發(fā)布時間：2018-07-03 04:09

  本文選題：多孔膜 + 選擇性光交聯(lián)��； 參考：《北京化工大學》2016年碩士論文

【摘要】：相對于表面平整的薄膜材料,多孔薄膜材料具有更大的比表面積,對于大分子、納米粒子等有很強的吸附作用,對與不同的分子也具有選擇透過作用。因此,研究多孔膜的制備方法對于分離膜、生物工程、藥物釋放、傳感器等領(lǐng)域具有重要價值。本論文中,研究了種制備復合成分薄膜的方法,通過選擇性地光交聯(lián),使得復合多層膜中的不同部分產(chǎn)生穩(wěn)定性差異,最終構(gòu)筑了一種具有多孔結(jié)構(gòu)的薄膜。首先,我們用兩種正電荷的聚電解質(zhì)(PAH與PEI)與一種負電性的聚電解質(zhì)(PSS)作為構(gòu)筑基元,聚電解質(zhì)之間依靠靜電引力吸附在基底表面,形成表面平整的多層膜。隨后,將這種預先制備的多層膜用光化學交聯(lián)法交聯(lián)：在紫外光的激發(fā)下,一種光敏性的交聯(lián)劑(DAS)可以選擇性地將PAH和PSS聚電解質(zhì)交聯(lián),使二者形成穩(wěn)定的共價鍵,而另一種聚電解質(zhì)PEI不能被這種交聯(lián)劑交聯(lián),因此在多層膜中形成了穩(wěn)定性存在差異的不同部分。最后,我們將經(jīng)過交聯(lián)處理的多層膜浸泡在堿性的溶液中,堿性的環(huán)境能夠改變聚電解質(zhì)的電離狀態(tài),破壞未發(fā)生交聯(lián)的聚電解質(zhì)之間的靜電引力,使之從多層膜上脫落,在多層膜中形成原位的缺陷結(jié)構(gòu)；而由于交聯(lián)產(chǎn)生的共價鍵能在堿溶液中保持穩(wěn)定,從而能夠在基底上保留下來,因此形成了穩(wěn)定的多孔結(jié)構(gòu)薄膜。隨后我們對多孔膜對離子的滲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.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TB383;O641.3

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