Method for preparing nanofiber containing pore structure
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A nanofiber and pore structure technology, which is applied in fiber treatment, fiber chemical characteristics, spinning solution preparation, etc., can solve the problems of nanofibers with no pore structure, etc., and achieve the effect of simple and fast preparation process
Inactive Publication Date: 2011-05-25
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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Problems solved by technology
At present, there are no relevant reports on the preparation of porous nanofibers by chemical formula foaming method.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Embodiment 1
[0020] (1) prepare the DMF solution of 10wt% PAN, get the NaHCO of 2wt% of polymer content 3 Disperse in the polymer solution, stir vigorously, stand still, and spin after the air bubbles are eliminated;
[0021] (2) Add the spinning solution prepared in step 1 into the syringe, adjust the voltage to 25kV, and the distance from the nozzle to the receiver is 10cm. Turn on the spinning device to obtain ultra-fine nanofibers on the collecting device;
[0022] (3) Immerse the nanofiber prepared in step 2 in 5% dilute hydrochloric acid, take it out after 24 hours, dry it in an oven, and observe the fiber morphology with a scanning electron microscope.
Embodiment 2
[0024] (1) prepare the DMF solution of 15wt% PAN, get the 5wt% (NH 4 )HCO 3 Disperse in the polymer solution, stir vigorously, stand still, and spin after the air bubbles are eliminated;
[0025] (2) Add the spinning solution prepared in step 1 into the syringe, adjust the voltage to 25kV, and the distance from the nozzle to the receiver is 10cm. Turn on the spinning device to obtain ultra-fine nanofibers on the collecting device;
[0026] (3) Immerse the nanofiber prepared in step 2 in 2% acetic acid, take it out after 24 hours, dry it in an oven, and observe the fiber morphology with a scanning electron microscope.
Embodiment 3
[0028] (1) prepare the DMF solution of the PS of 20wt%, get the NaHCO of 1wt% of polymer content 3 Disperse in the polymer solution, stir vigorously, stand still, and spin after the air bubbles are eliminated;
[0029] (2) Add the spinning solution prepared in step 1 into the syringe, adjust the voltage to 25kV, and the distance from the nozzle to the receiver is 10cm. Turn on the spinning device to obtain ultra-fine nanofibers on the collecting device;
[0030] (3) Immerse the nanofiber prepared in step 2 in 8% dilute hydrochloric acid, take it out after 24 hours, dry it in an oven, and observe the fiber morphology with a scanning electron microscope.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract
The invention belongs to the technical field of high polymer material, relating to a method for preparing nanofiber containing a polymer pore structure, wherein the pore structure is formed on the fiber by a chemical reaction foaming method. The method comprises the following steps of: dispersing the inorganic salt, capable of discharging gas by reaction, in polymer solution, preparing super fine nanofiber by a high pressure static spinning method, immerging the obtained fiber in reaction solution, reacting the inorganic salt in the fiber, discharging the gas, and forming the pore structure on the fiber. The method has the advantages of obtaining the pore structure-containing nanofiber with controllable aperture number and uniform distribution, greatly increasing the specific surface area of the nanofiber and widening the application range of the nanofiber prepared by the electric spinning method. The prepared fiber has high application value in releasing medicine, carrier of catalyst, filtering absorbing material and the like. The method of the invention is wide in application range and can be directly applied to preparing the pore structure-containing nanofiber of a plurality of materials such as PS (polystyrene), PMMA (polymethyl methacrylate), PU (polyurethane), etc.
Description
technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a preparation method of polymer pore structure nanofibers. Background technique [0002] Due to its high surface area-to-volume ratio, nanofibers have high application value in biomedicine, tissue engineering, and filtration. Electrospinning technology is a simple and effective method to prepare nanofibers. It is the use of static electricity to make the polymer solution with static electricity, and the effect of electrostatic force in the electrostatic field. When the electrostatic voltage exceeds the critical value, the electrostatic force is sufficient to overcome the surface tension of the polymer solution, thereby generating a jet. At the same time, with the volatilization of the solvent, the jet solidifies to form ultrafine nanofibers. The preparation of nanofibers with pore structures on the surface or inside can greatly increase the surface area-to-volume ratio ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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