Abstract We demonstrated here for the first time the synthesis of fluorinated hyperbranched polyimide (FHPIs) and an evaluation of their properties. A series of novel fluorinated hyperbranched polyimides were respectively synthesized via a two–step chemical imidization method involving a polycondensation reaction between 1,3,5–tris(2–trifluoromethyl–4–aminophenoxy) benzene (TFAPOB) and four different dianhydride monomers bearing bulky substituents. The properties of the synthesized FHPIs (individually denoted as FHPI I–IV) were characterized by Fourier-transform infrared, nuclear magnetic resonance (NMR), Near-IR, and UV-vis spectroscopy, techniques as well as via, atomic force microscopy (AFM), tensile testing, dielectric constants, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA), In addition, the dielectric constants, chromaticity values, refractive indices, and birefringence values of these materials were determined. The obtained FHPIs showed good solubility and film–forming properties. The FHPIs exhibited excellent optical properties which included very light color, outstanding optical transparency (80–85% at 450 nm, 86–88% at 550 nm, 88–89% at 800 nm), birefringence values ranging from 0.0011 to 0.0020, adjustable refractive indices (1.4721–1.5644 at 650 nm), a cut–off wavelength within 353 nm, and a low absorption range in the near–infrared region. These materials would be ideal candidates for use in optical devices.

中文翻译：

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具有长线性主链和庞大取代基的新型光学透明氟化超支化聚酰亚胺家族

摘要 我们在这里首次展示了氟化超支化聚酰亚胺 (FHPI) 的合成及其性能评估。通过两步化学酰亚胺化方法分别合成了一系列新型氟化超支化聚酰亚胺，该方法涉及 1,3,5-三（2-三氟甲基-4-氨基苯氧基）苯（TFAPOB）与四种不同的二酐单体之间的缩聚反应。取代基。合成的 FHPI（分别表示为 FHPI I-IV）的特性通过傅里叶变换红外、核磁共振 (NMR)、近红外和紫外可见光谱、技术以及通过原子力显微镜进行表征。 AFM)、拉伸试验、介电常数、差示扫描量热法 (DSC) 和热重分析 (TGA)，此外，确定了这些材料的介电常数、色度值、折射率和双折射值。获得的 FHPIs 显示出良好的溶解性和成膜性能。FHPI 表现出优异的光学特性，包括非常浅的颜色、出色的光学透明度（450 nm 处为 80-85%，550 nm 处为 86-88%，800 nm 处为 88-89%），双折射值范围为 0.0011 至 0.0020，可调折射率（650 nm 处为 1.4721–1.5644），截止波长在 353 nm 以内，并且在近红外区域具有低吸收范围。这些材料将是用于光学器件的理想候选材料。FHPI 表现出优异的光学特性，包括非常浅的颜色、出色的光学透明度（450 nm 处为 80-85%，550 nm 处为 86-88%，800 nm 处为 88-89%），双折射值范围为 0.0011 至 0.0020，可调折射率（650 nm 处为 1.4721–1.5644），截止波长在 353 nm 以内，并且在近红外区域具有低吸收范围。这些材料将是用于光学器件的理想候选材料。FHPI 表现出优异的光学特性，包括非常浅的颜色、出色的光学透明度（450 nm 处为 80-85%，550 nm 处为 86-88%，800 nm 处为 88-89%），双折射值范围为 0.0011 至 0.0020，可调折射率（650 nm 处为 1.4721–1.5644），截止波长在 353 nm 以内，并且在近红外区域具有低吸收范围。这些材料将是用于光学器件的理想候选材料。