本文選題：Gemini表面活性劑 + 蠕蟲膠束�。� 參考：《江南大學》2017年碩士論文

【摘要】：Gemini表面活性劑是近幾年來倍受關注的兩親分子,其新穎且多樣化的分子結構使其具有很多獨特的性質。Gemini表面活性劑在頭基或靠近頭基處引入聯(lián)接鏈,能夠有效地控制Gemini表面活性劑單元分子離子頭基間的距離,使其烷烴鏈密度和頭基電荷密度均發(fā)生明顯改變。頭基電荷密度的改變,必然對溶液中反離子的作用更加敏感。本論文選取同分異構體的有機鹽及系列具有相反電荷的表面活性劑分別與季銨鹽陽離子Gemini表面活性劑復配,系統(tǒng)地研究了Gemini表面活性劑在構筑蠕蟲膠束的過程中,有機鹽及相反電荷表面活性劑結構的微小變化對蠕蟲膠束的形成和生長及溶液粘彈性的影響,相關結果對于深入了解Gemini表面活性劑的自組裝特性及總結分子間相互作用規(guī)律有著重要科學意義。主要研究內容如下:1.利用穩(wěn)態(tài)和動態(tài)剪切流變實驗手段,研究了三種同分異構體的有機鹽,鄰羥基苯甲酸鈉(o-ph-ONa)、間羥基苯甲酸鈉(m-ph-ONa)和對羥基苯甲酸鈉(p-ph-ONa)對2-羥基-三亞甲基-α,ω-雙十二烷基三甲基溴化銨(12-3(OH)-12)自組裝行為的影響即鹽/12-3(OH)-12復配體系中蠕蟲膠束形成和生長的影響。通過表面張力法和1H-1H 2D NOESY法來驗證有機鹽和表面活性劑12-3(OH)-12相互作用的方式和程度。研究結果發(fā)現(xiàn),三種有機鹽均與12-3(OH)-12分子發(fā)生相互作用,有效促進了12-3(OH)-12溶液中蠕蟲膠束的形成。有機鹽分子結構的微小變化,對Gemini表面活性劑蠕蟲膠束的形成和生長產(chǎn)生的影響差別較大,并最終導致溶液粘彈性的差異。其中,o-ph-ONa更易促進12-3(OH)-12分子形成蠕蟲膠束,m-ph-ONa次之,而p-ph-ONa促進體系形成蠕蟲膠束的能力最弱。2.合成了一系列新型羧酸鹽陰離子Gemini表面活性劑SL-n-SL(n=3,6,10),利用質譜、氫譜對其結構進行了確證。通過Py熒光探針法和表面張力法測定了三種羧酸鹽陰離子Gemini表面活性劑在25 oC下的表面活性,SL-n-SL(n=3,6,10)的cmc值分別是0.29mmol·L-1、0.058 mmol·L-1和0.012 mmol·L-1,表明三種表面活性劑在水溶液中的聚集能力很強,且強度隨聯(lián)接鏈的增長而變大;γcmc值分別是31.96 mN?m-(16)、36.18 mN?m-(16)和36.27 m N?m-(16),SL-n-SL的聯(lián)接鏈為3時降低水表面張力的能力最強。吸附分子的最小截面積Amin分別是0.295 nm2、0.347 nm2和0.569 nm2,聯(lián)接鏈越短,分子在界面層的平均占據(jù)面積越小。3.利用羧酸鹽陰離子Gemini表面活性劑SL-n-SL(n=3,6,10)分別與季銨鹽Gemini表面活性劑12-3(OH)-12進行復配,考察了SL-n-SL聯(lián)接鏈長度的變化對12-3(OH)-12自組裝行為的影響。研究結果表明,當聯(lián)接鏈為3時,12-3(OH)-12溶液的粘彈性變化最明顯,在陰陽離子表面活性劑摩爾比(β)為0.06時,混合溶液的零剪切粘度達到最大值(94.7 Pa·s);當聯(lián)接鏈為6時,混合溶液在β=0.056時出現(xiàn)最大零剪切粘度(75 Pa·s);當聯(lián)接鏈增加到10時,混合溶液的最大零剪切粘度基本保持不變(74.9 Pa·s)。這說明聯(lián)接鏈的長度對復配體系膠束的形成和生長有著重要的影響。
[Abstract]:Gemini surfactant is a two parent molecule that has attracted much attention in recent years. Its novel and diversified molecular structure makes it have many unique properties of.Gemini surfactants in the head base or near the head base, which can effectively control the distance between the ionic head of the Gemini surfactant unit and make the chain density of alkanes. The charge density of the head base changed obviously. The change of the charge density of the head base was more sensitive to the action of the anti ion in the solution. In this paper, the organic salt of the isomer and the surface active agent with the opposite charge were mixed with the quaternary ammonium cationic Gemini surfactants respectively. The surface activity of Gemini was systematically studied. During the construction of the worm micelles, the small changes in the structure of the organic salt and the opposite charge surface active agent influence the formation and growth of the worm micelles and the viscoelasticity of the solution. The related results have important scientific significance for understanding the self-assembly characteristics of Gemini surfactant and summarizing the intermolecular interaction. The following contents are as follows: 1. the self-assembly of three kinds of isomers of organic salts, sodium hydroxy benzoate (o-ph-ONa), sodium hydroxy benzoate (m-ph-ONa) and sodium hydroxy benzoate (p-ph-ONa) on 2- hydroxyl Sanya methyl - alpha, Omega didodecyl three methyl bromide (12-3 (OH) -12) were studied by the steady and dynamic shear rheological experiments. Influence of the formation and growth of worm micelles in the compound system of salt /12-3 (OH) -12. The method and degree of interaction between organic salts and surfactant 12-3 (OH) -12 were verified by surface tension method and 1H-1H 2D NOESY method. The results showed that the three organic salts were all interacting with 12-3 (OH) -12 molecules and effectively promoted 12-3 (OH) -12. The formation of the molecular structure of the organic salt in the solution, the small changes in the molecular structure of the organic salts have a great influence on the formation and growth of the Gemini surfactant worm micelles, and eventually lead to the difference in the viscoelasticity of the solution. Among them, o-ph-ONa is more likely to promote 12-3 (OH) -12 molecules to form a worm micelle, m-ph-ONa, and p-ph-ONa to promote the formation of the system. A series of new carboxylate anion Gemini surfactants SL-n-SL (n=3,6,10) was synthesized by.2.. The structure of SL-n-SL (n=3,6,10) was confirmed by mass spectrometry and hydrogen spectrum. The surface activity of three carboxylate anion Gemini surface activators under 25 oC was determined by Py fluorescence probe method and surface tension method, SL-n-SL (n=3,6,10). The CMC values are 0.29mmol. L-1,0.058 mmol. L-1 and 0.012 mmol. L-1 respectively. It shows that the aggregation ability of three surfactants in aqueous solution is very strong and the strength increases with the increase of the link. The value of gamma CMC is 31.96 mN? M- (16), 36.18 mN, m- (16) and 36.27, 16), and the ability to reduce water surface tension when the link chain is 3 The minimum intercepting area Amin of the adsorbate molecule is 0.295 nm2,0.347 Nm2 and 0.569 Nm2 respectively, the shorter the link chain, the smaller the average occupying area of the molecule in the interface layer,.3. using the carboxylate anion Gemini surface active agent SL-n-SL (n=3,6,10) and the quaternary ammonium salt Gemini surfactant 12-3 (OH) -12, respectively, to investigate the length of the SL-n-SL chain length. The effect of the change on the self assembly behavior of 12-3 (OH) -12. The results show that when the link chain is 3, the viscoelastic changes of the 12-3 (OH) -12 solution are most obvious. When the mole ratio (beta) is 0.06, the zero shear viscosity of the mixed solution reaches the maximum value (94.7 Pa. S). When the link is 6, the mixed solution appears most in beta =0.056. The large zero shear viscosity (75 Pa. S), when the link increase to 10, the maximum zero shear viscosity of the mixed solution remains unchanged (74.9 Pa. S). This indicates that the length of the link chain has an important effect on the formation and growth of the micelle of the compound system.
【學位授予單位】：江南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O647.2

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相關期刊論文 前3條

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本文編號：2038922