Disodium 3,3 -disulfonate-4,4 dichlorodiphenyl sulfon

Sulfonated PAES random copolymers can be prepared by the by potassium carbonate mediated direct aromatic nucleophilic substitution polycondensation of disodium 3,3 -disulfonate-4,4 -dichlorodiphenyl sulfone, 4,4 -dichlorodiphenyl sulfone and BP. The condensation reaction proceeds quantitatively to high molecular weight in A-methyl-2-pyrroUdone (NMP) at 190°C. In addition, a monofunctional monomer, 4-tert-butyl-phenol, can be used as an end capping reagent. The phenol functional group has a similar reactivity as biphenol. In this way, the molecular weight can be controlled. 

Sulfonated multi-block PAES copolymers containing phenolphthalein anilide as a cardo group have been prepared [95], The hydrophobic precursor oligomer was prepared using 4,4 -dihydroxydiphenyl sulfone and 4,4 -dichlorodiphenyl sulfone. The hydrophilic oligomer was prepared from disodium-3,3 -disulfonate-4,4 -dicldorodiphenyl sulfone. Sulfonic acid group is added by a post-sulfonahon process. 

---