Electrochromic properties of novel strictly alternating poly(amine–amide–imide)s with electroactive triphenylamine moieties

J. Polym. Sci. A Polym. Chem.

Zhang

Lan

et al. 2012

A simple diamine (TetraPEDA) containing rigid nonplanar conjugated tetraphenylethylene (TetraPE) moieties was designed and synthesized through Wittig–Horner and Suzuki coupling reactions. Four kinds of high‐performance functional polyimides (PI) were thus prepared by the polymerization of TetraPEDA and four dianhydrides, respectively. Because of the introduction of the aromatic rigid nonplanar TetraPE structure, the PI exhibited special fluorescent characteristics, as the maximum fluorescence emission of the four PI was observed at 425–505 nm in NMP solution and at 470–491 nm in film state. Also these organo‐soluble PI showed outstanding properties, such as low dielectric constant (even without fluorinated substituent), light color, high glass transition temperatures (382–443 °C) and thermal stability in air (Td5% up to 565 °C), and excellent mechanical properties. The polymer memory devices with the configuration of indium tin oxide/PI/aluminum (ITO/PI/Al) exhibited distinct volatile memory characteristics of static random access memory, with an ON/OFF current ratio of 1 × 104 to 1 × 105. These functional PI showed attractive potential applications in the field of high performance flexible polymer photoconducting devices or fluorescent polymer memory devices. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

Section: Resultsmentioning

confidence: 95%

Synthesis and properties of high‐performance functional polyimides containing rigid nonplanar conjugated tetraphenylethylene moieties

J. Polym. Sci. A Polym. Chem.

Zhang

Lan

et al. 2012

“…To obtain a more quantitative understanding of the nature of the sorption kinetics for the hydrogels, the initial swelling data were fitted to the following exponential heuristic equation for M t /M ∞ ≤ 0.6: 35,36 M t ∕M ∞ = kt n (11) where M t is the amount of water sorption at a given time, M ∞ is the equilibrium sorption at an infinitely long time, k is a characteristic constant of the gel and n is a characteristic exponent of the mode of transport of the penetrate. Values of n and k were calculated from the slopes and intercepts respectively of the plot of log M t /M ∞ against log t. In general, the hydrophobic monomer incorporated into the NIPAAm gel decreases the swelling ratio of the copolymeric gels, a phenomenon observed in Fig.…”

Section: Effect Of Meobipa Content On the Swelling Behaviors Of The Cmentioning

confidence: 99%

“…5. The values of n and D calculated from Eqns (10) and (11) are listed in Table 2. The results in Fig.…”

Section: Effect Of Meobipa Content On the Swelling Behaviors Of The Cmentioning

confidence: 99%

Influence ofMEOBiPAcontent on the properties of novel photoluminescent thermosensitive hydrogels

Lee

2015

Polymer International

In order to establish a dual functional hydrogel, a special monomer, methacryloyloxy-ethylene-oxy-carbonyl bis[4-(phenylisopropyl)phenyl]amine (MEOBiPA), was prepared from bis[4-(phenyl-isopropyl)phenyl]-4-cyanophenyl amine and 2-hydroxyethyl methacrylate. Subsequently, a series of thermosensitive hydrogels was obtained through copolymerization of N-isopropyl acrylamide (NIPAAm) with MEOBiPA by UV irradiation (named the NM series). The effect of MEOBiPA content on the swelling behavior, mechanical properties and drug release behavior of the hydrogels was further investigated. Results showed that the swelling ratios of the NM copolymeric hydrogels decreased from 4.73 to 1.74 g g −1 when the MEOBiPA content in the hydrogel increased from 0.1 to 0.9 mol%. Both gel strength and crosslinking density of the NM hydrogels increased with increasing MEOBiPA. Conversely, the thermosensitive behavior of NM hydrogels significantly decreased upon increase of MEOBiPA content. Likewise, the caffeine release ratio also decreased from 70% to 25%. Notably, the intensity of photoluminescence increased with increasing MEOBiPA content in the hydrogels. Further, the corresponding copolymers of the hydrogels were prepared using free radical polymerization. The UV absorbance and photoluminescent behavior of the MEOBiPA, NIPAAm/MEOBiPA copolymeric hydrogels and their corresponding copolymers in different polar solvents were also investigated.

“…Many intensive studies on the design and synthesis of TPA‐based polymers as EC materials have been carried out because TPA is easily oxidized to form radical cation with a remarkable change of color in the EC reaction. Liou and coworkers investigated deeply on a series of triarylamine‐based polymers for EC applications . The TPA‐based polymers have showed good electrochemical stability, highlight e lectron‐donating efficienc y, photoconductivity, and photorefractivity.…”

Section: Introductionmentioning

confidence: 99%

Two New Bithiophenes Derivatives Multielectrochromic Copolymer Based on Triphenylamine Unit and Their Application for Electrochromic Devices

Zhang

Kong

Bulletin Korean Chem Soc

et al. 2016

Two monomers including 4,4′,4″‐tris(3‐methoxythiophene‐2‐yl)triphenylamine (M1) and 4,4′,4″‐tris(3,4‐dimethoxythiophene‐2‐yl)triphenylamine (M2) with triphenylamine as their core were synthesized and the corresponding polymers were obtained by electrochemical polymerization. Their electrochemical properties were investigated using scanning electron microscopy, UV–Vis, and cyclic voltammetry. It was found that the two polymers had reversible redox behavior with the different color change under the applied potentials. Both the polymers displayed high switching efficiency and optical contrast. Moreover, the corresponding electrochromic devices (ECDs) employing the synthesized polymers and poly(3,4‐ethylenedioxythiophene) were constructed. The spectroelectrochemical experiments illustrated that the ECDs exhibited fast response time, reasonable optical contrast, favorable optical memories, and redox stability.