title: Electrochromism and Nonvolatile Memory Device Derived from Triphenylamine-Based Polyimides with Pendant Viologen Units.
abstract: Three novel solution-processable polyimides containing triphenylamine and pendant viologen moieties are prepared from the newly synthesized diamine and three commercially available dianhydrides. The thermally stable polyimide with strong donor-acceptor charge-transfer possesses write-once read-many-times memory behavior with excellent operation stability. The obtained multicolored electrochromic polymer films reveal ambipolar electrochemical behavior with high optical transmittance contrast of coloration changed from transmissive neutral state to the cyan/magenta/yellow redox states, implying great potential for application in smart window and displays.
authors.affiliation: Functional Polymeric Materials Laboratory, Institute of Polymer Science and Engineering, National Taiwan University, 1 Roosevelt Road, 4th Sec., Taipei, 10617, Taiwan.
authors.forename: Hung-Ju
authors.initials: HJ
authors.lastname: Yen
authors.affiliation: Functional Polymeric Materials Laboratory, Institute of Polymer Science and Engineering, National Taiwan University, 1 Roosevelt Road, 4th Sec., Taipei, 10617, Taiwan.
authors.forename: Chia-Liang
authors.initials: CL
authors.lastname: Tsai
authors.affiliation: Functional Polymeric Materials Laboratory, Institute of Polymer Science and Engineering, National Taiwan University, 1 Roosevelt Road, 4th Sec., Taipei, 10617, Taiwan.
authors.forename: Shih-Han
authors.initials: SH
authors.lastname: Chen
authors.affiliation: Functional Polymeric Materials Laboratory, Institute of Polymer Science and Engineering, National Taiwan University, 1 Roosevelt Road, 4th Sec., Taipei, 10617, Taiwan.
authors.forename: Guey-Sheng
authors.initials: GS
authors.lastname: Liou
mesh_terms: D000588:Amines / Q000737:chemistry*; D039301:Computers, Molecular / Q000592:standards*; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*; D014755:Viologens / Q000737:chemistry*
chemical_list: D000588:Amines; D011108:Polymers; D014755:Viologens
keywords: electrochromism; memory device; polyimide; triphenylamine; viologen