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- W1997534334 abstract "Abstract Three generations of dendritic-linear copoly(arylene ether)s containing aryl sulfide and aryl sulfone groups, and aryl fluoride terminal functionality, have been synthesized using the divergent approach and an activation/condensation sequence that involves oxidation of 4-fluorophenylthio groups and the displacement of the activated halide moiety by a phenolate ion. A copolymer was synthesized from a relatively high molecular weight bisphenol that contained two 4-fluorophenylthio groups, along with bisphenol-A, and reacted with bis(4-fluorophenyl) sulfone and Cs2CO3. This copolymer was oxidized with H2O2 in formic acid to obtain the linear copoly(arylene ether sulfone) with activated terminal groups. The dendrimer units were built up in a condensation/activation sequence as previously described using a phenol containing two 4-fluorophenylthio groups. All the polymeric products were obtained in relatively high yield (70–97%) and were characterized using NMR, SEC and HPLC. They showed excellent thermal properties (5% weight loss >450 °C by TGA) and narrow polydispersities (1.3–1.6), however, films made from third generation products were very brittle." @default.
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- W1997534334 date "2002-01-01" @default.
- W1997534334 modified "2023-09-26" @default.
- W1997534334 title "Synthesis of dendritic-linear copoly(arylene ether)s from a linear copolymer core" @default.
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- W1997534334 doi "https://doi.org/10.1016/s0032-3861(02)00527-x" @default.
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