本文選題：動(dòng)態(tài)共價(jià)鍵　切入點(diǎn)：乳液　出處：《湘潭大學(xué)》2017年碩士論文

【摘要】：乳液是兩種不相容的液體在乳化劑存在下經(jīng)乳化作用形成的熱力學(xué)上穩(wěn)定的分散體系。刺激響應(yīng)性乳液是指乳液的形成和去乳化可通過(guò)外界條件,如溫度、酸堿性、離子強(qiáng)度的改變來(lái)調(diào)控。具有響應(yīng)性去乳化的乳液在采油、界面反應(yīng)等領(lǐng)域有重要應(yīng)用。本論文基于B-O可逆共價(jià)鍵構(gòu)建刺激響應(yīng)性乳化劑,借助B-O共價(jià)鍵的可逆性調(diào)控乳液的穩(wěn)定性,從而制備出pH及糖響應(yīng)乳液。論文研究?jī)?nèi)容主要包括以下兩個(gè)部分:(1)核動(dòng)態(tài)共價(jià)鍵交聯(lián)聚合物納米粒子穩(wěn)定的響應(yīng)性Pickering乳液。首先通過(guò)可逆加成斷裂鏈轉(zhuǎn)移(RAFT)聚合方法合成聚(N,N-二甲基丙烯酰胺)-b-聚(丙烯酰氨基苯硼酸)(PDMA-b-PAPBA)嵌段聚合物。在嵌段聚合物的水溶液中,利用PDMA-b-PAPBA中苯硼酸(PBA)側(cè)基基團(tuán)與聚乙烯醇(PVA)二醇基團(tuán)之間復(fù)合,獲得具有核-殼結(jié)構(gòu)、核可逆共價(jià)鍵交聯(lián)的聚合物納米粒子(CCPNs)。以CCPNs為粒子乳化劑,正癸醇為油相,水為連續(xù)相制備水包油Pickering乳液。由于B-O動(dòng)態(tài)共價(jià)鍵的pH及葡萄糖響應(yīng)性,CCPNs的結(jié)構(gòu)和形貌隨pH和葡萄糖濃度變化而變化。CCPNs的界面活性隨粒子結(jié)構(gòu)和形貌的變化而變化,并賦予其穩(wěn)定的乳液pH及葡萄糖響應(yīng)性去乳化特性。詳細(xì)研究了CCPNs結(jié)構(gòu)刺激響應(yīng)性以及CCPNs穩(wěn)定的Pickering乳液的刺激響應(yīng)性去乳化特性。(2)動(dòng)態(tài)接枝共聚物油-水界面原位生成及其穩(wěn)定的響應(yīng)性乳液。首先通過(guò)RAFT聚合方法合成聚(N,N-二甲基丙烯酰胺)-ran-(聚丙烯酰氨基苯硼酸)(PDMA-ran-PAPBA)無(wú)規(guī)共聚物和端雙羥基的聚苯乙烯(PS(OH)2)。將(PDMA-ran-PAPBA)和PS(OH)2分別以一定濃度溶于堿性水和甲苯,并將兩種聚合物溶液以一定體積混合并經(jīng)高速均質(zhì)攪拌后得到穩(wěn)定的水包油乳液。借助(PDMA-ran-PAPBA)中苯硼酸(PBA)側(cè)基基團(tuán)與PS(OH)2鏈端二醇基團(tuán)之間復(fù)合,PS聚合物通過(guò)B-O鍵接枝到(PDMA-ran-PAPBA)骨架上,從而在油水界面原位形成兩親性可逆共價(jià)接枝共聚物。形成的兩親性可逆共價(jià)接枝共聚物吸附在分散相液滴表面并穩(wěn)定分散相液滴。詳細(xì)研究了聚合物濃度對(duì)乳液形成影響及pH和葡萄糖對(duì)乳液穩(wěn)定性的影響。
[Abstract]:Emulsion is a thermodynamically stable dispersion system formed by emulsification of two incompatible liquids in the presence of emulsifier. The emulsion with reactive deemulsification has important applications in oil recovery, interfacial reaction and other fields. In this paper, a stimulative and responsive emulsifier is constructed based on B-O reversible covalent bond. The stability of emulsion is regulated by the reversibility of B-O covalent bond. Thus, pH and sugar responsive emulsions were prepared. The main contents of this thesis include the following two parts: 1: 1) the stable responsive Pickering emulsion of nuclear dynamic covalent crosslinked polymer nanoparticles. Firstly, the polymer was polymerized by reversible addition of breaking chain transfer (RAFT). Poly (N (N) N-dimethylacrylamide) -b-Poly (acrylaminoboric acid) block polymer was synthesized by the method. In the aqueous solution of the block polymer, the block polymer PDMA-b-PAPBA was synthesized. The polymer nanoparticles with covalent structure and reversible covalent bond crosslinking in PDMA-b-PAPBA were prepared by recombination of the side group of phenoboric acid (PBA) and polyvinyl alcohol (PVA) diol group. CCPNs was used as particle emulsifier and decanol as oil phase. Oil in water Pickering emulsion was prepared with water as a continuous phase. The structure and morphology of B-O dynamic covalent bond and glucose responsive CCPNs changed with the change of pH and glucose concentration. The interfacial activity of CCPNs changed with the change of particle structure and morphology. The stable emulsion pH and glucose-responsive deemulsification properties were given. The stimuli response of CCPNs structure and CCPNs stable Pickering emulsion were studied in detail. Site formation and stable responsive emulsions. Firstly, poly (N- (N-)-dimethylacrylamide)-ran-ran- (polyacrylamide) random copolymers and dihydroxyl-terminated polystyrene (PS)-OH _ (2) were synthesized by RAFT polymerization. The PS(OH)2 and PMA-ran-PAPBA were prepared in a certain amount, respectively. Concentration dissolved in alkaline water and toluene, A stable oil-in-water emulsion was obtained by mixing the two polymer solutions in a certain volume and stirring at high speed and homogeneously. The composite PS polymer was grafted onto the framework of the PDMA-ran-PAPBA with the help of the side group of phenylborate group and the diol group at the end of the chain of PS(OH)2, and the polymer was grafted onto the framework of the PDMA-ran-PAPBA by B-O bond. The amphiphilic reversible covalent graft copolymers were formed at the oil-water interface. The amphiphilic reversible covalent graft copolymers were adsorbed on the surface of dispersed droplets and stabilized the dispersed droplets. The effects of polymer concentration on emulsion were studied in detail. The effects of pH and glucose on the stability of emulsion were investigated.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O648.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 ;Intensified photocatalytic degradation of nitrobenzene by Pickering emulsion of ZnO nanoparticles[J];Particuology;2010年05期

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本文編號(hào)：1688170