發(fā)布時(shí)間：2018-01-16 05:09

  本文關(guān)鍵詞：聚苯乙烯微球的改性及其包覆復(fù)合材料的制備和性能研究　出處：《齊魯工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 聚苯乙烯 銀 聚吡咯 中空二氧化硅微球

【摘要】：本文首先對(duì)聚苯乙烯微球的制備和改性進(jìn)行了研究,隨后呈現(xiàn)出了一種新穎的聚苯乙烯/銀/聚吡咯納米復(fù)合材料的制備方法。通過分散聚合法制備出的聚苯乙烯微球的粒徑大小為740nm,對(duì)其進(jìn)行磺化處理以便其能被用做模板去制備聚苯乙烯/銀/聚吡咯納米復(fù)合材料。通過靜電吸附作用將[Ag(NH3)2]+吸附在磺化的聚苯乙烯微球表面,隨后[Ag(NH3)2]+被吡咯單體還原成銀納米粒子,吡咯被氧化聚合成聚毗咯獲得聚苯乙烯/銀/聚毗咯納米復(fù)合材料。復(fù)合材料在有機(jī)染料的還原方面表現(xiàn)出優(yōu)良的催化性能,這說明復(fù)合材料在催化領(lǐng)域有著廣闊的應(yīng)用前景。在實(shí)驗(yàn)過程中,將用于模板的單分散聚苯乙烯微球浸入到濃硫酸中使磺酸基團(tuán)接枝在聚苯乙烯微球表面,之后將磺化聚苯乙烯微球分散在無水乙醇中,隨著新制備的銀氨溶液的加入,在室溫條件下[Ag(NH3)2]+被吸附在聚苯乙烯上制得聚苯乙烯/[Ag(NH3)2]+微球,水洗兩次后,[Ag(NH3)2]+的還原反應(yīng)和吡咯單體的氧化聚合反應(yīng)在聚苯乙烯微球表面同時(shí)進(jìn)行,制得聚苯乙烯/銀/聚吡咯納米復(fù)合材料。本文同時(shí)也呈現(xiàn)出了一種新的制備二氧化硅中空微球的方法。二氧化硅微球包覆在磺化的聚苯乙烯模板微球上,在醇?jí)A溶液中移除模板微球直接制得二氧化硅中空微球。在二氧化硅中空微球的形成過程中,額外的煅燒步驟在該方法中是不需要的,同時(shí)溶解條件是比較溫和的,即不需要高溫也不要長(zhǎng)時(shí)間的溶解移除聚苯乙烯微球。在實(shí)驗(yàn)中,模板微球依然通過分散聚合法制得,制得的單分散聚苯乙烯微球首先在濃硫酸中被磺化處理,隨著氨水催化正硅酸乙酯的水解,二氧化硅包覆在磺化聚苯乙烯微球表面上,這是由于磺酸基基團(tuán)和二氧化硅表面的羥基之間具有較好的相溶性。然而,磺酸基和羥基均帶有負(fù)電荷能夠阻礙二氧化硅/聚苯乙烯微球的形成。為了解決這一問題,我們采用控制磺化度的方法來降低排斥力,以便在二氧化硅/聚苯乙烯復(fù)合微球形成的過程中,極性之間的相溶性起主導(dǎo)作用。在60℃醇?jí)A溶液中在將聚苯乙烯模板微球移除掉獲得二氧化硅中空微球。
[Abstract]:Firstly, the preparation and modification of polystyrene microspheres were studied. A novel method of preparing polystyrene / silver / polypyrrole nanocomposites was presented. The particle size of polystyrene microspheres prepared by dispersion polymerization was 740nm. It was sulfonated so that it could be used as a template to prepare polystyrene / silver / polypyrrole nanocomposites. [Ag(NH3)2] adsorbed on the surface of sulfonated polystyrene microspheres, then. [Ag(NH3)2 was reduced to silver nanoparticles by pyrrole monomer. Polystyrene / silver / polypyrrole nanocomposites were prepared by oxidative polymerization of pyrrole. The composite showed excellent catalytic performance in the reduction of organic dyes. During the experiment, the monodisperse polystyrene microspheres used for template were immersed in concentrated sulfuric acid, and the sulfonic groups were grafted on the surface of polystyrene microspheres. The sulfonated polystyrene microspheres were then dispersed in anhydrous ethanol. With the addition of the newly prepared silver ammonia solution, at room temperature, [Ag(NH3)2] adsorbed on polystyrene to produce polystyrene /. [Ag(NH3)2 microspheres, washed twice, [The reduction reaction of Ag(NH3)2 and the oxidative polymerization of pyrrole monomer were carried out simultaneously on the surface of polystyrene microspheres. Polystyrene / silver / polypyrrole nanocomposites were prepared. A new method of preparing silica hollow microspheres was also presented in this paper. Silica microspheres were coated on sulfonated polystyrene template microspheres. Silica hollow microspheres were directly prepared by removing template microspheres from alkaloid solution. During the formation of silica hollow microspheres, additional calcination steps were not required in this method. At the same time, the dissolution conditions are mild, that is, the polystyrene microspheres need not be dissolved and removed for a long time without high temperature. In the experiment, the template microspheres are still prepared by dispersion polymerization. The monodisperse polystyrene microspheres were first sulfonated in concentrated sulfuric acid. With the hydrolysis of ethyl orthosilicate catalyzed by ammonia silica was coated on the surface of sulfonated polystyrene microspheres. This is due to the better compatibility between the sulfonic groups and the hydroxyl groups on the silica surface. Both sulfonic groups and hydroxyl groups with negative charge can hinder the formation of silica / polystyrene microspheres. In order to solve this problem, we use the method of controlling the degree of sulfonation to reduce the repulsive force. In order to form silica / polystyrene composite microspheres, the compatibility between polarity played a leading role, and the polystyrene template microspheres were removed to obtain silica hollow microspheres in 60 鈩，

本文編號(hào)：1431659