Photochemically Cross-linked Poly(aryl ether ketone) Rings

✍ Scribed by Ian Teasdale; Elizabeth C. Harper; Paolo Coppo; Brian Wilson; Michael L. Turner

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 141 KB
• Volume: 27
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200600586

✦ Synopsis

Abstract

Summary: Macrocyclic phenyl ether ketones were prepared via pseudo high dilution condensation. Irradiation of these rings with UV light in a solution containing isopropyl alcohol as hydrogen donor resulted in a photo‐induced reduction of benzophenone to benzopinacol and the formation linked macrocycles. These rings can be heated to undergo ring‐opening polymerization and produce a polymer network or they can be added to a polycondensation reaction to prepare poly(ether ether ketones) with variable degrees of cross‐linking.

Photochemical cross‐linking of PEK rings and ring opening polymerization (n: 2–6). (a) h__ν__, __i__PrOH, DCM; (b) CsF, 260 °C (polymer 3); (c) 4,4′–difluorobenzophenone, hydroquinone, diphenylsulphone, K~2~CO~3~, 260 °C (2% polymer 4; 6% polymer 5).

magnified imagePhotochemical cross‐linking of PEK rings and ring opening polymerization (n: 2–6). (a) h__ν__, __i__PrOH, DCM; (b) CsF, 260 °C (polymer 3); (c) 4,4′–difluorobenzophenone, hydroquinone, diphenylsulphone, K~2~CO~3~, 260 °C (2% polymer 4; 6% polymer 5).