本文選題：聚倍半硅氧烷 + PSQ-SH微球��； 參考：《江南大學(xué)》2017年碩士論文

【摘要】：聚倍半硅氧烷(PSQ)微球是一類在分子水平上雜化的新型材料,廣泛應(yīng)用于塑料、纖維、涂料、阻燃材料、化妝品、水處理、光學(xué)及生物醫(yī)學(xué)等諸多領(lǐng)域。目前,功能性PSQ微球的制備及其應(yīng)用研究不僅是材料領(lǐng)域的研究熱點(diǎn),同時(shí)也吸引了眾多工業(yè)領(lǐng)域的關(guān)注。本學(xué)位論文圍繞功能性PSQ微球的制備、表征及其應(yīng)用研究,主要開展了以下幾方面的工作:首先,采用改進(jìn)的水解縮合一步法成功制備了粒徑可控的聚甲基倍半硅氧烷(PMSQ)微球和巰基功能化聚倍半硅氧烷(PSQ-SH)微球,制備過程不需要用到有機(jī)溶劑和表面活性劑,并采用多種表征方法對(duì)PMSQ、PSQ-SH微球的結(jié)構(gòu)、形貌及性能進(jìn)行了測(cè)試。研究結(jié)果表明:通過改變油水比、氨水用量、溫度等反應(yīng)條件可以有效地調(diào)控PSQ微球的粒徑及形貌;PSQ微球的形成過程主要包括了有機(jī)三甲氧基硅氧烷自水解、均相成核和核生長(zhǎng)等步驟。PMSQ和PSQ-SH微球均含有半籠型、梯形和網(wǎng)狀結(jié)構(gòu),而且PSQ-SH微球的倍半硅氧烷分子間距比PMSQ微球的大。PMSQ和PSQ-SH微球具有良好的熱穩(wěn)定性和疏水性,隨著巰丙基三甲氧基硅氧烷(MPTMS)用量的增加,PSQ-SH微球的耐熱和疏水性能均有所下降。其次,將PSQ-SH微球用作吸附劑,采用靜態(tài)吸附法,系統(tǒng)研究了PSQ-SH微球?qū)λ芤褐秀y離子的吸附性能。PSQ-SH微球?qū)︺y離子表現(xiàn)出優(yōu)異的吸附性能:25℃下、銀離子初始濃度為0.025mol/L時(shí),PSQ-SH微球?qū)︺y離子的最大吸附容量為750.21 mg/g。PSQ-SH微球?qū)︺y離子的吸附更加吻合Langmuir等溫吸附模型,表明該吸附主要為單分子層吸附;吸附動(dòng)力學(xué)更適合擬二級(jí)動(dòng)力學(xué)吸附模型。吸附熱力學(xué)參數(shù)表明該吸附過程為自發(fā)進(jìn)行的吸熱過程,升溫有利于PSQ-SH微球?qū)︺y離子的吸附。PSQ-SH微球吸附銀離子的過程不僅發(fā)生了化學(xué)離子交換,而且還伴隨有化學(xué)氧化還原的發(fā)生。此外,在Ag+~Cu2+、Ag+~Zn2+、Ag+~Cd2+二元競(jìng)爭(zhēng)吸附體系中,PSQ-SH微球表現(xiàn)出對(duì)銀離子良好的吸附選擇性;吸附-解吸循環(huán)實(shí)驗(yàn)表明PSQ-SH微球具有良好的再生和重復(fù)使用性能。最后,以PSQ-SH微球?yàn)檩d體,采用簡(jiǎn)易的原位還原法成功制備了載納米銀PSQ-SH(Ag/PSQ-SH)復(fù)合微球,制備過程中不需要添加額外的還原劑和穩(wěn)定劑,并系統(tǒng)考察了Ag/PSQ-SH復(fù)合微球的抗菌性能。Ag/PSQ-SH復(fù)合微球的形成主要?dú)v經(jīng)巰基去質(zhì)子化、親電攻擊和銀納米粒子生長(zhǎng)3個(gè)過程。通過改變反應(yīng)時(shí)間、銀氨溶液濃度、體系的pH可以有效地調(diào)控Ag/PSQ-SH復(fù)合微球的形貌。將Ag/PSQ-SH復(fù)合微球用作抗菌劑,以革蘭氏陰性菌大腸桿菌(E.col)和革蘭氏陽(yáng)性菌金黃色葡萄球菌(S.au)作為主要的模型菌株,分別測(cè)定了Ag/PSQ-SH復(fù)合微球?qū).col和S.au的抑菌圈、最小抑菌濃度(MIC)和最小殺菌濃度(MBC),結(jié)果表明:Ag/PSQ-SH復(fù)合微球?qū).col和S.au具有優(yōu)異的抗菌性能,抗菌活性隨著銀納米粒子負(fù)載量的增加而增大。
[Abstract]:Polysiloxane (PSQ) microspheres are a new type of hybrid materials at the molecular level. They are widely used in many fields, such as plastics, fibers, coatings, flame retardants, cosmetics, water treatment, optics and biomedicine. At present, the preparation and application of functional PSQ microspheres is not only a hot topic in the field of materials, but also attracted a great deal of attention. This dissertation focuses on the preparation, characterization and application of functional PSQ microspheres. First, the improved hydrolytic condensation one step method has been used to successfully prepare the particle size controlled polymethylsilsesquioxane (PMSQ) microspheres and Mercapto functionalized polysiloxane (PSQ-SH) microspheres. The structure, morphology and properties of PMSQ and PSQ-SH microspheres are tested by various characterization methods. The results show that the particle size and morphology of PSQ microspheres can be effectively controlled by changing the oil water ratio, the amount of ammonia water and temperature, and the formation process of the PSQ microspheres is the main process. The.PMSQ and PSQ-SH microspheres contain semi cage, trapezoid and reticular structure, and the distance between the PSQ-SH microspheres and the large.PMSQ and PSQ-SH microspheres of the PMSQ microspheres has a good thermal stability and hydrophobicity with the thiol propyl trimethoxy silicon. The heat and hydrophobicity of PSQ-SH microspheres decreased with the increase of the amount of oxyalkane (MPTMS). Secondly, the PSQ-SH microspheres were used as adsorbents. The adsorption properties of PSQ-SH microspheres on the adsorption properties of silver ions in aqueous solution were systematically studied by.PSQ-SH microspheres. The initial concentration of silver ions at 25 centigrade was 0. At 25mol/L, the maximum adsorption capacity of PSQ-SH microspheres to silver ions is 750.21 mg/g.PSQ-SH microspheres, and the adsorption of silver ions is more consistent with the adsorption model of Langmuir isothermal adsorption. It shows that the adsorption is mainly a single molecular layer adsorption, and the adsorption kinetics is more suitable for the quasi two stage kinetic adsorption model. The process of heat absorption is beneficial to the adsorption of silver ions by PSQ-SH microspheres on the adsorption of silver ions by.PSQ-SH microspheres, not only is chemical ion exchange, but also with chemical oxidation reduction. In addition, in the competitive adsorption system of Ag+~Cu2+, Ag+~Zn2+, Ag+~Cd2+ two elements, PSQ-SH microspheres show good adsorption selection of silver ions. The adsorption desorption cycle experiments showed that the PSQ-SH microspheres had good regenerative and reusable properties. Finally, the nano silver PSQ-SH (Ag/PSQ-SH) composite microspheres were successfully prepared by a simple in situ reduction method with PSQ-SH microspheres as the carrier. The reduction agent and stabilizer were not needed in the preparation process, and Ag/PSQ-SH was systematically investigated. The formation of.Ag/PSQ-SH composite microspheres mainly through the sulfhydryl dehydrated, electrophilic attack and the growth of silver nanoparticles in 3 processes. By changing the reaction time, the concentration of silver ammonia solution and the pH of the system can effectively regulate the morphology of the Ag/PSQ-SH composite microspheres. The Ag/ PSQ-SH composite microspheres are used as an antibacterial agent, and gram Yin is used as an antiseptic. As the main model strain, the bacteria Escherichia coli (E.col) and gram-positive Staphylococcus aureus (S.au) were used as the main model strains. The bacteriostasis circle of Ag/PSQ-SH composite microspheres to E.col and S.au, the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) were respectively measured. The results showed that Ag/ PSQ-SH composite microspheres had excellent antibacterial properties to E.col and S.au, and the antibacterial activity of Ag/ PSQ-SH composite microspheres was excellent. The activity increased with the increase of the loading of silver nanoparticles.
【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】：2017
【分類號(hào)】：O634.41

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