本文選題：嵌段共聚物　切入點(diǎn)：聚苯乙烯-聚(4-乙烯基吡啶)　出處：《東華大學(xué)》2017年碩士論文

【摘要】：兩親性嵌段共聚物具有獨(dú)特的微觀相分離行為,類似于小分子表面活性劑,能夠鋪展于液體表面,因此兩親性嵌段共聚物的Langmuir-Blodgett薄膜(LB膜)受到了廣泛的關(guān)注。通過(guò)微觀區(qū)域結(jié)構(gòu)的調(diào)控,可以制備出高度有序排列、尺寸均一的納米薄膜。LB膜豐富的結(jié)構(gòu)形態(tài)和聚集組裝行為也一直是研究的熱點(diǎn)和難點(diǎn)。本文利用Langmuir-Blodgett技術(shù)(LB膜技術(shù))和原子力顯微鏡(AFM)分別對(duì)嵌段共聚物聚苯乙烯-聚(4-乙烯基吡啶)(PS-b-P4VP)的結(jié)構(gòu)形態(tài)及嵌段共聚物聚苯乙烯-聚(4-乙烯基吡啶)/1-芘丁酸(PS-b-P4VP/PBA)共混體系的結(jié)構(gòu)形態(tài)進(jìn)行了研究。采用氯仿作為鋪展溶劑,將PS-b-P4VP和PS-b-P4VP/PBA稀溶液鋪展于空氣與水界面上,待溶劑揮發(fā),研究PS-b-P4VP和PS-b-P4VP/PBA的單分子層聚集體結(jié)構(gòu)和LB膜形貌。本論文具體研究了不同嵌段比和表面壓對(duì)PS-b-P4VP的等溫曲線和LB膜的表面形態(tài)的影響,以及小分子1-芘丁酸(PBA)的加入和濃度的變化對(duì)PS-b-P4VP/PBA體系結(jié)構(gòu)形態(tài)的影響。通過(guò)對(duì)Langmuir單分子層π-A等溫曲線和LB膜原子力顯微鏡圖像的分析,PS-b-P4VP體系中發(fā)現(xiàn)隨著親水段(P4VP)的增加,π-A等溫曲線向右移動(dòng),平均每分子占有面積增加,嵌段共聚物在被壓縮的過(guò)程中出現(xiàn)更多更豐富的結(jié)構(gòu)形態(tài);LB膜形貌也隨著P4VP含量的變化而變化,薄膜形貌由初始的納米片狀、帶狀結(jié)構(gòu)轉(zhuǎn)變成納米條狀、納米點(diǎn)狀結(jié)構(gòu),膜厚隨著P4VP含量的增大而減小。表面壓對(duì)純的PS-b-P4VP聚集組裝結(jié)構(gòu)產(chǎn)生很大的影響,表面壓增大,聚集體排列變得緊密;隨著表面壓的繼續(xù)增大,單層聚集結(jié)構(gòu)遭到破壞,分子發(fā)生堆疊,形成兩層或兩層以上的結(jié)構(gòu)。在PS-b-P4VP中加入PBA小分子后,PBA與PS-b-P4VP間氫鍵的形成,對(duì)親水段較大的單分子層π-A曲線影響較大,曲線向右移動(dòng),平均每分子占有面積增加;加入PBA后聚集體形態(tài)也發(fā)生明顯的變化,原來(lái)的片狀結(jié)構(gòu)轉(zhuǎn)變?yōu)闂l狀結(jié)構(gòu)或棒狀結(jié)構(gòu),這與增加P4VP含量效果一致。隨著PS-b-P4VP/PBA體系濃度的增大,共混物體系LB膜形貌從棒狀結(jié)構(gòu)逐漸變?yōu)橐?guī)整的點(diǎn)狀結(jié)構(gòu),形貌趨于規(guī)整。
[Abstract]:Amphiphilic block copolymers exhibit unique microscopic phase separation behaviors, similar to those of small molecular surfactants, and can be spread over liquid surfaces. Therefore, the Langmuir-Blodgett films of amphiphilic block copolymers have attracted wide attention. The rich structure, morphology and assembly behavior of homogeneous nano-films. LB films have also been a hot and difficult point in the study. In this paper, block copolymers polystyrene were prepared by using Langmuir-Blodgett technique and atomic force microscope (AFM), respectively. The structure and morphology of poly (4-vinylpyridine) PS-b-P4VP) and the structure and morphology of block copolymers PS-b-P4VP- PBA- PS-b-P4VP- PBA-) were studied. The dilute solution of PS-b-P4VP and PS-b-P4VP/PBA was spread on the interface between air and water, and the solvent was volatilized. The structure of monolayer aggregates and the morphology of LB films of PS-b-P4VP and PS-b-P4VP/PBA were studied. The effects of block ratio and surface pressure on the isothermal curves of PS-b-P4VP and the surface morphology of LB films were studied. The effects of the addition and concentration of 1-pyrene butyrate on the structure and morphology of PS-b-P4VP/PBA system were also discussed. By analyzing the isothermal curve of Langmuir monolayer 蟺 -A and the atomic force microscope image of LB film, it was found that PS-b-P4VP system with hydrophilic segment P4VP). The 蟺 -A isothermal curve moves to the right. The average occupied area of each molecule increased, and the morphology of block copolymers changed with the change of P4VP content, and the morphology of block copolymers changed from the initial nano-flake. The film thickness decreases with the increase of P4VP content. The surface pressure has a great effect on the pure PS-b-P4VP aggregation and assembly structure, the surface pressure increases and the aggregate arrangement becomes tight. With the increasing of the surface pressure, the monolayer aggregation structure was destroyed, and the molecules were stacked to form two or more layers of structure. The hydrogen bond between PBA and PS-b-P4VP was formed after the addition of small PBA molecules in PS-b-P4VP. The 蟺 -A curve of monolayer in hydrophilic segment is greatly affected, the curve moves to the right, and the average area per molecule increases, and the morphology of aggregates also changes obviously after adding PBA, and the original lamellar structure is transformed into stripe structure or bar structure. With the increase of the concentration of PS-b-P4VP/PBA, the morphology of LB films of the blends gradually changed from rod-like structure to regular point structure, and the morphology tended to be regular.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O631;TB383.2

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本文編號(hào)：1662685