Thermostable fluorinated aromatic polyethers as materials for modern microelectronics and light-responsive elements
According to the materials of report at the meeting of the Presidium of the NAS of Ukraine, May 3, 2023
DOI:
https://doi.org/10.15407/visn2023.07.072Keywords:
fluorinated poly(arylene ether)s, dielectric properties, 5G technology, light-responsive polymers, azobenzene, azomethine group, reversible photoisomerization, photoinduced birefringenceAbstract
We propose a strategy for the synthesis of fluorinated poly(arylene ether)s (FPAEs) of linear and cross-linked hybrid organic-inorganic macromolecular structures, which are characterized by high thermal stability. The synthesized polymers could afford flexible and strong films with a low dielectric constant (1.86—2.75 at 10 kHz) and dissipation factor (0.0013—0.0037 at 10 kHz). This allows their use as interlayer dielectrics in integrated circuits for modern micro- and nanoelectronics, in particular in the fabrication of printed circuit boards for 5G communication technology. The 5G mobile network is envisioned to be the communication standard to effectively support diverse operations and applications of unmanned aerial vehicles or autonomous demining robots. Next, we developed a synthetic route for new meta-linked FPAEs having both azobenzene and azomethine optically active groups. Because of their unique chemical structures, the obtained light-sensitive FPAEs exhibited good solubility in polar aprotic solvents and the ability to form mechanically stable free-standing films in which trans-cis photoisomerization of azo/azomethine groups occurred under UV irradiation. Polymers were capable of photoinduced birefringence by lasers of different wavelengths (in particular, 405 or 532 nm) and recording of polarization gratings. The azo-azomethine polymers are promising as thermostable optically active components in various sensors, photo-orienting surfaces, in the creation of tactile holograms, electro-optical converters/modules, in medicine, etc. The resulting systems can be used in soft robotics and for vehicles (unmanned aerial vehicles, robots for demining).
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