Dipole‐Switchable Poly(para‐phenyleneethynylene)s: Ferroelectric Conjugated Polymers. Issue 52 (27th November 2018)

• Record Type: Journal Article
• Authors: Kushida, Soh; Smarsly, Emanuel; Bojanowski, N. Maximilian; Wacker, Irene; Schröder, Rasmus R.; Oki, Osamu; Yamamoto, Yohei; Melzer, Christian; Bunz, Uwe H. F.
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 52(2018)
• Page Start: 17019
• Page End: 17022
• Publication Date: 2018-11-27
• Subjects: molecular devices -- molecular rotors -- organic ferroelectrics -- polymers; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201808827
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Dipolar 2, 3‐difluorobenzene units are introduced into the backbone of a poly( para ‐phenyleneethynylene) (PPE) to generate a ferroelectric conjugated polymer. The structural features of the partially fluorinated PPE allow for the generation of a remanent polarization in the solid state; the difluorinated benzene rings behave as molecular rotors at high temperature, while at room temperature, stacking of such rings clamps down the ring orientation. The molecular dipoles can still be oriented by moderate external electrical fields at room temperature, and this PPE is then ferroelectric. The concept should be transferable to other poly(aryleneethynylene)s, and novel conjugated ferroelectric conjugated polymers will be accessible using this concept. Abstract : Polarized polymers : Dipolar 2, 3‐difluorobenzene units are introduced into the backbone of PPE. The difluorinated benzene rings behave as molecular rotors at high temperature, while at room temperature, stacking of such rings clamps the ring orientation to generate a remanent polarization. The molecular dipoles are oriented by moderate external electrical fields, and this PPE is then a ferroelectric conjugated polymer.