Synthesis and evaluation of photoluminescent and electrochemical properties of new aromatic polyamides and polyimides with a kink 1,2‐phenylenediamine moiety

Abstract

A series of novel triphenylamine‐containing aromatic polyamides and polyimides having a crank and twisted noncoplanar structures were synthesized in inherent viscosities of 0.14–0.64 dL/g and 0.11–0.67 dL/g, respectively. These polymers had useful levels of thermal stability associated with relatively high glass‐transition temperatures (174–311 °C). They exhibited strong UV–Vis absorption bands at around 300 nm in NMP solutions. The PL spectra of these polymers in NMP solutions (1 × 10−5 M) showed maximum peaks around 396–479 nm. The hole‐transporting and electrochromic properties were examined by electrochemical and spectroelectrochemical methods. Cyclic voltammetry (CV) of the polymer films cast onto an indium‐tin oxide (ITO)‐coated glass substrate exhibited two reversible oxidation redox couples at potentials of 0.70–1.01 V and 1.10–1.46 V, respectively, vs. Ag/AgCl in acetonitrile solution. The polymer films revealed electrochromic characteristics, with a color change from neutral pale yellowish to green and then to a blue oxidized form at applied potentials ranging from 0.00 to 1.75 V. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2587–2603, 2006

Solution, thermal, and optical properties of poly(pyridinium salt)s derived from an ambipolar diamine consisting of diphenylquinoline and triphenyl amine moieties

“…Development of novel light‐emitting materials has been of particular interest for applications in optoelectronics. To achieve this goal, many neutral light‐emitting polymers have been developed,3 but there are a few examples that have a D‐A chemical architecture 4b, 14. Here, we demonstrated how a D‐A arrangement based on ambipolar moiety affects the optical properties of poly(pyridinium salt)s. The fluorescence of polymer solutions in neutral condition was too low to measure.…”

Solution, thermal and optical properties of novel poly(pyridinium salt)s derived from conjugated pyridine diamines

“…In their reviewed articles, Shirota et al had identified a number of structural characteristics necessary to achieve a stable glassy state, while keeping high thermal stabilities 14. These structural designs have been applied successfully in both molecular14 and polymeric15 materials. The synthesized ionic polymers had high T g s as compiled in Table 3, similar to neutral polymers based on 4‐aryl‐2,6‐bis(4‐aminophenyl)‐pyridine 5–7.…”

Antegrade approach for percutaneous valve implantation

“…In their reviews, Shirota et al2 outlines a few of the necessary structural conditions that would ensure a stable glassy state of a material. Liou et al3 had successfully demonstrated application on these structural characteristics by preparing a conjugated monomer having a crank and twisted noncoplanar moiety. Various low molecular weight, oligomeric and polymeric materials were explored as potential candidates for OLEDs 4.…”