Kushida Soh, Smarsly Emanuel, Bojanowski N Maximilian, Wacker Irene, Schröder Rasmus R, Oki Osamu, Yamamoto Yohei, Melzer Christian, Bunz Uwe H F
Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld (INF) 270, 69120, Heidelberg, Germany.
CAM, Ruprecht-Karls-Universität Heidelberg, INF 225, 69120, Heidelberg, Germany.
Angew Chem Int Ed Engl. 2018 Dec 21;57(52):17019-17022. doi: 10.1002/anie.201808827. Epub 2018 Nov 27.
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.
将偶极2,3-二氟苯单元引入聚对苯撑乙炔（PPE）主链中，以生成一种铁电共轭聚合物。部分氟化PPE的结构特征使得在固态中能够产生剩余极化；二氟苯环在高温下表现为分子转子，而在室温下，这些环的堆积会限制环的取向。分子偶极在室温下仍可通过适度的外部电场进行取向，因此这种PPE具有铁电性。该概念应可转移至其他聚亚芳基乙炔，利用这一概念将可获得新型共轭铁电聚合物。
