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- W2149759692 abstract "In this study, a new synthetic route was developed to prepare polyimide–nanocrystalline-titania hybrid materials with a relatively high titania content (up to 90 wt%). A soluble polyimide with carboxylic acid end groups (6FDA–6FpDA–COOH) was first synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 4,4′-(hexafluoroisopropylidene) dianiline (6FpDA), and 4-aminobenzoic acid (4ABA). Such end groups could undergo an esterification reaction with titanium butoxide and provide organic–inorganic bonding. A homogeneous hybrid solution was obtained through the mole ratio of titanium butoxide/carboxylic acid, water/acid content, and a mixed solvent system. HRTEM and XRD results indicated the formation of nanocrystalline-titania domains of around 3–4 nm in the hybrid films. The spin-coated hybrid films had relatively good surface planarity, high thermal stability, tunable refractive index (1.571 < n < 1.993), and optical transparency in the visible range. The achieved refractive index of 1.943 is the highest among the polymer–titania based hybrid materials as far as we know. A three-layer anti-reflection coating based on the prepared hybrid films was designed and possessed a reflectance of less than 0.5% in the visible range. Our study demonstrates a new route for preparing high refractive index polyimide–nanocrystalline-titania hybrid materials for potential optical applications." @default.
- W2149759692 created "2016-06-24" @default.
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- W2149759692 date "2008-01-01" @default.
- W2149759692 modified "2023-10-17" @default.
- W2149759692 title "High refractive index polyimide–nanocrystalline-titania hybrid optical materials" @default.
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- W2149759692 doi "https://doi.org/10.1039/b717069f" @default.
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