聚（偏二氯乙烯—氯乙烯）多孔膜制备及性能研究

发布时间：2018-04-15 19:14

  本文选题：聚(偏二氯乙烯-氯乙烯) + 亲水性　； 参考：《天津工业大学》2017年硕士论文

【摘要】：聚(偏二氯乙烯-氯乙烯)(P(VDC-VC))为半结晶聚合物,具有良好韧性、耐高温等特性,其作为膜材料的研究,国内外文献鲜有报道。本文以P(VDC-VC)为成膜聚合物,采用溶液相转化法制备了 P(VDC-VC)多孔膜,分析和讨论了成膜条件对膜结构与性能的影响。以P(VDC-VC)为成膜聚合物,N,N-二甲基乙酰胺(DMAc)为溶剂,采用溶液相转化法制备了 P(VDC-VC)平板膜。研究表明,所得P(VDC-VC)平板膜由表面皮层及横截面大孔支撑层组成,呈现出非对称膜结构。提高聚合物浓度或升高凝固浴温度均能提高P(VDC-VC)平板膜表面致密程度,进而改善对牛血清蛋白(BSA)的截留率及通量恢复率,对BSA截留率达90%以上。低凝固浴温度下所得膜通透性能较好。力学性能随聚合物浓度及聚合物分子量提高而增加,随凝固浴温度升高而降低。以聚乙二醇(PEG)、纳米二氧化硅(Si02)为添加改性剂,采用溶液相转化法制备了 P(VDC-VC)平板膜。通过调节PEG与SiO2的含量对膜形貌及孔结构进行调控。研究表明,PEG对P(VDC-VC)平板膜亲水性改善效果一般,随PEG含量增加,所得膜纯水通量先增大后减小。通过添加纳米SiO2,制备了 P(VDC-VC)/Si02杂化多孔膜,纳米Si02的加入明显提高多孔膜亲水性能和渗透性能,所得P(VDC-VC)/SiO2杂化膜对BSA溶液截留率达93.3%。采用干-湿法纺丝技术制备了 P(VDC-VC)中空纤维膜,研究了成膜条件及纳米Si02含量对中空纤维膜结构与性能的影响。结果表明,低温(12.0℃C)P(VDC-VC)铸膜液进入高温(40.0℃C)凝固浴所得中空纤维膜为内外双皮层结构,当纳米SiO2含量为1.Owt%时,纯水通量可达249.2L·m-2·h-1,对BSA截留率达94.6%。
[Abstract]:Polyvinylidene chloride (vinylidene chloride) (PVC-VDC) is a semi-crystalline polymer with good toughness and high temperature resistance.In this paper, the porous Pv-VDC-VC films were prepared by the solution phase inversion method, and the effects of the film forming conditions on the structure and properties of the membranes were analyzed and discussed.In this paper, the flat film of PnN- dimethyl acetamide (DMAC) was prepared by solution phase inversion method, in which the film was used as the film forming polymer (N- N- dimethyl acetamide).The results show that the PhanV DC-VC flat film is composed of surface layer and cross-section macroporous support layer, and presents an asymmetric membrane structure.Increasing the concentration of polymer or increasing coagulation bath temperature can improve the surface densification of the plate membrane, and then improve the retention rate and flux recovery rate of bovine serum protein (BSA). The rejection rate of BSA is more than 90%.The permeable properties of the films obtained at low coagulation bath temperature are better.The mechanical properties increased with the increase of polymer concentration and molecular weight, and decreased with the increase of coagulation bath temperature.Using polyethylene glycol (PEGN) and nano-silica (Si02) as modifiers, the Pv-VDC-VC flat film was prepared by solution phase inversion method.The morphology and pore structure of the film were regulated by adjusting the content of PEG and SiO2.The results showed that the hydrophilicity of the membrane was improved by PEG, and the pure water flux increased firstly and then decreased with the increase of PEG content.P(VDC-VC)/Si02 hybrid porous membranes were prepared by adding nano-SiO2.The hydrophilic and permeable properties of P(VDC-VC)/Si02 hybrid membranes were obviously improved with the addition of nano-SiO _ 2. The rejection rate of P(VDC-VC)/SiO2 hybrid membranes to BSA solution was 93.3%.The hollow fiber membranes were prepared by dry wet spinning technique. The effects of membrane formation conditions and nano- content on the structure and properties of hollow fiber membranes were studied.The results showed that the hollow fiber membrane obtained from the low temperature casting solution at 12.0 鈩，

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