (TIPS) [J]. Polymer, 2016, 97: 515-24.
[11] 徐克, 汪效祖, 汪朝晖, 等. 绿色稀释剂制备乙烯-三氟氯乙烯共聚物多孔膜 [J]. 南京工业大学学报(自然科学版), 2019, 41(03): 306-10.
[12] Wang Q, Wu W, Tang Y, et al. Thermal degradation kinetics of plasticized poly (Vinyl Chloride) with six different plasticizers [J]. Journal of Macromolecular Science Part B-Physics, 2017, 56(6): 420-34.
[13] 赵丝丝, 相波, 王作华, 等. 添加剂对PVDF膜结构和性能的影响 [J]. 化学研究与应用, 2010, 22(12): 1551-6.
[14] 郭春刚, 刘国昌, 车振宁, 等.ECTFE/ATBC/GO铸膜液体系流变性能研究 [J]. 膜科学与技术, 2019, 39(3): 8-13,28.
[15] 刘红晶, 王园园, 姚辉, 等. 聚偏氟乙烯多孔膜的结晶行为 [J]. 沈阳工业大学学报, 2019, 41(01): 31-5.
[16] Choi F, Chen R, Acosta E J. Predicting the effect of additives on wormlike micelle and liquid crystal formation and rheology with phase inversion phenomena [J]. Journal of Colloid And Interface Science, 2020, 564: 216-29.
[17] 胡文婷. 利用红外光谱法对聚乙烯和聚丙烯进行剖析 [J]. 化工设计通讯, 2017, 43(09): 146.
[18] Abdullah A, Naif D, Nidal H. Membrane distillation: A comprehensive review [J]. Desalination, 2011, 287: 2-18.

服务与反馈：

【文章下载】【加入收藏】

《膜科学与技术》编辑部地址：北京市朝阳区北三环东路19号蓝星大厦邮政编码：100029 电话：010-64426130/64433466 传真：010-80485372邮箱：mkxyjs@163.com