A kind of preparation method of beaded nanofiber

A nanofiber and bead-like technology, which is applied in the field of beaded nanofiber preparation, can solve the problems of poor bonding of inorganic nanoparticles to the interface between inorganic nanoparticles and polymer matrix, uncontrollable position of inorganic nanoparticles, poor dispersion of inorganic nanoparticles, etc. , to achieve the effect of controllable fiber structure, excellent dispersion and good combination

Active Publication Date: 2016-04-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the traditional method of preparing beaded nanofibers by electrospinning technology using a solution composed of inorganic nanoparticles, polymer matrix and organic solvent has the following disadvantages: the dispersion of inorganic nanoparticles in organic solvents is poor, and the prepared nanofibers Irregular fiber morphology, uncontrollable position of inorganic nanoparticles in nanofibers, severe agglomeration of inorganic nanoparticles and poor interfacial bonding between inorganic nanoparticles and polymer matrix

Method used

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  • A kind of preparation method of beaded nanofiber
  • A kind of preparation method of beaded nanofiber

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Experimental program
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Effect test

Embodiment 1

[0031] Absolute ethanol, N,N-dimethylformamide (DMF), and tetrahydrofuran (THF) are all produced by Beijing Chemical Plant; silane coupling agent KH550 and cuprous bromide are produced by AJohnsonMattheyCompany; α-bromoisobutyryl bromide It is produced by SIGMA-ALDRICHCompany; pentamethyl-diethyltriamine (PMDETA) is produced by Tixiai (Shanghai) Chemical Industry Development Co., Ltd.; methyl methacrylate is produced by Tianjin Fuchen Chemical Reagent Factory.

[0032] step 1

[0033] Take 1ml of anhydrous acetic acid and 49ml of ethanol and mix them uniformly as a solvent, add 1ml of silane coupling agent KH550, and then add an aqueous solution of silicon dioxide with a particle size of 300nm. After ultrasonic dispersion for 30 minutes to mix the solution uniformly, the reaction was carried out at 50° C. for 24 hours. After the reaction was complete, the solution was taken out and centrifuged in a centrifuge. The rotation speed is 4000r / min, and the separation is performed ...

Embodiment 2

[0043] Prepare SiO according to step 1-step 2 in embodiment 1 2 -Br

[0044] step 3

[0045] Take 0.25g of ground SiO 2 -Br was dissolved in 18ml DMF, 8ml MMA, 0.08ml PMDETA were added. Ultrasonic dispersion was performed for 30 minutes, and nitrogen gas was passed through for 20 minutes. Finally, 0.027g of CuBr was added, and the reaction was sealed at 100°C for 60 minutes. After the reaction was completed, the solution was transferred to 500 ml of absolute ethanol for precipitation. After the supernatant has no floating silica, change to 500ml of absolute ethanol for precipitation, and repeat the operation 5 times. After precipitation, centrifuge in a centrifuge. The rotation speed is 4000r / min, and the separation is performed twice, 20 minutes each time, and the washing liquid added is ethanol. After centrifugation, the product was stored in DMF solvent to obtain wet SiO 2 - PMMA, the molecular weight of the grafted PMMA is 171,000.

[0046] step 4

[0047] SiO in...

Embodiment 3

[0051] Prepare SiO according to step 1-step 2 in embodiment 1 2 -Br.

[0052] step 3

[0053] Take 0.25g of ground SiO 2 -Br was dissolved in 18ml of DMF, 8ml of styrene, 0.08ml of PMDETA were added. Ultrasonic dispersion was performed for 30 minutes, and nitrogen gas was passed through for 20 minutes. Finally, 0.027g of CuBr was added, and the reaction was sealed at 100°C for 20 minutes. After the reaction was completed, the solution was transferred to 500 ml of absolute ethanol for precipitation. After the supernatant has no floating silica, change to 500ml of absolute ethanol for precipitation, and repeat the operation 5 times. After precipitation, centrifuge in a centrifuge. The rotation speed is 4000r / min, and the separation is performed twice, 20 minutes each time, and the washing liquid added is ethanol. After centrifugation, the product was stored in DMF solvent to obtain wet SiO 2 -PS, the molecular weight of the grafted PS is 52,000.

[0054] step 4

[0055...

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Abstract

The invention discloses a preparation method of a beaded nanofiber, and belongs to the field of preparation of nanofibers. The method comprises the following steps: firstly, grafting functional groups on inorganic nanoparticles; grafting a high-molecular polymer on the surfaces of the functional inorganic nanoparticles by a chemical polymerization method; and finally, preparing the beaded organic / inorganic nanoparticle fiber by adopting an electrospinning technique. The nanofiber prepared by the method has the advantages that the fiber structure is controllable, the nanoparticles are evenly dispersed in the fiber, the nanoparticle and the polymer interfaces are well combined and the like, the problems that positions of the inorganic nanoparticles are uncontrollable, the nanoparticles are seriously agglomerated, interface combination between an organic phase and an inorganic phase is poor and the like in an organic / inorganic nanoparticle fiber prepared by adopting the traditional method are solved, and a new idea and a new method are provided for preparation of the nanofiber containing the inorganic nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of nanofiber preparation, and mainly relates to a method for preparing beaded nanofibers. Background technique [0002] In a narrow sense, nanofibers refer to ultrafine fibers with a diameter of nanometer scale. In a broad sense, they include nanoscale and long-length linear materials, and fibers that are modified by filling nanoparticles into ordinary fibers. Nanofibers have been widely used in various fields due to their advantages such as high specific surface area and high porosity. At present, there are many methods for preparing nanofibers, including pulling electrospinning, template synthesis, phase separation, self-assembly and so on. Among them, the electrospinning method is widely used due to its advantages of simple operation, wide application range, and relatively high production efficiency. [0003] In recent years, inorganic nanoparticles / organic polymer nanofibers with beaded morphology have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/28D01D1/02D01D5/00C08F292/00
Inventor 贾晓龙杨光杨小平李武胜蔡晴
Owner BEIJING UNIV OF CHEM TECH
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