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- W2313236563 abstract "We investigated catalytic activities of strong brønsted acids for dehydration polycondensations of dicarboxylic acids and diols, which were carried out at low temperature (<100 °C) under reduced pressure (0.3–3 mmHg). Strong Brønsted acids, bis(perfluoroalkanesulfonyl)imide and perfluoroalkanesulfonic acid, showed higher activity than p-toluenesulfonic acid or rare-earth catalysts at 60 °C. In particular, bis(nonafluorobutanesulfonyl)imide (Nf2NH) showed the highest activity to synthesize not only aliphatic polyester (Mn > 19000) but also aromatic polyester (Mn > 7000). The used Nf2NH was sublimated from the reaction flask during polycondensation, and the sublimate, Nf2NH, was extra pure so that we can reuse the catalyst without loss of the activity in the dehydration polycondensations." @default.
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- W2313236563 date "2012-04-30" @default.
- W2313236563 modified "2023-09-25" @default.
- W2313236563 title "Dehydration Polycondensation of Dicarboxylic Acids and Diols Using Sublimating Strong Brønsted Acids" @default.
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- W2313236563 doi "https://doi.org/10.1021/bm300231d" @default.
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