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Polyetherimide (PEI)/hydroxyl‐functionalized barium titanate (BaTiO3) nanocomposite films were successfully prepared through solution‐casting followed by subsequent thermal imidization. The results of Fourier transform infrared spectroscopy confirmed that the chemical treatment with hydrogen peroxide (H2O2) could efficiently derive hydroxyl groups on the surface of BaTiO3 nanoparticles. The strong...
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