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Dipole Switchable Poly(para-phenyleneethynylene)s: Ferroelectric Conjugated Polymers
摘要： 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 a ferroelectric. The concept should be transferable to other poly(aryleneethynylene)s and novel conjugated ferroelectric conjugated polymers will be accessible using this concept.
关键词： Molecular Rotors,Molecular devices,Organic Ferroelectrics,Polymers
更新于2025-09-23 15:21:01
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Dipole Switchable Poly(para-phenyleneethynylene)s: Ferroelectric Conjugated Polymers
摘要： 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 a ferroelectric. The concept should be transferable to other poly(aryleneethynylene)s and novel conjugated ferroelectric conjugated polymers will be accessible using this concept.
关键词： Molecular Rotors,Molecular devices,Organic Ferroelectrics,Polymers
更新于2025-09-23 15:21:01
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Dielectric properties of self-assembled spherulite films of organic ferroelectric 2-methylbenzimidazole
摘要： Thin films of organic ferroelectric 2-methylbenzimidazole (MBI) were grown by evaporation method on different substrates. The films consist of self-assembled spherulite blocks formed by elongated crystallites of MBI. Temperature, frequency, and electric field amplitude variations of in-plane hysteresis dielectric loops were measured using interdigital system of electrodes and compared with analogous dependences in MBI single crystals. Simulation of remnant polarization Prem dependence on amplitude of electric field Emax in films is carried out in frames of a model considering the dipole moment of block as a sum of dipole moments of crystallites, which form spherulite with account of different orientation of crystallites relative to applied electric field. Deviations from the model are assosiated with complicated domain structure and presence of depolarizing fields.
关键词： Split crystals,organic ferroelectrics,polarization switching
更新于2025-09-12 10:27:22