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

Abstract

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.