Synthesis of polyamide dendrons bearing pyridine groups as multiple hydrogen bonding parts on the periphery

Abstract

Aromatic polyamide dendrons (G0-G2) having amino groups on the periphery were prepared by divergent method. Reaction of GO aromatic polyamide dendron with isonicotinoyl chloride hydrochloride gave polyamide dendron (G0-2Py) bearing two pyridine groups, The structures of polyamide dendrons were confirmed by IR, 1H, 13C NMR, MALDI-TOF mass spectroscopy, A hydrogen-bonded G0-2Py/poly(acrylic acid) (PAA) 1/2 complex was prepared by mixing G0-2Py with PAA in methanol, followed by removing the solvent. IR spectrum of G0-2Py/PAA 1/2 complex showed chaiacteristic absorptions at 2550 and 1950cm-1 due to hydrogen bonding. A glass transition temperature (Tg) of G0-2Py/PAA 1/2 complex was observed at 121°C by DSC measurement, whereas Tgs of G0-2Py (137°C) and PAA (87°C) disappeared. Tg of the G0-2Py/PAA complex was dependent on the molar ratio ([Donor]/[Acceptor]). Maximum Tg at 121°C was observed at a ratio of 1.