Bleached softwood pulp was used to prepare nanofibrillated cellulose (NFC) by mechanical grinding and a high-pressure homogenization process. Acetylation improved the aspect ratio and dispersion of the NFC; however, highly acetylated NFC was not able to form a film by vacuum filtration if the NFC : acetic anhydride (AA) ratio was greater than 1 : 6. An NFC film prepared by acetylated NFC has potential as a flexible organic light-emitting device (FOLED) substrate. Acetylation improved the thermal stability and transmittance of NFC films, which were optimal at 5.43 ppm K⁻¹ and 65%, respectively, when the ratio of NFC : AA was 1 : 3. Moreover, both the mechanical properties and flexibility of the NFC films were well maintained when the NFC : AA ratio was 1 : 3. Additionally, all NFC films prepared by acetylated NFC were smooth, flat, and uniform.

中文翻译：

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乙酰化可提高基于纳米纤维素薄膜的 FOLED 基板的热稳定性和透射率†

漂白针叶木浆用于通过机械研磨和高压均质工艺制备纳米原纤化纤维素 (NFC)。乙酰化改善了 NFC 的纵横比和分散性；然而，如果 NFC 与乙酸酐 (AA) 的比例大于 1:6，则高度乙酰化的 NFC 无法通过真空过滤形成薄膜。由乙酰化 NFC 制备的 NFC 薄膜具有作为柔性有机发光器件的潜力。 FOLED) 基板。乙酰化提高了 NFC 薄膜的热稳定性和透光率，在 5.43 ppm K ^-1时最佳当 NFC : AA 的比例为 1: 3 时, 分别为 65% 和 65%。此外, 当 NFC: AA 的比例为 1: 3 时, NFC 薄膜的机械性能和柔韧性都得到了很好的保持。 此外, 所有制备的 NFC 薄膜通过乙酰化 NFC 得到的样品光滑、平整、均匀。