Synthesis and characterization of a novel electrochromic aromatic polyamide from AB-type triphenylamine-based monomer
Journal
Journal of Polymer Science, Part A: Polymer Chemistry
Journal Volume
47
Journal Issue
8
Pages
1988-2001
Date Issued
2009
Author(s)
Lin, K.-H.
Abstract
A new triphenylamine-based polyamide I was prepared by direct polycon-densation of AB-type monomer, 4-amino-40-carboxy-400- methoxytriphenylamine (4), in the presence of triphenyl phosphite and pyridine as condensation agents. The obtained polyamide I showed excellent solubility in aprotic polar solvents such as NMP, DMAc, DMF, and DMSO and could be cast into transparent film with weight-average molecular weight (Mw = 63,400) and polydispersity index (PDI = 1.79). The polyamide I exhibited good thermal stability with relatively high glass-transition temperature (282 °C), 10% weight-loss temperature above 470 °C under a nitrogen atmosphere, and char yield at 800 °C in nitrogen higher than 64%. It also showed maximum ultraviolet-visible absorption at 362 nm and exhibited fluorescence emission maxima at 493 nm in NMP solution with fluorescence quantum yield 4.4%. Cyclic voltammogram of polyamide I film cast onto an indium tin oxide coated glass substrate exhibited one oxidative redox couple at 0.72 V (oxidation onset potential) versus Ag/AgCl in acetonitrile solution and revealed good stability of the electrochromic characteristic with a color change from colorless to green at applied potentials ranging from 0.00 to 1.10 V. © 2009 Wiley Periodicals, Inc.
Type
journal article