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The preparation of poly(aryl ether ketones) by the use of trifluoromethanesulfonic acid
Author(s) -
Risse Wilhelm,
Sogah Dotsevi Y.,
Boettcher F. Peter
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910440119
Subject(s) - friedel–crafts reaction , alkylation , ether , chemistry , phosphorus pentoxide , aryl , organic chemistry , ketone , acylation , polymer chemistry , electrophilic aromatic substitution , catalysis , alkyl
Two synthetic routes were used for the preparation of aromatic poly(ether ketones): Friedel‐Crafts acylation and aromatic nucleophilic substitution. The first route involved the reaction of diphenyl ether and terephthalic acid dichloride in trifluoromethane‐sulfonic acid. The addition of trifluoromethanesulfonic anhydride or phosphorus pentoxide resulted in increased molecular weights. The second synthetic route involved the synthesis of an amorphous tert ‐butyl‐substituted poly(ether ketone) prepolymer. Subsequently, the tert ‐butyl groups were removed by a reversed Friedel‐Crafts alkylation reaction yielding the crystalline polymer PEEK. The dealkylation reaction was performed in trifluoromethanesulfonic acid. The addition of a tert ‐butyl group acceptor resulted in high dealkylation conversions.