| 主权项 |
1. A proton-conducting polymer membrane based on copolymers comprising (I) polybenzoxazoles and (II) polybenzimidazoles, obtainable by a process comprising the steps of
(i) mixing (a) one or more aromatic diamino dihydroxy compounds with (b) one or more aromatic carboxylic acids or esters thereof comprising at least two acid groups per carboxylic acid monomer,
ormixing one or more aromatic and/or heteroaromatic amino hydroxy carboxylic acids in polyphosphoric acid to form a solution and/or dispersion, (ii) heating the mixture from step (i), to temperatures in the range from 120° C. up to 300° C. and polymerizing until attainment of a polybenzoxazole polymer having an intrinsic viscosity of up to 1.5 dl/g, (iii) mixing (a) one or more aromatic tetraamino compounds with (b) one or more aromatic carboxylic acids or esters thereof comprising at least two acid groups per carboxylic acid monomer,
ormixing one or more aromatic and/or heteroaromatic diamino carboxylic acids in polyphosphoric acid to form a solution and/or dispersion, (iv) heating the mixture from step (iii), to temperatures in the range from 120° C. up to 300° C. and polymerizing until attainment of a polybenzimidazole polymer having an intrinsic viscosity of up to 1.5 dl/g, (v) combining the polybenzoxazole polymer obtained in step (ii) and the polybenzimidazole polymer obtained in step (iv) and heating until attainment of an intrinsic viscosity of more than 1.5 dl/g, to form a polybenzoxazole-polybenzimidazole block polymer, (vi) applying a layer using the mixture according to step (v) to a support or to an electrode, (vii) at least partially hydrolyzing the polyphosphoric acid present in the layer from step (vi) by contacting with water and/or aqueous media, (viii) detaching the self-supporting membrane formed from the support or the electrode. |
