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- W2071447797 abstract "Abstract 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" @default.
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- W2071447797 date "2010-06-28" @default.
- W2071447797 modified "2023-10-18" @default.
- W2071447797 title "Thermally induced solid-state synthesis of fluorine-containing poly(ether oxadiazole)" @default.
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- W2071447797 doi "https://doi.org/10.1002/app.32391" @default.
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