Method for preparing terpolymer of poly (diphenyl ether sulfone) and poly (diphenyl sulfone)

摘要

A method for preparing series of terpolymer of poly (diphenyl ether sulfone) and poly (diphenyl ether diphenyl sulfone) comprises: adding high temperature organic solvent, stirring and heating; sequentially adding 4,4′-dihydroxydiphenyl, 4,4′-dichlorodiphenyl sulfone and 4,4′-Bis(4-chlorophenyl)sulfonyl-1,1′-biphenyl; after all the monomers are completely dissolved, heating to 100° C. and adding alkali metal carbonate salt-forming agent which is 5-10 mol % more than the amount of 4,4′-dihydroxydiphenyl added, and subsequently adding xylene; continuously heating and salt-forming reaction begins in the system, and controlling the temperature at 190˜210° C.; then heating to 230˜236° C., and maintaining for 3-4 hours to obtain polymer viscous liquid; and refining the polymer viscous liquid to obtain a terpolymer containing different structural units in the molecular chain, wherein the Tg of the terpolymer can be regulated by changing the ratio of the two dichloro-containing monomers.