A novel transparency foldable optical window film based on polybenzoxazole-amide-imide with high mechanical properties by improving charge transfer complex using hydrogen bonding.
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This study proposes a novel film that simultaneously enhances transparent optical and mechanical properties by altering the structural CTC interactions between molecules. To reinforce the structural properties of the polymeric film, structural analysis was conducted using Density functional theory (DFT) calculation. Simulation results revealed a new polybenzoxazole-amide-imide (BAI) film created by introducing the planar monomer 6-Amino-2-(4-aminophenyl)benzoxazole (6ABO), which increases rigidity by enhancing molecular packing. The new transparent optical film demonstrated a yellow index of 2.4, a total transmittance of 88%, a young’s modulus of 6.2GPa, and folding reliability exceeding 200,000 cycles with a radius of curvature of 1.5R. Compared to PET and PC, commonly used in general-purpose plastic optical films, this novel film exhibits significantly superior properties and is anticipated to be a candidate for next-generation display light window films.