| 摘要 |
A novel non-aggressive sulfonating process for aromatic polymers is described.The process encompasses:a). dissolving the aromatic polymer in a substantially anhydrous acid selected from the group consisting of concentrated sulfuric acid, chlorosulfonic acid, and oleum,b) adding an organic solvent which is inert under the conditions of the reaction,c) adding a carboxylic anhydride,d) adding a sulfonating agent, ande) carrying out the sulfonation at a temperature below 25° C. and for a time sufficient to achieve the desired degree of sulfonation.The resultant homogeneous products of the process may preferably be used to produce membranes, for example for fuel cell applications |
