Electrostatic spinning preparation method of cellulose nanofibers having hollow porous structures
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A porous structure, nanofiber technology, applied in the direction of man-made filaments in cellulose solution, chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of cumbersome, multi-time, cumbersome preparation process, etc.
Active Publication Date: 2017-07-28
SICHUAN UNIV
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Problems solved by technology
[0008] 1. The fiber obtained by electrospinning still needs to be calcined to obtain the hollow fiber. This step not only makes the preparation process of the material complicated and cumbersome, but also takes more time and consumes more energy.
[0009] 2. In the process of high-temperature calcination, the polymer matrix PVP is decomposed by high-temperature calcination, resulting in waste of materials
[0010] 3 During the high-temperature calcination process, the decomposition and volatilization of the polymer matrix PVP and the volatilization of the solvent inside the fiber will cause great pollution to the environment
[0011] 4 The polymer matrix PVP in this technology is a synthetic polymer material, which is made from fossil fuel raw materials such as petroleum. The raw materials are non-renewable and cannot be biodegraded, which is easy to cause damage to the environment.
[0012] 5Because after calcination, the polymer matrix is completely decomposed, and what is obtained is pure Fe 2 o 3 fiber, lost the supporting role of PVP
[0016] 1. After obtaining PVAc fibers by electrospinning, it is necessary to spray ZnO on its surface and then calcinate to obtain ZnO hollow fibers. The preparation process of the material is cumbersome and complicated, which consumes time and energy
[0017] 2. In the process of high-temperature calcination, the polymer matrix PVAc is decomposed by high-temperature calcination, resulting in waste of materials
[0018] 3 During the high-temperature calci
Method used
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Embodiment 1
[0056] (1) Prepare mixed cellulose solution.
[0057] Cotton fibers were first activated by soaking in water, methanol, and dimethylacetamide (DMAc) for 1 hour in sequence, and then dissolved in a DMAc / LiCl (92:8) solvent system. Then add a certain amount of iron salts, ferric chloride, ferric nitrate, ferric sulfate, ferric acetate, etc. into the solution, and stir until they are evenly mixed.
[0058] (2) Preparation of functional fibers by electrospinning.
[0059] Fill the mixed cellulose solution into the syringe, and then spin it at a propulsion speed of 0.03mL / min, set the positive and negative voltages to 20KV and -1KV, respectively, and the rotating metal roller as a collection device. The cellulose coagulation bath is an alkaline solution with a certain concentration. Hollow porous nano-hybrid fibers can be produced.
[0060] Figure 1 shows the one-step process of electrospinning to prepare hollow porous nanocellulose fibers loaded with Fe(OH) 3 The SEM picture. ...
Embodiment 2
[0062] Prepare the cellulose solution, then add a certain amount of aluminum salt into the solution, such as aluminum chloride, aluminum sulfate, aluminum nitrate, aluminum acetate, etc., stir until the mixture is uniform, then electrospin, and use the alkali solution as the coagulation bath, you can get Hollow nano-hybrid fibers. All the other processes are the same as in Example 1.
Embodiment 3
[0064] Prepare the cellulose solution, then add a certain amount of magnesium salt, magnesium chloride, magnesium sulfate, magnesium nitrate, magnesium acetate, etc. to the solution, stir until it is evenly mixed, and then electrospin, and use the alkali solution as the coagulation bath to obtain hollow nano-heterosomes. chemical fiber. All the other processes are the same as in Example 1.
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Abstract
The invention belongs to the technical field of electrospinning and provides an electrostatic spinning preparation method of cellulose nanofibers having hollow porous structures. The preparation method comprises dissolving a certain amount of cellulose in a DMAc/LiC solvent system, adding a certain amount of a metal salt into the system, carrying out uniform stirring to obtain a cellulose mixed solution, wherein a mass ratio of DMAc to LiC in the DMAc/LiC solvent system is 92: 8, putting the cellulose mixed solution into a syringe, carrying out spinning at an advance rate of 0.03 mL/min, respectively setting positive and negative voltages to 20 KV and -1 KV, wherein a rotating metal roller is used as a collection device and a certain concentration of an alkaline solution is used as a cellulose coagulation bath, and preparing the cellulose nanofibers having hollow porous structures. The preparation method utilizes a single-spinneret electrospinning one-step method to prepare the cellulose nanofibers having hollow porous structures, is free of after-treatment and is simple and efficient. The cellulose nanofibers having hollow porous structures have very high water passability and excellent mechanical properties and flexibility.
Description
technical field [0001] The invention belongs to the technical field of electrospinning, in particular to a preparation method for electrospinning of cellulose nanofibers with a hollow porous structure. Background technique [0002] One-dimensional nanomaterials have received more and more attention and research due to their excellent physical and optoelectronic properties. One-dimensional nanomaterials include nanorods, nanowires, hollow nanofibers, nanotubes, etc. Among them, hollow nanofibers have the advantages of high porosity and high specific surface area. At the same time, hollow nanofibers can provide sufficient active sites for physical and chemical reactions with the surrounding environment, thereby ensuring high-sensitivity activities and excellent kinetics, making hollow nanofibers ideal for scientific and engineering applications, such as adsorption, catalysis, electrochemistry have great application potential. [0003] Electrospinning is a new type of non-wo...
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