One-pot synthesis of hydroxyl terminated hyperbranched semi-aromatic Poly(ester-imide)s

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A new kind of hyperbranched semi-aromatic poly(ester-imide)s with hydroxyl terminated groups has been prepared from commercially available 1,2,4-benzenetricarboxylic anhydride (TMA) as the AA′-type aromatic monomer and 3-amino-1,2-propanediol (3APPD), 2-amino-1,3-propanediol (2APPD), N,N-bis(2-hydroxyethyl)ethylenediamine (BHED) as CB 2 -type aliphatic monomers via a simple one-pot melting polymerization method. The effects of synthesis conditions on the structures and properties of the products were investigated in detail. The combination of FTIR, 1 H NMR, 2D NMR, MALDI-FTICR-MS and model reactions have been used to characterize the structures of the obtained polymers. As assessed using thermal measurements, the obtained hyperbranched semi-aromatic poly(ester-imide)s possess low glass transition temperature (≤120 °C) and high thermostability with an onset decomposition temperature ranging from 355 to 420 °C in nitrogen. The products possess abundant terminal hydroxyl functional groups. Hydroxyl values vary between 198 and 248 mg KOH/g depending on the particular precursors used to generate the polymers. The synthesis of hydroxyl terminated hyperbranched semi-aromatic poly(ester-imide)s. • Hyperbranched semi-aromatic poly(ester-imide)s were prepared by one-pot melting polymerization. • HBPEIs possess low T g and high thermostability. • HBPEIs are terminated by abundant hydroxyl function groups. • This synthetic strategy exhibits good fault-tolerant ability for reaction condition.