| 摘要 |
A polyarylether includes repeating units of the structure IA. - Ph - CO - Ar<1> - CO - Ph - and of the structure IB. - Ar<2> - wherein IA and IB are linked through ether linkages, Ph is phenylene, Ar<1> is a polyaromatic group such as biphenylene and Ar<2> may be Ph or a polyaromatic group wherein two aromatic groups may be linked by - CO - or - SO2 - and at least some of the groups Ar<2> contain - SO2 -. In preferred polymers, at least some of the structures IA are joined to each other or to an Ar<2> group which does not contain -SO2-. The polymers typically have a glass transition temperature of >/= 200 DEG C and a melting temperature of >/= 300 DEG C and preferably </= 430 DEG C. Polymers of this type have enhanced solvent resistance, even when essentially amorphous. |
