| 摘要 |
The present invention relates to a process for preparing polysulfone, comprising reacting bisphenol monomers with a salt forming agent to form bisphenolate, followed by subjecting the bisphenolate and 4,4′-dihalodiphenyl sulfone to polycondensation to give polysulfone, characterized in that the reaction for forming bisphenolate and the polycondensation are performed in the presence of a composite ionic liquid as the solvent, the composite ionic liquid containing zwitterionic liquid of formula (I) and/or (II) as component A and ionic liquid of formula (III) and/or (IV) as component B, wherein variables are respectively defined in the description of the present invention. The process of the present invention enables a shortened preparation period of polysulfone, particularly a shortened reaction time (including the time of water removal) of the salt forming stage; in addition, the polysulfone thus prepared has an improved molecular weight which is much higher.; |
| 主权项 |
1. A process for preparing polysulfone, comprising reacting bisphenol monomers with a salt forming agent to form bisphenolate, followed by subjecting the bisphenolate and 4,4′-dihalodiphenyl sulfone to polycondensation to give polysulfone, characterized in that the reaction for forming the bisphenolate and the polycondensation are performed in the presence of a composite ionic liquid as the solvent, the composite ionic liquid containing:
A) at least one zwitterionic liquid selected from compounds of the following formulae I and II: wherein, n and m independently from each other are an integer of from 1 to 6; and R is a linear or branched C1-C6 alkyl group, and B) at least one ionic liquid selected from compounds of the following formulae III and IV: wherein, A− represents an anion in the ionic liquid, which is Cl−, Br−, BF4−, PF6−, [CF3SO3]−, (CF3SO2)2N−, CF3COO−, [AlCl4]−, (CF3SO2)2C−, CF3CF2CF2CF2SO3− or CF3CF2CF2COO−; R1 and R3 independently from each other are linear or branched C1-C18 alkyl groups or benzyl; R2 is hydrogen or a linear or branched C1-C4 alkyl group; and R4 is hydrogen, a linear or branched C1-C6 alkyl group, halogen or nitro. |
