Patent ID: 8981034
Filing Date: 2015-03-17
Classification: C08G

Abstract:
1. A method for preparing poly(aryl ether ketone) copolymers using quaternary copolycondensation technology, including the following steps: sulfolane is first added into a three-necked bottle equipped with a thermometer, a nitrogen pipe and a stirrer, stirred and heated, after melted the mixture is added in turn with four monomers, 4,4′-difluorobenzophenone, 1,4-bis(4-fluorobenzyl)benzene, hydroquinone and 4,4′-dihydroxybenzophenone, and stirred well until completely dissolved, then added with alkali metal carbonate, which is 1% to 5% more than the sum of hydroquinone and 4,4′-dihydroxybenzophenone in mole number, to the system, and heated up to a temperature of 200 to 230° C. under stirring to complete the first salt-forming reaction by reacting 20 to 40 minutes under constant temperature of 220 to 230° C.; then the temperature is heated up to 250 to 260° C. and the second salt-forming reaction is completed in 20 to 40 minutes under constant temperature of 250 to 260° C., followed by heated up to 300 to 320° C. for starting the polycondensation reaction, and the polymerization reaction is completed in 3 to 4 hours during this phase under the constant temperature of 300 to 320° C.; finally, the above polymer solution is poured into the distilled water at room temperature and cooled into stripy solids, and the solids are crushed and extracted with ethanol to remove the solvent sulfobenzide or sulfolane in the polymer, and then added with deionized water to extract the by-product salts, followed by vacuum drying, wherein the charge ratio of the four monomers is controlled to obtain one of four quaternary copolymers, wherein each one of the four quaternary copolymers contains-structural repeat units PEEK, PEEKK, PEK and PEKEKK in the molecular chain, with one of the repeat units constituting major part of the copolymer obtained and the remaining three of the repeat units constituting minor part of the copolymer obtained, such that the copolymer obtained has equivalent macroscopic properties with a corresponding homopolymer that is constituted solely by the one of the repeat units constituting the major part of the copolymer obtained.