静电纺PA6树枝状纳米纤维膜的制备及其性能研究

发布时间：2018-05-30 04:09

本文选题：静电纺丝 + 尼龙6　；参考：《天津工业大学》2017年硕士论文

【摘要】：随着纳米技术与纳米材料的发展,静电纺纳米纤维已经在能源、环境、光电等领域得到了广泛的应用。近年来,很多研究者从大自然获得灵感,具有仿生结构的异形结构纳米纤维,如螺旋状、丝带状、串珠状、多通道管状、多孔蜂窝状及蛛网状等,成为电纺纳米纤维材料的研究热点。自然界的树是一种富含主干和分支的多级结构材料,本文以尼龙6(PA6)为研究对象,通过在PA6/甲酸纺丝液中添加一定量的有机支化盐四丁基氯化铵(TBAC),一步静电纺丝法可成功制备出PA6仿树枝状纳米纤维膜,并采用原位还原法以及浸渍法对纳米纤维膜进行Ag纳米粒子修饰,利用FE-SEM、TEM、FT-IR、XPS等手段对改性后纳米纤维的形貌以及化学结构进行表征,重点考察了Ag改性PA6树枝状纳米纤维膜的抗菌及催化性能。研究结果表明,TBAC加入大大提高了 PA6/甲酸纺丝液电导率,导致电纺射流体中大分子静电斥力增强,在高压电场作用下劈裂加剧,形成树枝状纳米纤维;当PA6质量分数为14%,TBAC添加量为4%,纺丝电压为45 kV,纺丝距离为15 cm,挤出速率为0.1 mL/h时,制得的纳米纤维膜树枝效果最佳。与传统PA6纳米纤维膜相比,树枝状结构纳米纤维膜的力学性能、比表面积以及亲水性都有显著提升,且膜的孔径从1.75 um下降到0.75 um。通过原位还原法制备的Ag/PA6树枝状纳米纤维膜对大肠杆菌以及金黄色葡萄球菌的抑菌圈半径分别为17.34 mm和30.2 mm,抑菌圈半径大于常规Ag/PA6纳米纤维膜的14.03 mm和25.93 mm;0.1 g树枝状纳米纤维膜2 h后对50 mL初始浓度为10 mg/L的亚甲基蓝的降解率为86%,而通过浸渍法得到的Ag/PA6树枝状纳米纤维膜对50 mL初始浓度为10 mg/L的亚甲基蓝的降解率高达98.13%,五次循环以后降解效率仍然达到83.5%。由此可见,树枝状结构纳米纤维膜在抗菌、催化等领域具有良好的应用前景。
[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.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ340.64;TB383.2

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