选择性光交联法制备多孔结构薄膜

发布时间：2018-07-03 04:09

本文选题：多孔膜 + 选择性光交联　；参考：《北京化工大学》2016年硕士论文

【摘要】：相对于表面平整的薄膜材料,多孔薄膜材料具有更大的比表面积,对于大分子、纳米粒子等有很强的吸附作用,对与不同的分子也具有选择透过作用。因此,研究多孔膜的制备方法对于分离膜、生物工程、药物释放、传感器等领域具有重要价值。本论文中,研究了种制备复合成分薄膜的方法,通过选择性地光交联,使得复合多层膜中的不同部分产生稳定性差异,最终构筑了一种具有多孔结构的薄膜。首先,我们用两种正电荷的聚电解质(PAH与PEI)与一种负电性的聚电解质(PSS)作为构筑基元,聚电解质之间依靠静电引力吸附在基底表面,形成表面平整的多层膜。随后,将这种预先制备的多层膜用光化学交联法交联：在紫外光的激发下,一种光敏性的交联剂(DAS)可以选择性地将PAH和PSS聚电解质交联,使二者形成稳定的共价键,而另一种聚电解质PEI不能被这种交联剂交联,因此在多层膜中形成了稳定性存在差异的不同部分。最后,我们将经过交联处理的多层膜浸泡在碱性的溶液中,碱性的环境能够改变聚电解质的电离状态,破坏未发生交联的聚电解质之间的静电引力,使之从多层膜上脱落,在多层膜中形成原位的缺陷结构；而由于交联产生的共价键能在碱溶液中保持稳定,从而能够在基底上保留下来,因此形成了稳定的多孔结构薄膜。随后我们对多孔膜对离子的渗透性和表面形貌做了近一步的研究。
[Abstract]:Compared with the thin film material with flat surface, the porous thin film material has a larger specific surface area, and has a strong adsorption on macromolecules and nanoparticles, and a selective permeation effect on different molecules. Therefore, the preparation of porous membranes is of great value in the fields of separation membrane, bioengineering, drug release, sensor and so on. In this thesis, the method of preparing composite film is studied. By selective photocrosslinking, the stability of different parts of the composite multilayer is different, and a kind of porous film is constructed. Firstly, two kinds of positively charged polyelectrolytes (PAH and PEI) and a negative polyelectrolyte (PSS) are used as the building units. The polyelectrolyte is adsorbed on the substrate surface by electrostatic force to form a flat multilayer film. Subsequently, the prepared multilayer films were crosslinked by photochemical crosslinking: under the excitation of ultraviolet light, a kind of Guang Min crosslinking agent could selectively cross-link PAH and PSS polyelectrolyte to form a stable covalent bond between them. Another kind of polyelectrolyte PEI could not be crosslinked by this crosslinking agent, thus forming different parts with different stability in the multilayer films. Finally, we immerse the cross-linked multilayer film in alkaline solution, the alkaline environment can change the ionization state of polyelectrolyte, destroy the electrostatic force between the non-cross-linked polyelectrolyte, and make it fall off from the multilayer film. In situ defect structure is formed in the multilayer film, and the covalent bond produced by cross-linking can be kept stable in alkali solution, thus it can be retained on the substrate, thus forming a stable porous structure film. Then we studied the ion permeability and surface morphology of the porous membrane.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB383;O641.3

【相似文献】