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Facile Synthesis of Isotactic Polyacrylonitrile via Template Polymerization in Interlayer Space for Dielectric Energy Storage
journal contribution
posted on 2020-01-23, 17:06 authored by Yu Wang, Ryota Nakamura, Takeo Suga, Shengtao Li, Yoshimichi Ohki, Hiroyuki Nishide, Kenichi OyaizuIsotactic polyacrylonitrile
(iso-PAN) is synthesized
via template polymerization using the two-dimensional layered space
of a CoCl2 crystal as a template. Isotacticity of polyacrylonitrile
reaches a meso/meso triad = 93% (mm = 0.93), which
indicates a superior packing of polymer chains, leading to a high
breakdown strength. Tacticity enhancement is correlated with the interatomic
(metal–metal) distance of template-layered crystals. Due to
a large dipole moment (4.3 D) of nitrile group and a high stereoregularity, iso-PAN demonstrates a high discharge energy density of
6.7 J/cm3 at 660 MV/m, nearly six times that of atactic
polyacrylonitrile (ata-PAN) and biaxially oriented
polypropylene (BOPP), a commercially available dielectric polymer
film. Moreover, it exhibits a charge–discharge efficiency of
ca. 90% in a wide applied electric field range, which is higher than
the efficiencies of ata-PAN and BOPP. These results
suggest that iso-PAN, exhibiting a large dipole moment
and high stereoregularity, is a promising candidate for high energy
density and low loss capacitor dielectrics.
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dielectric polymer filmatactic polyacrylonitrileDielectric Energy Storage Isotactic polyacrylonitrilefield rangeInterlayer Spacedischarge energy densityBOPPTacticity enhancementFacile SynthesisefficiencyMVisotemplate polymerizationtemplate-layered crystalsenergy densityIsotactic Polyacrylonitrileloss capacitor dielectricsmomentstereoregularitynitrile groupbreakdown strengthCoCl 2 crystalTemplate Polymerizationpolymer chains
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