Polyether-ether-ketone with improved hydrophilicity and/or thermal stability and preparation method thereof

[0047] (1) Sodium carbonate and potassium carbonate were dried under vacuum at 100°C to remove moisture before use.

[0048] (2) Add 165g of hydroquinone (1.50mol) and 335.6g of 4,4'-difluorobenzophenone to a (3L) four-necked flask equipped with a turbine stirring device, a temperature detector, and a nitrogen inlet Ketone (1.537mol), 1040g diphenyl sulfone (4.770mol), 180.15g anhydrous sodium carbonate (1.70mol), 5.22g anhydrous potassium carbonate (0.038mol), stir, blow nitrogen for 30min, record as system 1.

[0049] (3) Raise the temperature of system 1 to 140°C at a rate of 2°C / min, then raise the temperature to 220°C at a rate of 1°C / min, and keep it for 30 minutes; continue to raise the temperature of system 1 to 300°C, the heating time is 50 minutes, and keep it for 70 minutes.

[0050](4) prepare the reaction flask that is equipped with stirrer and temperature probe in addition, add 6.53g (4-hydroxyphenyl) phosphonic acid (0.0375mol), 3.36g sodium bicarbonate (0.04mo

[0059] The steps are basically the same as in Example 1, except that step (9) is not included to obtain dry granular product B.

[0061] The steps of Example 1 are basically the same, except that steps (4) and (5) are not included to obtain dry granular product C.