High-Performance Functional Polyimides Containing Rigid Nonplanar Conjugated Triphenylethylene Moieties
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- 作者：Yiwu Liu ; Yi Zhang ; Qi Lan ; Siwei Liu ; Zexin Qin ; Lianghui Chen ; Cunyuan Zhao ; Zhenguo Chi ; Jiarui Xu ; James Economy
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：March 27, 2012
- 年：2012
- 卷：24
- 期：6
- 页码：1212-1222
- 全文大小：757K
- 年卷期：v.24,no.6(March 27, 2012)
- ISSN：1520-5002
文摘
A novel, simple but efficient diamine (TriPEDA) containing rigid nonplanar conjugated triphenylethylene moieties was designed and synthesized through Wittig鈥揌orner and Suzuki coupling reactions. Four kinds of high-performance functional polyimides were thus prepared by the dipolymerization of TriPEDA and four dianhydrides, respectively. Because of the introduction of the aromatic rigid nonplanar triphenylethylene structure, the polyimides exhibited special fluorescent and resistive switching (ON-OFF) characteristics, as the maximum fluorescence emission of the four polyimides was observed at 472鈥?05 nm in NMP solution and at 473鈥?41 nm in film state. Also these organo-soluble polyimides showed outstanding properties, such as low dielectric constant (even without fluorinated substituents), light color, high glass transition temperatures (359鈥?09 掳C), thermal stability, and excellent mechanical properties. The memory devices with the configuration of indium tin oxide/polyimides/aluminum (ITO/PI/Al) exhibited distinct volatile memory characteristics of static random access memory (SRAM), with an ON/OFF current ratio of 1 脳 105 to 1 脳 106. These functional polyimides showed attractive potential applications in the field of high-performance flexible polymer photoconducting devices or polymer memory devices.