High-toughness and high-temperature-resistant polyimide composite material and preparation method thereof
A technology of polyimide and composite materials, which is applied in the field of polyimide composite materials and can solve problems such as poor fracture toughness
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Embodiment 1
[0074] (1) 470.75g (1.6mol) of 2,3,3',4'-biphenyltetraacid dianhydride (a-BPDA) and 99.29g (0.4mol) of 4-phenylethynylphthalamide An acid anhydride (PEPA) was refluxed for 4 hours in a 50wt% ethanol mixture to obtain a homogeneous esterification solution, which was then added to 360.43g (1.8mol) 4,4'-diaminodiphenyl ether (4, 4'-ODA) and 302.95g N, in the mixed solution of N-dimethylacetamide (DMAc), react at room temperature to obtain the precursor solution (n=8) of the thermosetting polyimide matrix resin of solid content 43wt% );
[0075] (2) After the precursor solution of the above-mentioned thermosetting polyimide matrix resin is impregnated with carbon fibers, it is evenly arranged, and after drying to remove the solvent, a prepreg with a content of 36 wt% of the thermosetting polyimide resin is obtained;
[0076] (3) Dissolve 65.62g (0.205mol) of 4,4'-diamino-2,2'-bistrifluoromethylbiphenyl (TFDB) in 623.66g of N,N-dimethylacetamide (DMAc) 88.85g (0.2mol) of 4,4'-(he...
Embodiment 2
[0081] (1) 470.75g (1.6mol) of 2,3,3',4'-biphenyltetraacid dianhydride (a-BPDA) and 132.39g (0.53mol) of 4-phenylethynylphthalamide An acid anhydride (PEPA) was refluxed for 4 hours in a 50wt% methanol mixture to obtain a homogeneous esterification solution, which was then added to 687.75g (1.87mol) of 4,4'-bis(4-aminophenoxy ) biphenyl (BAPB) and 645.45gN, in the mixed solution of N-dimethylformamide (DMF), the precursor solution (n= 6);
[0082] (2) After the precursor solution of the above-mentioned thermosetting polyimide matrix resin is impregnated with carbon fibers, the carbon fibers are evenly arranged, and after drying to remove the solvent, a prepreg with a content of 37wt% of the thermosetting polyimide resin is obtained;
[0083] (3) Dissolve 70.16g (0.202mol) of 9,9'-bis(4-aminophenyl)fluorene (BAFL) in 531.77g of N-methylpyrrolidone (NMP), and add 62.04g of it under nitrogen protection (0.2mol) of 3,3',4,4'-diphenyl ether tetra-acid dianhydride (ODPA) and 0.74g...
Embodiment 3
[0088] (1) 470.75g (1.6mol) of 2,3,3',4'-biphenyltetraacid dianhydride (a-BPDA) and 99.29g (0.4mol) of 4-phenylethynylphthalamide An acid anhydride (PEPA) was refluxed for 4 hours in a 50wt% ethanol mixture to obtain a homogeneous esterification solution, which was then added to 360.43g (1.8mol) 4,4'-diaminodiphenyl ether (4, 4'-ODA) and 206.77g N, in the mixed solution of N-dimethylacetamide (DMAc), the precursor solution (n= 8);
[0089] (2) After the precursor solution of the above-mentioned thermosetting polyimide matrix resin is impregnated with carbon fibers, the carbon fibers are evenly arranged, and after drying to remove the solvent, a prepreg with a content of 35wt% of the thermosetting polyimide resin is obtained;
[0090] (3) Dissolve 53.86g (0.204mol) of 5-amino-1-(4-aminophenyl)-1,3,3-trimethylindan (PIDA) in 477.61g N,N-dimethyl In acetamide (DMAc), under the protection of nitrogen, add 64.45g (0.2mol) of 3,3',4,4'-benzophenone tetra-acid dianhydride (BTDA) an...
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