A kind of double helical carbon fiber and preparation method thereof
A double helix, carbon fiber technology, which is applied in the field of carbon fiber materials and its preparation, can solve the problems of uncontrollable carbon fiber structure dispersion uniformity, uncontrollable carbon fiber microstructure and morphology, and difficulty in realizing industrialized production, etc. The effect of low cost and easy availability of raw materials
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[0034] In the embodiment of this description, the preparation method of the double helical carbon fiber includes:
[0035] Preparation of precursor carbon source: Dissolve trimesene carboxylic acid and urea in a solvent, put them in a reaction kettle, transfer the reaction kettle to an oven for heating, after the reaction is completed, cool, centrifuge, wash and dry to obtain a precursor carbon source source;
[0036] Carbonization: Put the precursor carbon source in a quartz boat, gradually heat up to the carbonization temperature, carry out carbonization under a constant temperature inert atmosphere, cool to room temperature, collect the solid phase, and obtain double-helical carbon fibers.
[0037] Wherein, the feeding molar ratio of trimethylene formic acid and urea is 0.1:1-1:1, preferably 0.5:1-1:1, particularly preferably 0.2:1, 0.4:1, 0.5:1, 0.6:1, 0.7: 1, 0.8:1, 0.9:1, 1:1.
[0038] In the above method, the heating temperature is 60-140°C, preferably 80-120°C, more ...
Embodiment 1
[0040] Dissolve 0.1mmol of m-tribenzoic acid and 0.1mmol of urea in 20ml of N,N-dimethylformamide and 20ml of absolute ethanol respectively. After ultrasonically dissolving fully, mix them evenly and transfer them to the reactor. Transfer the reactor to Heated to 100°C in an oven for 6 hours to stop the reaction, naturally cooled to room temperature, centrifuged, washed, and dried at 60°C to obtain a precursor carbon source. Then put the precursor carbon source into the quartz boat, raise the temperature to 900°C at a rate of 5°C / min, and carbonize it in a nitrogen atmosphere at a constant temperature for 4 hours, then stop the reaction, cool to room temperature naturally, collect the solid phase, and obtain a double helix carbon fiber.
[0041] figure 1It is a transmission electron microscope picture of the obtained double helical carbon fiber at a resolution of 50 nm. The measured carbon chain diameter is about 60nm, the length is greater than 10μm, and the single chain di...
Embodiment 2
[0048] Dissolve 0.1mmol of tribenzoic acid and 0.2mmol of urea in 20ml of N,N-dimethylformamide and 20ml of absolute ethanol respectively. Heated to 80°C in an oven for 6 hours to stop the reaction, naturally cooled to room temperature, centrifuged, washed, and dried at 60°C to obtain a precursor carbon source. Then put the precursor carbon source into the quartz boat, raise the temperature to 800°C at a rate of 10°C / min, and conduct carbonization treatment in a constant temperature argon atmosphere for 4 hours, then stop the reaction, cool naturally to room temperature, collect the solid phase, and obtain a double helix shaped carbon fiber.
[0049] image 3 It is a transmission electron microscope image of the obtained double helical carbon fiber at a resolution of 100 nm. Among them, the measured carbon chain diameter is about 62nm, the length is greater than 10 μm, and the single chain diameter is about 20nm. It can be seen from the figure that the double helix structur...
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