Dual stimuli-responsive viologen-containing poly(2-isopropyl-2-oxazoline) and its multi-modal electrochromic phase transition†,Polymer Chemistry

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Dual stimuli-responsive viologen-containing poly(2-isopropyl-2-oxazoline) and its multi-modal electrochromic phase transition†
Polymer Chemistry ( IF 4.1 ) Pub Date : 2018-06-11 00:00:00 , DOI: 10.1039/c8py00591e
Jaehyuk Nam _{1,

2,

3,

4} , Yongseok Jung _{1,

2,

3,

4} , Jungho Joe _{1,

2,

3,

4} , Woo-Dong Jang _{1,

2,

3,

4}

Affiliation

A viologen-containing thermo-responsive poly(2-isopropyl-2-oxazoline) (PiPOx-V) was synthesized by a simple one-pot reaction. During the cationic ring opening polymerization of 2-isopropyl-2-oxazoline, living cationic polymer chains were reacted with 4,4-bipyridyl to produce dual thermo- and redox-responsive PiPOx-V. An aqueous solution of PiPOx-V showed decreasing transmittance on increasing the temperature to 50 °C through the hydrophilic–hydrophobic phase transition. When sodium dithionite was added to the solution of PiPOx-V, the transparent solution was immediately changed to a blue colored solution, indicating the formation of a radical cation by single-electron reduction. The blue color gradually disappeared by aerobic oxidation. In addition to the color change, the thermal transition temperature of PiPOx-V also changed by redox state change of the viologen unit. Because PiPOx-V exhibited reversible redox behavior with color change, electrochromic behavior was investigated using a sandwich-type ITO glass cell containing an aqueous solution of PiPOx-V (180 mg mL⁻¹) with potassium ferricyanide (20 mM) as an electrolyte. When we applied a 1.5 V electric potential to the ITO glass cell, the solution changed to the violet phase. The violet phase was reversibly changed to the transparent state by the removal of the applied voltage. The PiPOx-V-containing ITO glass cell exhibited four different visual states due to variations in the temperature and electric potential. The thermal and electrochromic changes of PiPOx-V were fully reversible for 100 cycles of repeated voltage shifts.

中文翻译：

含双刺激反应的含紫精的聚（2-异丙基-2-恶唑啉）及其多峰电致变色相变†

通过简单的一锅反应合成了含紫精的热响应性聚（2-异丙基-2-恶唑啉）（PiPOx-V）。在2-异丙基-2-恶唑啉的阳离子开环聚合过程中，活性阳离子聚合物链与4,4-联吡啶基反应生成对热和氧化还原有响应的PiPOx-V。PiPOx-V水溶液通过亲水-疏水相变将温度升高至50°C时，透射率会降低。将连二亚硫酸钠添加到PiPOx-V的溶液中，透明溶液立即变为蓝色溶液，表明通过单电子还原形成了自由基阳离子。通过有氧氧化，蓝色逐渐消失。除了颜色变化外，PiPOx-V的热转变温度还因紫精单元的氧化还原状态变化而变化。由于PiPOx-V随颜色变化表现出可逆的氧化还原行为，因此使用包含PiPOx-V（180 mg mL ^-1）水溶液的夹心型ITO玻璃电池研究了电致变色行为。），并用铁氰化钾（20 mM）作电解质。当我们向ITO玻璃电池施加1.5 V电势时，溶液变成紫罗兰色相。通过去除施加的电压，紫罗兰相可逆地变为透明状态。所述PiPOx-V的含ITO玻璃电池呈现四种不同的视觉状态由于在温度和电势的变化。PiPOx-V的热和电致变色在100次重复的电压移位周期中是完全可逆的。

更新日期：2018-06-11

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