Poly(ether ketone-benzimidazole) copolymer and preparation method thereof
A technology of benzimidazole and copolymer, which is applied in the field of polymer copolymer and its preparation, can solve the problems of heat resistance and molding processing performance limiting the application of polyaryletherketone, and achieve excellent chemical stability and high glass transition temperature , the effect of good thermoplastic processability
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[0030] The present invention provides the preparation method of poly(ether ketone-benzimidazole) copolymer described in above technical scheme, comprises the following steps:
[0031] Under a protective atmosphere, 3,4-diaminodiphenyl ether and an aromatic dicarboxylic acid monomer are polymerized under the action of polyphosphoric acid to obtain a poly(ether ketone-benzimidazole) copolymer;
[0032] The aromatic dicarboxylic acid monomers include isophthalic acid, terephthalic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-dicarboxybenzophenone, 4,4'-dicarboxydiphenyl One of sulfone, 2,2-bis(4-carboxyphenyl)isopropane and 2,2-bis(4-carboxyphenyl)hexafluoroisopropane.
[0033] In the present invention, the 3,4-diaminodiphenyl ether is preferably prepared by a method comprising the following steps:
[0034] (1) Under a protective atmosphere, 5-chloro-2-nitroaniline, phenol and potassium carbonate carry out an ether-forming reaction in an organic solvent to obtain 2-nitro-5-...
Embodiment 1
[0059] Synthesis of 3,4-diaminodiphenyl ether monomer
[0060] In a completely dry 500mL three-neck flask equipped with a water separator, under nitrogen protection, 36.24g (0.21mol) 5-chloro-2-nitroaniline, 18.83g (0.2mol) phenol and 150mL DMAC (N, N-dimethylacetamide). At room temperature, stir magnetically to dissolve completely, then add 30.41 g (0.22 mol) of anhydrous potassium carbonate and 20 mL of toluene. Stir at room temperature for 30 minutes under nitrogen protection, then raise the temperature to 120° C. for 12 hours, then raise the temperature to 140° C. to continue the reaction for 24 hours. After the reaction, cool to room temperature, and pour the reaction solution into 600mL methanol aqueous solution (volume ratio 1:4), to obtain a large amount of yellow solid, repeatedly wash and filter the product alternately with methanol and water, and obtain the crude product at 60°C under vacuum Dry in oven for 10 hours. The final pure product needs to be recrystalli...
Embodiment 2
[0063] Synthesis of Poly(etherketone-benzimidazole) Copolymer
[0064] Add 50.0g polyphosphoric acid (P 2 o 5 The content is 85%) and 1.20g (6mmol) of 3,4-diaminodiphenyl ether. After passing nitrogen for half an hour, the temperature was raised to 80°C for 4 hours to fully dissolve the 3,4-diaminodiphenyl ether, and then cooled to room temperature , add 1.55g (6mmol) 4,4'-diphenyl ether dicarboxylic acid, protect with nitrogen for 0.5h, then raise the temperature to 100°C for 1h to completely dissolve the acid, then raise the temperature to 150°C for 4h, then continue to raise the temperature to 190°C for 20h. After the reaction, the reaction system was cooled to room temperature, then slowly poured into 300mL of ice water, the precipitate was fully washed with 2wt% sodium bicarbonate aqueous solution, then washed with water until neutral, and finally vacuum-dried at 60°C for 10 hours , to obtain poly(ether ketone-benzimidazole) copolymer, which is denoted as poly(ether ket...
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