Method for preparing carbon nano-tube reinforced bismaleimide resin composite material
A technology of maleimide resin and bismaleimide, which is applied in the field of materials, can solve the problem of difficulty in obtaining uniform and stable composite materials, the addition of carbon nanotubes is easy to agglomerate and settle, and the dispersion of carbon nanotubes is not good enough And other problems, to achieve high modulus, high storage modulus, high impact resistance
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Embodiment 1
[0022] Embodiment 1: the preparation of multi-walled carbon nanotube-g-ethylenediamine-g-nitrophenylmaleimide, its operational route is as follows:
[0023]
[0024] Step 1: Take 400 mg of carboxyl carbon nanotubes and place them in a reaction flask, add 8 g of condensing agent N,N-diisopropylcarbodiimide, and add 20 ml of ethylenediamine, and mix evenly. Reflux in 50ml of N,N dimethylformamide in an oil bath at 120°C for 24h. After the reaction is complete, use absolute ethanol to ultrasonically wash away the excess amine, filter with a microporous membrane (0.45μm in diameter), and repeat the cleaning for several times. The carbon nanotubes were collected until the pH value of the filtrate was neutral, and dried in vacuum at 40° C. for 24 hours to obtain black aminated multi-walled carbon nanotubes.
[0025] Step 2: Take 100 mg of aminated carbon nanotubes obtained in step (1) and place them in a reaction flask, add 5 g of N-phenylmaleimide, add 5 ml of concentrated hydro...
Embodiment 2
[0029] Step 1: Take 200 mg of carboxyl carbon nanotubes and place them in a reaction flask, add 6 g of 1-ethyl-3-dimethylaminopropyl carbodiimide, and add 20 ml of ethylenediamine, and mix evenly. Reflux in 100ml of N,N-dimethylacetamide at 150°C for 8h. After the reaction is complete, use absolute ethanol to ultrasonically wash away the excess amine, filter with a microporous membrane (0.45μm in diameter), and repeat the washing several times until The pH value of the filtrate was neutral, and the carbon nanotubes were collected and vacuum-dried at 40° C. for 24 hours to obtain black aminated multi-walled carbon nanotubes.
[0030] Step 2: Take 100 mg of aminated carbon nanotubes obtained in step (1) and place them in a reaction flask, add 3 g of maleimide, add 5 ml of glacial acetic acid, and use 50 ml of ether as a solvent, and reflux at 40 ° C for 5 h. After the reaction is completed, , filtered through a metafluoride membrane with a pore size of 0.45 μm, and washed with w...
Embodiment 3
[0034] Step 1: Take 200 mg of carboxyl carbon nanotubes and place them in a reaction flask, add 6 g of 1-ethyl-3-dimethylaminopropyl carbodiimide, and add 20 g of triethylenetetramine, in 100 ml of N, N-dimethyl Acetamide was refluxed at 150°C for 8 hours. After the reaction was completed, the excess amine was washed away by ultrasound with absolute ethanol, filtered with a microporous membrane (0.45 μm in diameter), and washed several times until the pH value of the filtrate was neutral. The carbon nanotubes were vacuum-dried at 40° C. for 24 hours to obtain black aminated multi-walled carbon nanotubes.
[0035] Step 2: Take 100 mg of aminated carbon nanotubes obtained in step (1) and place them in a reaction flask, add 3 g of maleimide, add 1 ml of glacial acetic acid, and use 50 ml of N, N-dimethylformamide as a solvent. Reflux at ℃ for 5 hours. After the reaction is completed, filter with a metafluoride membrane with a pore size of 0.45 μm, and wash with water until the fi...
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