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Thermally induced solid‐state synthesis of fluorine‐containing poly(ether oxadiazole)
Author(s) -
Maruyama Yuka,
Maeda Yukihiko,
Wakabayashi Kanji,
Yamazaki Shinichi,
Kimura Kunio
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32391
Subject(s) - polymerization , polymer chemistry , thermal stability , phenylene , ether , nucleophilic aromatic substitution , polymer , chemistry , oxadiazole , materials science , solid state , nucleophilic substitution , organic chemistry
Synthesis of poly[oxy‐(2,3,5,6‐tetrafluoro‐1,4‐phenylene)‐(1,3,4‐oxadiazol‐2‐yl)‐1,4‐phenylene] (F‐PEOz) was examined by nucleophilic aromatic substitution reaction of 2‐(4‐hydroxyphenyl)‐5‐pentafluorophenyl‐1,3,4‐oxadiazole (HPOz). Only low molecular weight F‐PEOz or crosslinked insoluble polymers were obtained by the solution polymerization with bases. In contrast, thermally induced solid‐state polymerization of HPOz potassium salts at 180°C for 1 h gave fully soluble F‐PEOz with the yield of 84% and its reduced viscosity was 0.66 dL g −1 . The longer polymerization time gave insoluble polymers due to the crosslinking reaction even in solid state. The solid‐state polymerization did not undergo topochemically and it proceeded in an amorphous state. The crosslinking reaction was slightly inhibited by the solid‐state polymerization. F‐PEOz exhibited excellent solubility, high T g of 246°C and good thermal stability. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010