本文選題：靜電紡絲 + 尼龍6��； 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著納米技術(shù)與納米材料的發(fā)展,靜電紡納米纖維已經(jīng)在能源、環(huán)境、光電等領(lǐng)域得到了廣泛的應(yīng)用。近年來,很多研究者從大自然獲得靈感,具有仿生結(jié)構(gòu)的異形結(jié)構(gòu)納米纖維,如螺旋狀、絲帶狀、串珠狀、多通道管狀、多孔蜂窩狀及蛛網(wǎng)狀等,成為電紡納米纖維材料的研究熱點(diǎn)。自然界的樹是一種富含主干和分支的多級(jí)結(jié)構(gòu)材料,本文以尼龍6(PA6)為研究對(duì)象,通過在PA6/甲酸紡絲液中添加一定量的有機(jī)支化鹽四丁基氯化銨(TBAC),一步靜電紡絲法可成功制備出PA6仿樹枝狀納米纖維膜,并采用原位還原法以及浸漬法對(duì)納米纖維膜進(jìn)行Ag納米粒子修飾,利用FE-SEM、TEM、FT-IR、XPS等手段對(duì)改性后納米纖維的形貌以及化學(xué)結(jié)構(gòu)進(jìn)行表征,重點(diǎn)考察了Ag改性PA6樹枝狀納米纖維膜的抗菌及催化性能。研究結(jié)果表明,TBAC加入大大提高了 PA6/甲酸紡絲液電導(dǎo)率,導(dǎo)致電紡射流體中大分子靜電斥力增強(qiáng),在高壓電場(chǎng)作用下劈裂加劇,形成樹枝狀納米纖維;當(dāng)PA6質(zhì)量分?jǐn)?shù)為14%,TBAC添加量為4%,紡絲電壓為45 kV,紡絲距離為15 cm,擠出速率為0.1 mL/h時(shí),制得的納米纖維膜樹枝效果最佳。與傳統(tǒng)PA6納米纖維膜相比,樹枝狀結(jié)構(gòu)納米纖維膜的力學(xué)性能、比表面積以及親水性都有顯著提升,且膜的孔徑從1.75 um下降到0.75 um。通過原位還原法制備的Ag/PA6樹枝狀納米纖維膜對(duì)大腸桿菌以及金黃色葡萄球菌的抑菌圈半徑分別為17.34 mm和30.2 mm,抑菌圈半徑大于常規(guī)Ag/PA6納米纖維膜的14.03 mm和25.93 mm;0.1 g樹枝狀納米纖維膜2 h后對(duì)50 mL初始濃度為10 mg/L的亞甲基藍(lán)的降解率為86%,而通過浸漬法得到的Ag/PA6樹枝狀納米纖維膜對(duì)50 mL初始濃度為10 mg/L的亞甲基藍(lán)的降解率高達(dá)98.13%,五次循環(huán)以后降解效率仍然達(dá)到83.5%。由此可見,樹枝狀結(jié)構(gòu)納米纖維膜在抗菌、催化等領(lǐng)域具有良好的應(yīng)用前景。
[Abstract]:With the development of nanotechnology and nanomaterials, electrospun nanofibers have been widely used in the fields of energy, environment, photoelectricity and so on. In recent years, many researchers have been inspired by nature, with bionic structures of special-shaped nanofibers, such as spiral, silk ribbon, bead, multi-channel tube, porous honeycomb and cobwebs, etc. It has become the research hotspot of electrospun nanofiber materials. The natural tree is a kind of multilevel structural material rich in trunk and branch. In this paper, nylon 6 (PA6) is used as the research object. By adding a certain amount of organic branching salt to the spinning solution of PA6/ formic acid, the PA6 dendritic nanofiber membrane can be successfully prepared by one step electrostatic spinning. The nanofibers were modified with Ag nanoparticles by in-situ reduction and impregnation. The morphology and chemical structure of the modified nanofibers were characterized by FE-SEMMA-TEMT-IRX XPS. The antibacterial and catalytic properties of Ag modified PA6 dendritic nanofibers were investigated. The results show that the conductivity of PA6/ formic acid spinning solution is greatly improved, which leads to the enhancement of electrostatic repulsion force of macromolecules in the electrospun jet, and the splitting under the action of high voltage electric field, resulting in the formation of dendritic nanofibers. When the mass fraction of PA6 is 14 and TBAC is 4, the spinning voltage is 45kV, the spinning distance is 15 cm, and the extrusion rate is 0.1 mL/h, the best branch effect is obtained. Compared with the traditional PA6 nanofiber membrane, the mechanical properties, specific surface area and hydrophilicity of the dendritic nanofiber membrane were significantly improved, and the pore size of the membrane decreased from 1.75um to 0.75um. The bacteriostasis radius of Ag/PA6 dendritic nanofiber membrane prepared by in situ reduction method against Escherichia coli and Staphylococcus aureus was 17.34 mm and 30.2 mm, respectively. The inhibitory circle radius was greater than that of the conventional Ag/PA6 nanofiber membrane at 14.03 mm and 25.93 mm / 0. 1 g tree. The degradation rate of 50 mL methylene blue with initial concentration of 10 mg/L was 86% by dendritic nanofiber membrane 2 h later, while the degradation rate of methylene blue with 50 mL initial concentration of 10 mg/L on Ag/PA6 dendritic nanofiber membrane obtained by impregnation method was as high as that of 50 mL methylene blue with initial concentration of 10 mg/L. After five cycles, the degradation efficiency was still 83.5%. It can be seen that dendritic nanofiber membrane has a good application prospect in antibacterial, catalytic and other fields.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ340.64;TB383.2

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本文編號(hào)：1953847