【摘要】：離子交換膜在物質(zhì)的分離純化領域有著重要的應用價值。近年來,表面引發(fā)原子轉(zhuǎn)移自由基聚合(Surface-initiated Atom Transfer Radical Polymerization, SI-ATRP)技術(shù)在表面化學修飾中受到廣泛關(guān)注。本文利用SI-ATRP技術(shù)制備了兩種新型離子交換膜,并對其吸附性能進行了研究。 利用引發(fā)劑2-溴異丁酰溴(2-BIB)與再生纖維素膜表面的羥基反應,得到SI-ATRP反應所需的大分子引發(fā)劑,然后在膜表面可控接枝聚丙烯腈、聚甲基丙烯酸叔丁酯。再分別利用“點擊”化學反應和水解反應得到聚乙烯基四唑膜和聚甲基丙烯酸膜。用X-射線光電子能譜儀(XPS)、紅外光譜(ATR-FTIR)、孔徑測試、元素分析等對膜的理化性質(zhì)進行了表征,證明膜表面已成功接枝聚乙烯四唑、聚甲基丙烯酸。用掃描電鏡(SEM)對膜的表面形貌及結(jié)構(gòu)進行了表征,發(fā)現(xiàn)隨著聚合時間的增長,膜的孔徑逐漸減小。靜態(tài)吸附實驗證實聚合物的鍵合量、吸附容量在一定范圍內(nèi)隨著聚合時間的增大而增大。其對溶菌酶的最大平衡吸附容量分別達到475.6mg/mL和412.8 mg/mL。結(jié)果表明,用本文方法制備的離子交換膜在生物樣品的分離純化中具有潛在的應用價值。
[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.
【學位授予單位】：西北大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：O631.3

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