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  本文選題：溫度響應(yīng)性　切入點：Janus納米片　出處：《遼寧大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：Janus材料由于獨特的不對稱性質(zhì)具有廣泛的應(yīng)用前景而深受科研人員的關(guān)注。聚合物Janus片狀材料,兼具Janus材料的不對稱性和聚合物的柔性與可塑性,而且片狀形貌加強了其不對稱性能。本文利用聚合物Janus片狀材料的可塑性為其增加了溫度響應(yīng)性和離子響應(yīng)性。首先通過模板法制備了溫度響應(yīng)性的聚合物Janus納米囊,打碎得到Janus納米片。驗證了Janus納米片具有溫度響應(yīng)性,并且可以用作顆粒乳化劑,穩(wěn)定油/水乳液。主要工作內(nèi)容如下:1.本文使用St?ber法制備得到了SiO_2納米微球,以SiO_2納米微球為犧牲模板,先后進(jìn)行氨基化改性和溴化改性,使其變成ATRP引發(fā)劑。通過ATRP活性自由基聚合接枝具有疏水性能的聚甲基丙烯酸叔丁酯(PtBMA),然后以N,N-亞甲基雙丙烯酰胺(MBA)作為交聯(lián)劑,進(jìn)行第二次ATRP活性自由基聚合接枝具有溫度響應(yīng)性的聚乙烯己內(nèi)酰胺(PNVCL),得到SiO_2復(fù)合納米微球。最后用氫氟酸刻蝕掉SiO_2內(nèi)核,得到溫度響應(yīng)性Janus囊,超聲打碎后得到溫度響應(yīng)性Janus納米片。通過FT-IR、Zeta電位、EDX、TGA、SEM、TEM等表征方式對Janus納米片的形貌和組成做了表征。通過溫度條件的調(diào)節(jié),測試了Janus納米片的溫度響應(yīng)性。從宏觀觀測了Janus納米片不同溫度條件下在超純水中的分散狀態(tài)的變化,從微觀觀測不同溫度條件下Janus納米片在掃描電鏡下的不同形貌變化,驗證Janus納米片的溫度響應(yīng)性。通過調(diào)節(jié)溫度條件,測定Janus納米片對油/水乳液的乳化性能,當(dāng)環(huán)境溫度適宜時用光學(xué)顯微鏡觀察其乳化性能,然后通過改變溫度,檢測其溫度響應(yīng)性所致的乳化性能衰減直至破乳。2.首先合成了溴化1-乙烯基-3-乙基咪唑離子液體(EVImBr)。然后將氨基化的硅球,繼續(xù)羥基化改性。通過硅球表面的羥基引發(fā)己內(nèi)酯的開環(huán)聚合,接枝具有疏水性能的聚己內(nèi)酯(PCL),然后將聚己內(nèi)酯末端的羥基溴化改性成大分子ATRP引發(fā)劑。然后以N,N-亞甲基雙丙烯酰胺(MBA)作為交聯(lián)劑再經(jīng)ATRP活性自由基聚合接枝聚溴化1-乙烯基-3-乙基咪唑離子液體(PEVIm Br)。得到SiO_2復(fù)合納米微球。最后用氫氟酸刻蝕掉SiO_2納米微球得到離子液體基Janus納米中空微球。將離子液體基Janus納米中空微球用超聲波細(xì)胞粉碎機打碎,得到離子液體基Janus納米片。
[Abstract]:Because of its unique asymmetric properties, Janus materials have attracted much attention from researchers. Polymer Janus lamellar materials have both asymmetry of Janus materials and flexibility and plasticity of polymers. In this paper, the plasticity of polymer Janus sheet material is used to increase its temperature response and ion response. Firstly, the thermo-responsive polymer Janus nanocapsules were prepared by template method. Janus nanoparticles were obtained by breaking. It was proved that Janus nanoparticles have temperature response and can be used as particle emulsifiers to stabilize oil / water emulsions. The main work is as follows: 1. SiO_2 nanospheres were prepared by ber method. Using SiO_2 nanospheres as sacrificial template, the amination modification and bromination modification were carried out successively. It was turned into ATRP initiator, and ATRP was grafted onto poly (tert-butyl methacrylate) with hydrophobic properties by ATRP active radical polymerization, and then Nn- methylene bisacrylamide (MBA) was used as crosslinking agent. The second ATRP active radical polymerization was carried out to graft polyvinylcaprolactam (PNVCLN) with temperature response to obtain SiO_2 composite nanospheres. Finally, the core of SiO_2 was etched by hydrofluoric acid, and a temperature responsive Janus capsule was obtained. The temperature responsive Janus nanocrystals were obtained by ultrasonic analysis. The morphology and composition of Janus nanoparticles were characterized by means of FT-IRN Zeta potential and EDX TGA SEMMA-TEM. The morphology and composition of Janus nanoparticles were characterized by adjusting the temperature conditions. The temperature response of Janus nanocrystals was tested. The dispersion state of Janus nanoparticles in ultrapure water at different temperatures was observed macroscopically, and the morphology of Janus nanocrystals at different temperatures was observed under scanning electron microscope. To verify the temperature response of Janus nanoparticles, the emulsifying properties of Janus nanoparticles to oil / water emulsions were determined by adjusting the temperature conditions, and the emulsifying properties of Janus nanoparticles were observed by optical microscope when the ambient temperature was suitable, and then by changing the temperature, The emulsifying properties due to its temperature response were measured to demulsification .2.Firstly, 1-vinyl-3-ethylimidazolium bromide ionic liquid (EVImBran) was synthesized. Continuous hydroxylation modification. The ring-opening polymerization of caprolactone was initiated by hydroxyl groups on the surface of silicon spheres. Poly (caprolactone) with hydrophobicity was grafted onto ATRP, then the hydroxyl bromide at the end of the polycaprolactone was modified into a macromolecular ATRP initiator. N- (N-methylene bisacrylamide) was then used as the crosslinking agent and then grafted by ATRP active radical polymerization. SiO_2 composite nanospheres were obtained from 1-vinyl-3-ethylimidazolium bromide ionic liquid. Finally, SiO_2 nanospheres were etched by hydrofluoric acid to obtain ionic liquid-based Janus hollow microspheres. The ultrasonic cell crusher broke, Ionic liquid based Janus nanoparticles were obtained.
【學(xué)位授予單位】：遼寧大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1;TQ317

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本文編號：1650136