| 摘要 |
A process is provided for producing aromatic polysulfones which contain repeating units of the formula: <IMAGE> (I) wherein each R is ortho to the sulfone, at least one R per polymer chain is an aliphatic or aromatic substituent, a heteroatom or heteroatom-containing group or a metal or metal-containing group, with any remainder thereof being hydrogen, R1 and R2 each represents alkyl or aryl, each Rs is hydrogen, and n is zero or one. The process comprises: (a) metalating (e.g. lithiating) a polysulfone, preferably dissolved in a solvent, containing repeating units of the formula: <IMAGE> (III) wherein R1, R2, Rs and n are as defined above, so as to form a metalated (e.g. lithiated) polymer containing repeating units of the formula: <IMAGE> (II) wherein R1, R2, Rs and n are as defined above, at least one M per polymer chain is metal l(e.g. lithium), with any remainder thereof being hydrogen; and (b) Quenching the metalated (e.g. lithiated) product with an electrophile so as to replace the metal (e.g. lithium) substitution by an aliphatic or aromatic substituent, a hetero atom or heteroatom-containing group, another metal or metal-containing group. The substituted polysulfones (I) are useful materials which exhibit improved or modified physical, mechanical and chemical properties, such as glass transition temperature, hydrophilicity, lipophilicity, solubility, processability or resistance to chemicals. |
