Polyaromatic ether‐sulfone‐ketones with fluorosubstituted p‐cyclophane units as crosslinking sites

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Abstract
Polyaromatic either‐sulfone‐ketones containing fluoro‐substituted p‐cyclophane units were prepared from isophthaloyl chloride, terephthaloyl chloride, diphenyl ether, diphenoxydiphenyl sulfone, and a small amount of 1,1,2,2,9,9,10,10‐octafluoro‐[2,2]‐p‐cyclophane (type A) or pseudo‐p‐1,12,2,9,9,10,10‐octafluoro‐[2,2]‐p‐cyclophane bis‐acid chloride (type B) by Friedel‐Crafts‐type polymerization. The p‐cyclophane units were incorporated as crosslinking sites. Crosslinking was achieved by curing polymers at 300–350°C for several days. The polymers obtained, containing 1–10 wt % fluoro‐substituted p‐cyclophane units, were moderately soluble in dichloromethane, DMF, and sulfuric acid with inherent viscosities between 0.4 and 0.6. Laminates on glass fiber were made with excellent thermal stability.

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