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Polyaromatic ether‐ketones were prepared from diphenyl ether, isophthaloyl dichloride, and small amounts of 2,6‐, 2,7‐, 1,5‐, and 1,8‐dicarboxylic acid chloride of biphenylene, respectively, by Friedel–Crafts reaction. Biphenylene units were incorporated as crosslinking sites. Crosslinking is achieved by curing the polymers at 310–350°C for several hours. While the uncured resins are soluble in concentrated sulfuric acid, the fully crosslinked polymers are completely insoluble.
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Sutter et al. (1982) studied this question.
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