Isotactic 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.

中文翻译：

---

在层间空间中通过模板聚合方便地合成等规聚丙烯腈用于介电储能

等规聚丙烯腈（iso -PAN）通过模板聚合反应以CoCl ₂晶体的二维分层空间为模板进行合成。聚丙烯腈的等规度达到了介孔/介孔三单元组= 93％（mm = 0.93），这表明聚合物链具有更好的堆积性，从而导致了高击穿强度。规整度的提高与模板层晶体的原子间（金属-金属）距离有关。由于腈基的偶极矩（4.3 D）大且立体规整度高，iso -PAN在660 MV / m的条件下显示出6.7 J / cm ³的高放电能量密度，几乎是无规聚丙烯腈（ata）的六倍-PAN）和双轴拉伸聚丙烯（BOPP），一种可商购的介电聚合物薄膜。此外，它的充放电效率约为。在广阔的应用电场范围内达到90％，高于ata -PAN和BOPP的效率。这些结果表明，具有大偶极矩和高立构规整度的iso -PAN是高能量密度和低损耗电容器电介质的有希望的候选者。