静电纺丝制一维二氧化硅纳米材料

发布时间：2018-04-15 14:15

本文选题：静电纺丝 + 二氧化硅　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：一维材料的独特性能和广泛的应用,近年来已经引起了相当大的关注。各种各样的制造方法用来制备一维结构,如纤维、纳米管等等。Si O2一维纤维是一种具有较大长径比的纳米级材料,但是其纤细的纤维物理化学结构导致材料具有较高脆性,及亲水性,严重制约该材料实际应用。因此,对Si O2纤维有效的柔韧化具有重要的研究与实用价值。静电纺丝技术提供了一种高效的方法来生产连续的直径从几纳米到几个微米的一维结构,材料的润湿性是另一个重要的特性,并在许多实际应用中扮演着一个关键的角色。通过添加不同的试剂与TEOS混合作为前驱体进行静电纺丝,得到二氧化硅纤维具有良好特性,又融入了自身很多优异的性能。本论文综合考虑了静电纺丝技术和二氧化硅纤维的特点,以TEOS制得二氧化硅纤维为模板,制得多组不同工艺参数纤维,并对其组织结构与力学行为性能进行表征和分析。羟基基团链与分子主干上可改变材料的湿润性,TEOS含有亲水的羟基基团在其主链。TMCS是最长用的分子修饰剂,其可引入疏水基团-Si-(CH3)3以增强材料疏水的能力,但传统的修饰方法复杂不适合大规模工业生产。本实验可通过将TEOS和TMCS共同作为前驱体,用一步化学方法将疏水基团修饰于二氧化硅分子主链,通过添加TMCS可以改善二氧化硅纤维的疏水性能达到超疏水纤维材料。全氟化磺酸酯Nafion中一种阳离子交换剂。起离子交换作用的是磺酸基,对憎水性阳离子有极好的选择性。本实验寻求通过添加全氟化磺酸酯Nafion利用静电纺丝方法制备力学性能良好且具有超疏水性能的聚合物二氧化过纤维,并使本身易碎的纤维柔韧性大大加强。以能量模型研究一维有序纤维的形成机理,理想良导体接收装置可以将所有动能和静电能转化为弹性势能,研究了相关参数对一维有序纤维周期性结构密度的影响。
[Abstract]:The unique properties and wide applications of one-dimensional materials have attracted considerable attention in recent years.All kinds of fabrication methods are used to prepare one-dimensional structure, such as fibers, nanotubes and so on. SiO2 one-dimensional fiber is a kind of nanoscale material with large aspect ratio, but its fine physical and chemical structure of fiber leads to its high brittleness.And hydrophilicity, which seriously restricts the practical application of the material.Therefore, the effective flexibility of Sio _ 2 fiber has important research and practical value.Electrospinning provides an efficient way to produce one-dimensional structures with continuous diameters ranging from several nanometers to several microns. The wettability of materials is another important characteristic and plays a key role in many practical applications.By adding different reagents and TEOS as precursors for electrostatic spinning, the silica fiber has good properties and many excellent properties.In this paper, the electrospinning technology and the characteristics of silica fiber are considered synthetically. Using TEOS as template, several groups of fibers with different process parameters are prepared, and their microstructure and mechanical properties are characterized and analyzed.The wettability of the hydroxy group chain and the molecular trunk can be changed. TEOS contains hydrophilic hydroxyl group. TMCS is the longest molecular modifier in its main chain, and it can introduce hydrophobic group -Si-CH3 to enhance the hydrophobic ability of the material.However, the traditional modification method is not suitable for large-scale industrial production.By using TEOS and TMCS as precursors, the hydrophobic group can be modified into the main chain of silica by one-step chemical method. The hydrophobicity of silica fiber can be improved by adding TMCS to the superhydrophobic fiber material.A cationic exchange agent in perfluorinated sulfonate Nafion.Sulfonic acid groups act as ion exchange groups and have excellent selectivity for hydrophobic cations.In this experiment, the addition of perfluorinated sulfonic acid ester (Nafion) was used to prepare polymer peroxide fibers with good mechanical properties and superhydrophobic properties by electrostatic spinning, and the flexibility of the fragile fibers was greatly enhanced.The energy model is used to study the formation mechanism of one-dimensional ordered fiber. The ideal good conductor receiver can convert all kinetic energy and electrostatic energy into elastic potential energy. The influence of relevant parameters on the periodic structure density of one-dimensional ordered fiber is studied.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TQ340.64

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