SI-ATRP法制备的离子交换膜及其应用
发布时间：2018-10-08 12:56
【摘要】：离子交换膜在物质的分离纯化领域有着重要的应用价值。近年来,表面引发原子转移自由基聚合(Surface-initiated Atom Transfer Radical Polymerization, SI-ATRP)技术在表面化学修饰中受到广泛关注。本文利用SI-ATRP技术制备了两种新型离子交换膜,并对其吸附性能进行了研究。 利用引发剂2-溴异丁酰溴(2-BIB)与再生纤维素膜表面的羟基反应,得到SI-ATRP反应所需的大分子引发剂,然后在膜表面可控接枝聚丙烯腈、聚甲基丙烯酸叔丁酯。再分别利用“点击”化学反应和水解反应得到聚乙烯基四唑膜和聚甲基丙烯酸膜。用X-射线光电子能谱仪(XPS)、红外光谱(ATR-FTIR)、孔径测试、元素分析等对膜的理化性质进行了表征,证明膜表面已成功接枝聚乙烯四唑、聚甲基丙烯酸。用扫描电镜(SEM)对膜的表面形貌及结构进行了表征,发现随着聚合时间的增长,膜的孔径逐渐减小。静态吸附实验证实聚合物的键合量、吸附容量在一定范围内随着聚合时间的增大而增大。其对溶菌酶的最大平衡吸附容量分别达到475.6mg/mL和412.8 mg/mL。结果表明,用本文方法制备的离子交换膜在生物样品的分离纯化中具有潜在的应用价值。
[Abstract]:Ion exchange membrane has important application value in the field of separation and purification of substances. In recent years, surface initiated atom transfer radical polymerization (Surface-initiated Atom Transfer Radical Polymerization, SI-ATRP) has attracted much attention in surface chemical modification. In this paper, two new ion exchange membranes were prepared by SI-ATRP and their adsorption properties were studied. Macromolecular initiators for SI-ATRP reaction were obtained by the reaction of 2-bromoisobutylol bromide (2-BIB) with hydroxyl groups on the surface of regenerated cellulose membranes, and then the polyacrylonitrile (pan) and poly (tert-butyl methacrylate) were grafted on the membrane surface. Polyethylenetetrazole film and polymethacrylate film were obtained by "click" chemical reaction and hydrolysis respectively. The physicochemical properties of the films were characterized by X-ray photoelectron spectroscopy (ATR-FTIR), (XPS), infrared spectroscopy (ATR-FTIR), pore size measurement and elemental analysis. It was proved that the surface of the membranes was successfully grafted with polyethylene tetrazole and poly (methacrylic acid). The surface morphology and structure of the membrane were characterized by scanning electron microscope (SEM). It was found that the pore size of the membrane decreased with the increase of polymerization time. Static adsorption experiments show that the binding capacity and adsorption capacity of the polymer increase with the increase of polymerization time. The maximum equilibrium adsorption capacity of lysozyme reached 475.6mg/mL and 412.8 mg/mL., respectively. The results show that the ion exchange membrane prepared by this method has potential application value in the separation and purification of biological samples.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：O631.3
本文编号：2256833
[Abstract]:Ion exchange membrane has important application value in the field of separation and purification of substances. In recent years, surface initiated atom transfer radical polymerization (Surface-initiated Atom Transfer Radical Polymerization, SI-ATRP) has attracted much attention in surface chemical modification. In this paper, two new ion exchange membranes were prepared by SI-ATRP and their adsorption properties were studied. Macromolecular initiators for SI-ATRP reaction were obtained by the reaction of 2-bromoisobutylol bromide (2-BIB) with hydroxyl groups on the surface of regenerated cellulose membranes, and then the polyacrylonitrile (pan) and poly (tert-butyl methacrylate) were grafted on the membrane surface. Polyethylenetetrazole film and polymethacrylate film were obtained by "click" chemical reaction and hydrolysis respectively. The physicochemical properties of the films were characterized by X-ray photoelectron spectroscopy (ATR-FTIR), (XPS), infrared spectroscopy (ATR-FTIR), pore size measurement and elemental analysis. It was proved that the surface of the membranes was successfully grafted with polyethylene tetrazole and poly (methacrylic acid). The surface morphology and structure of the membrane were characterized by scanning electron microscope (SEM). It was found that the pore size of the membrane decreased with the increase of polymerization time. Static adsorption experiments show that the binding capacity and adsorption capacity of the polymer increase with the increase of polymerization time. The maximum equilibrium adsorption capacity of lysozyme reached 475.6mg/mL and 412.8 mg/mL., respectively. The results show that the ion exchange membrane prepared by this method has potential application value in the separation and purification of biological samples.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：O631.3
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