荷正电聚四氟乙烯复合纳滤膜的制备及表征

发布时间：2018-03-27 09:28

本文选题：聚四氟乙烯　切入点：界面聚合　出处：《高分子材料科学与工程》2017年07期

【摘要】：以聚四氟乙烯(PTFE)平板膜为基膜,对其进行亲水改性后,以支化聚乙烯亚胺(PEI)和均苯三甲酰氯(TMC)为主要单体,通过界面聚合制备了荷正电聚四氟乙烯复合纳滤膜。采用红外光谱、扫描电子显微镜、原子力显微镜和固体表面Zata电位分析仪研究了复合纳滤膜的表面化学结构、微观形貌和荷电特性,结果表明,在亲水PTFE基膜表面形成了致密的多层结构,复合纳滤膜在pH为中性的条件下呈现荷正电。通过优化制备条件,复合纳滤膜对MgCl_2溶液的截留率达到95.7%,水通量为13.47 L/(m~2·h)(测试液浓度1000 mg/L,操作压力0.4 MPa)。此外,测试复合纳滤膜对不同盐溶液的截留率大小顺序为MgCl_2(95.7%)MgSO_4(90.7%)Na_2SO_4(77.5%)NaCl(58.1%),对聚乙二醇(PEG)的截留相对分子质量为402。研究表明制备的复合纳滤膜在硬水软化领域具有潜在的应用价值。
[Abstract]:PTFE composite nanofiltration membrane was prepared by interfacial polymerization using PTFE flat membrane as base membrane, hydrophilic modification, branched polyimide (PEI) and tetrachloroyl chloride (TMC) as the main monomers, the composite nanofiltration membrane was prepared by interfacial polymerization. The surface chemical structure, micromorphology and charge characteristics of composite nanofiltration membrane were studied by scanning electron microscope, atomic force microscope and Zata potential analyzer on solid surface. The results showed that dense multilayer structure was formed on the surface of hydrophilic PTFE substrate. The composite nanofiltration membrane exhibits positive charge under neutral pH conditions. By optimizing the preparation conditions, the rejection rate of the composite nanofiltration membrane to MgCl_2 solution is 95.7, and the water flux is 13.47 L/(m~2 HX (measured solution concentration 1000 mg / L, operating pressure 0.4 MPA). The order of rejection rate of composite nanofiltration membrane to different salt solutions is MgCl _ (2) ~ (2-) ~ (95.7) and mg _ (so _ 4) _ (90.7) and Na2SO _ (4) ~ (77.5) respectively, the relative molecular mass of which is 4022.The results show that the composite nanofiltration membrane has potential application value in the field of hard water softening, and the relative molecular weight of this composite nanofiltration membrane is 402.The results show that the composite nanofiltration membrane has potential application value in the field of hard water softening.
【作者单位】：浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室;浙江理工大学纤维材料和加工技术研究浙江省重点实验室;
【基金】：浙江省自然科学基金资助项目(LY15B060010) 浙江省重大科技专项(2013C01055) 浙江理工大学521人才计划
【分类号】：TQ051.893

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