초록 ▼

Sulfonated polyimides and polyamic acids, particularly polyetherimides, are prepared by reacting the unsulfonated polymer with a mild sulfonating agent. Illustrative sulfonating agents are the complexes of sulfur trioxide and trialkyl or triaryl phosphates, especially the sulfur trioxide-triethyl ph

Sulfonated polyimides and polyamic acids, particularly polyetherimides, are prepared by reacting the unsulfonated polymer with a mild sulfonating agent. Illustrative sulfonating agents are the complexes of sulfur trioxide and trialkyl or triaryl phosphates, especially the sulfur trioxide-triethyl phosphate complex having a molar ratio of sulfur trioxide to triethyl phosphate of 2:1.

대표청구항 ▼

A sulfonated polymer comprising structural units having formula I in the drawings, wherein M is one equivalent of a cation; Q is a divalent radical comprising at least one aromatic ring substituted with at least one activating group toward electrophilic aromatic substitution; R1 is an aromatic hydro

A sulfonated polymer comprising structural units having formula I in the drawings, wherein M is one equivalent of a cation; Q is a divalent radical comprising at least one aromatic ring substituted with at least one activating group toward electrophilic aromatic substitution; R1 is an aromatic hydrocarbon radical containing about 6-20 carbon atoms or a halogenated derivative thereof, an alkylene or cycloalkylene radical containing about 2-20 carbon atoms, or a bis-alkylenepoly(dialkylsiloxane) radical; X is OH and Y is NH, or X and Y taken together are N.