Aromatic polyethers, polysulfones, and polyketones as laminating resins. IV. Polymers with p‐cyclophane units for crosslinking

Abstract 1,3‐Bis(p‐phenoxybenzenesulfonyl)benzene, 4,4′‐bis(p‐phenoxybenzenesulfonyl)diphenyl ether, and 4,4′‐diphenoxydiphenyl sulfone were polymerized with isophthaloyl or terephthaloyl chlorides in Friedel‐Crafts type polymerizations. These polymers had [2,2]p‐cyclophane units in the backbone, introduced by employing 3,9‐bis(p‐phenoxybenzoyl) [2.2]p‐cyclophane as part of the polyaryl ether component. Thermolysis of the dimethylene bridge of the [2.2]p‐cyclophane monomer produced diradicals which combined across polymer chains to provide crosslinks. p‐Cyclophane polymers with 1,3‐bis‐(p‐phenoxybenzenesulfonyl)benzene showed potential as high performance, thermally stable laminating resins.