Polymaleimide polymer as well as preparation method and application of polymaleimide polymer

[0055] (1) Synthesis of Substance A

[0056] Add 0.1 mol of 4-(2,5-dioxo-4,5-dihydro-1H-pyrrol-1-yl)benzoyl chloride, 0.1 mol of triethylamine and 0.1 mol of chloroethanol into 2 mol of dichloromethane, React at 0°C for 2 hours to obtain reaction solution B; wash reaction solution B with 2ml of saturated aqueous sodium bicarbonate solution 3 times, then wash with 2ml of 1M hydrochloric acid solution for 3 times, then wash reaction solution B with distilled water until neutral, and then wash with anhydrous Magnesium sulfate was dried, filtered, and the filtrate was taken, concentrated to obtain a concentrated solution, and the concentrated solution was precipitated in 20ml of ether to obtain substance A;

[0057] The structural formula of the reaction is as follows:

[0058]

[0059] (2) Preparation of polymaleimide polymer:

[0060] Add 0.1 mol of substance A in step (1) and 0.1 mol of sodium azide to 2 mol of dimethyl sulfoxide at the same time, and react at 20°C for 6 h...

[0064] (1) Synthesis of Substance A

[0065] Add 0.1mol 4-(2,5-dioxo-4,5-dihydro-1H-pyrrol-1-yl)benzoic acid, 0.2mol sodium p-toluenesulfonate and 0.2mol bromoethanol to 10mol tetrahydrofuran, React at 25°C for 24 hours to obtain reaction solution B; wash reaction solution B with 2ml of saturated aqueous sodium bicarbonate solution 5 times, then wash reaction solution B with 2ml of 1M hydrochloric acid solution for 5 times, then wash reaction solution B with distilled water until neutral, and then use Dry over magnesium sulfate, filter, take the filtrate, concentrate to obtain a concentrated solution, and precipitate the concentrated solution in 3ml of n-hexane to obtain substance A;

[0066] The structural formula of the reaction is as follows:

[0067]

[0068] (2) preparation of polymaleimide polymer:

[0069] Add 0.1 mol of substance A in step (1) and 1 mol of sodium azide to 20 mol of dimethylformamide at the same time, react at 100°C for 72 hours to obtain a reactio...

[0073] (1) Synthesis of Substance A

[0074] Add 0.1mol 2-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl) acetyl chloride, 0.15mol pyridine and 0.15mol chloropropanol to 5mol toluene and react at 15°C After 14 hours, the reaction solution B was obtained; the reaction solution B was washed 4 times with 2 ml of saturated aqueous sodium bicarbonate solution, and then 4 times with 2 ml of 1M hydrochloric acid solution, and then the reaction solution B was washed with distilled water until neutral, and then washed with anhydrous magnesium sulfate Drying, filtering, taking the filtrate, concentrating to obtain a concentrated solution, and precipitating the concentrated solution in 10ml of cyclohexane to obtain substance A;

[0075] The structural formula of the reaction is as follows:

[0076]

[0077] (2) Preparation of polymaleimide polymer:

[0078] 0.1 mol of substance A in step (1) and 0.5 mol of sodium azide were added to 10 mol of tetrahydrofuran at the same time, and reacted at ...