發(fā)布時(shí)間：2018-05-05 03:02

  本文選題：光引發(fā) + 分散聚合��； 參考：《江南大學(xué)》2011年碩士論文

【摘要】：光引發(fā)聚合作為區(qū)別于熱引發(fā)的一種聚合方法,具有設(shè)備簡(jiǎn)單、投資少、安全環(huán)保、容易實(shí)現(xiàn)工業(yè)化生產(chǎn)等優(yōu)點(diǎn),將在聚合物微球的制備中得到應(yīng)用。 本文首先以聚乙烯吡咯烷酮(PVP)為分散劑,2,2-二甲氧基-2-苯基苯乙酮(BDK)為光引發(fā)劑,在乙醇和水(V乙醇/V水=7/3)的混合介質(zhì)中,由紫外(UV)光引發(fā)苯乙烯(St)和甲基丙烯酸甲酯(MMA)進(jìn)行分散共聚,成功得到了P(St-co-MMA)聚合物微球。研究了影響聚合物微球收率及其粒徑的因素。用傅立葉變換紅外光譜(FTIR)、透射電子顯微鏡(TEM)、激光光散射(LLS)對(duì)微球的結(jié)構(gòu)、形態(tài)和粒徑分布進(jìn)行表征,發(fā)現(xiàn)得到的P(St-co-MMA)聚合物微球的粒徑均一,通過(guò)改變聚合反應(yīng)條件可將微球粒徑控制在500-800nm之間,在優(yōu)化的聚合反應(yīng)條件下,聚合物微球的收率可達(dá)到70%以上。為進(jìn)一步研究光引發(fā)聚合,采用十二烷基硫酸鈉(SDS)為乳化劑,BDK或2-羥基-4-(2-羥乙氧基)-2-甲基苯丙酮(Irgacure 2959)為光引發(fā)劑,在水中由UV光引發(fā)St、MMA和丙烯酸(AA)進(jìn)行乳液聚合,成功得到了P(St-co-MMA-co-AA)聚合物微球。研究了引發(fā)劑種類、乳化劑用量等對(duì)反應(yīng)收率和微球粒徑的影響。采用掃描電子顯微鏡(SEM)、LLS對(duì)所得聚合物微球的粒徑與粒徑分布進(jìn)行了表征,發(fā)現(xiàn)聚合物微球的粒徑均一,改變聚合反應(yīng)條件可將聚合物微球的粒徑控制在70-180nm之間,聚合物微球的收率可達(dá)85%以上。 進(jìn)而以硝酸銀(AgNO3)為金屬源,制得的單分散聚合物微球?yàn)檩d體,利用微球表面的羰基基團(tuán)絡(luò)合吸附銀離子(Ag+),在室溫下通過(guò)硼氫化鈉(NaBH4)或紫外光進(jìn)行還原,制備出了負(fù)載有Ag納米顆粒的聚合物復(fù)合微球。通過(guò)紫外-可見(jiàn)光分光光度計(jì)(UV-vis)、X-射線衍射(XRD)、TEM對(duì)復(fù)合微球的形態(tài)等進(jìn)行表征,發(fā)現(xiàn)銀納米顆粒在聚合物微球表面實(shí)現(xiàn)了有效的分散;由NaBH4還原得到的Ag納米顆粒粒徑較小,小于10nm。通過(guò)抗菌實(shí)驗(yàn)發(fā)現(xiàn)復(fù)合微球?qū)鹕咸亚蚓哂辛己玫目咕?復(fù)合微球還具有催化性,其對(duì)亞甲基藍(lán)(MB)的光催化降解率達(dá)到了97%。研究Ag納米顆粒對(duì)表面吸附熒光素(FL)的熒光性能的影響,發(fā)現(xiàn)熒光增強(qiáng)效率隨著Ag納米顆粒濃度的增加而出現(xiàn)最大值。
[Abstract]:Photoinitiated polymerization, as a polymerization method different from thermal initiation, has the advantages of simple equipment, less investment, safety and environmental protection, easy to realize industrial production, and will be applied in the preparation of polymer microspheres. In this paper, polyvinylpyrrolidone (PVP) was first used as a dispersant, 2-dimethoxy-2-phenylacetophenone (BDK) as photoinitiator, in the mixture of ethanol and water / V ethanol / V water (7 / 3). The dispersion copolymerization of styrene (St) and methyl methacrylate (MMA) was carried out by UV photoinitiator UV) and the PnSt-co-MMA-polymer microspheres were successfully prepared. The factors affecting the yield and particle size of polymer microspheres were studied. The structure, morphology and particle size distribution of the microspheres were characterized by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and laser light scattering (LLSs). By changing the polymerization conditions, the particle size of the microspheres can be controlled between 500-800nm and the yield of polymer microspheres can reach more than 70% under the optimized polymerization conditions. In order to further study the photoinitiation polymerization, the emulsion polymerization was carried out using SDS (sodium dodecyl sulfate) as emulsifier (BDK) or 2-hydroxy-4-oxy (2-hydroxyethoxy) -2-methylphenylethylacetone (Irgacure 2959) as photoinitiator in water. The polymer microspheres were successfully obtained. The effects of initiator and emulsifier amount on the yield and particle size of microspheres were studied. The particle size and distribution of polymer microspheres were characterized by scanning electron microscopy (SEM). It was found that the particle size of polymer microspheres was uniform, and the particle size of polymer microspheres could be controlled within the range of 70-180nm by changing the polymerization conditions. The yield of polymer microspheres is over 85%. Then the monodisperse polymer microspheres were prepared by using silver nitrate Agno _ 3 as the metal source and the carbonyl groups on the surface of the microspheres were used to adsorb Ag ~ (2 +) on the surface of the microspheres. At room temperature, the silver ions were reduced by sodium borohydride (NaBH4) or ultraviolet light. Polymer composite microspheres loaded with Ag nanoparticles were prepared. The morphology of the composite microspheres was characterized by UV-vis spectrophotometer (UV-Vis) X-ray diffraction (XRD) and TEM. It was found that the silver nanoparticles dispersed effectively on the surface of polymer microspheres, and the Ag nanoparticles reduced by NaBH4 were smaller in size than 10 nm. The antibacterial experiments showed that the composite microspheres had good antibacterial activity against Staphylococcus aureus and the composite microspheres had catalytic activity, and the photocatalytic degradation rate of the composite microspheres for methylene blue MBs reached 97%. The effect of Ag nanoparticles on the fluorescence properties of surface adsorbed fluorescein (FLL) was studied. It was found that the fluorescence enhancement efficiency of Ag nanoparticles increased with the increase of Ag nanoparticles concentration.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TB383.1

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 宋慧穎;不同脂肪酸丙二醇單酯的酶法合成及性質(zhì)比較[D];江南大學(xué);2012年

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本文編號(hào)：1845878