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Electrochromic Polymers (electrochromic + polymer)

Distribution by Scientific Domains
Polymers and Materials Science100%

Selected Abstracts

Spray-Processable Blue-to-Highly Transmissive Switching Polymer Electrochromes via the Donor,Acceptor Approach

ADVANCED MATERIALS, Issue 6 2010
Chad M. Amb
Spray processable blue electrochromic polymers with strictly alternating "donor-acceptor" copolymers are reported that exhibit saturated blue neutral states, highly transmissive oxidized states, excellent optical contrasts, fast switching times, and long-term redox switching stability. In addition, an alkylester-functionalized analogue is demonstrated, where the solubility of the material thin-film is irreversibly changed while allowing it to retain its electroactivity. [source]

Effect of conjugated core building block dibenzo[a,c]phenazine unit on ,-conjugated electrochromic polymers: Red-shifted absorption

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 8 2010
Elif Kose Unver
Abstract A comparative investigation was undertaken for the electrosynthesis and electrochemical properties of three different electroactive polymers having a conjugated core building block, dibenzo[a,c]phenazine. A series of monomers has been synthesized as regards to thiophene based units; thiophene, 3-hexyl thiophene, and 3,4-ethylenedioxythiophene. The effects of different donor substituents on the polymers' electrochemical properties were examined by cyclic voltammetry. Introducing highly electron-donating (ethylene dioxy) group to the monomer enables solubility while also lowering the oxidation potential. The planarity of the monomer unit enhances ,-stacking and consequently lowering the Eg from 2.4 eV (PHTP) to 1.7 (PTBP). Cyclic voltammetry and spectroelectrochemical measurements revealed that 2,7-bis(4-hexylthiophen-2-yl)dibenzo[a,c]phenazine (HTP) and 2,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)dibenzo[a,c]phenazine (TBP) possessed electrochromic behavior. The colorimetry analysis revealed that while PTBP have a color change from red to blue, PHTP has yellow color at neutral state and blue color at oxidized state. Hence the presence of the phenazine derivative as the acceptor unit causes a red shift in the polymers' absorption to have a blue color. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1714,1720, 2010 [source]

Smart sunglasses based on electrochromic polymers

POLYMER ENGINEERING & SCIENCE, Issue 11 2008
Chao Ma
Smart sunglasses based on electrochromic polymers are proposed and developed in this study. This article discusses the design, processing, and the optical and electrical performance of a prototype smart sunglasses based on cathodic electrochromic (EC) polymers, which show several merits compared with traditional materials for sunglasses lens as well as other smart window materials. It is a multilayer design of device. The conjugated polymer, poly[3,3-dimethyl-3,4-dihydro-2H-thieno [3,4-b] [1,4]dioxepine] (PProDOT-Me2), is utilized as the electrochromic working layer. The counter layer of the device is vanadium oxide (V2O5) film, which serves as an ion storage layer. There is also a polymer gel electrolyte acting as the ionic transport layer, sandwiched between the working and counter layers. The characteristics of the prototype device are reported, including transmittance (%T), driving power, response time, open circuit memory, and lifetime. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers [source]