Poly(amine-amide-imide)s bearing pendent N-carbazolylphenyl moieties: Synthesis and electrochromic properties
Journal
Macromolecular Chemistry and Physics
Journal Volume
207
Journal Issue
17
Pages
1589-1598
Date Issued
2006
Author(s)
Abstract
A series of novel poly(amine-amide-imide)s with pendent N-carbazolylphenyl units that have inherent viscosities of 0.45-0.66 dL · g-1 are prepared from various aromatic bis(trimellitimide)s and the new carbazole-based aromatic diamine, 4,4′-diamino-4″-N-carbazolyltriphenyl-amine, by direct polycondensation. All the polymers are readily soluble in polar organic solvents. Flexible, amorphous, and deep reddish films of poly(amine-amide-imide)s can be obtained by solution casting, and have useful levels of thermal stability associated with high glass transition temperatures (307-343°C), 10% weight-loss temperatures in excess of 500°C, and char yields at 800°C in nitrogen higher than 65%. These polymers exhibit a maximum UV-vis absorption at 300 nm with a fluorescence emission maxima around 449-454 nm in N-methyl-2-pyrrolidinone solution. The hole-transporting and electrochromic properties are examined by electrochemical and spectroelectrochemical methods. Cyclic voltammograms of the poly(amine-amide-imide) films cast onto an indium tin oxide-coated glass substrate exhibit a reversible oxidation at 0.84 V and irreversible oxidation redox couples at 1.27 V versus Ag/AgCl in acetonitrile solution, and reveal good stability of electrochromic characteristics, with a color change from yellowish to green at applied potentials ranging from 0.00 to 0.95 V. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.
Type
journal article