Lignin-containing cellulose nanopaper (LCNP) has emerged as a new generation of sustainable film for packaging and electronics. While compared with pure cellulose nanopaper (CNP), it still exhibits relatively lower transparency or declining mechanical performance, which greatly hinders its practical application. To address these issues, we reported a highly available route involving a TEMPO-mediated oxidation method followed by a homogenization process to prepare lignin-containing cellulose nanofibers (LCNFs) based on a lignocellulose material and then directly processed the LCNFs into a dense film (LCNP) via a mature papermaking process. Due to small fibers produced by this method, the resultant LCNP exhibits an ultrahigh visible light transmittance (∼91%) close to CNP. Moreover, the high lignin reservation (∼16%) endows the nanopaper excellent UVA-blocking efficiency (∼68%) and better environmental durability than CNP. The retaining lignin was found to serve as a reinforcing agent filled in LCNP, resulting in a significant improvement on toughness, wet mechanical property, and thermal stability. Overall, this fully biobased LCNP with outstanding performance is a promising candidate to replace conventional petroleum-based materials in the fields like flexible electronics, packaging, and protective products.

中文翻译：

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具有木质纤维素的高度透明纳米纸，具有可调节的紫外线阻隔性能和卓越的耐久性

含木质素的纤维素纳米纸（LCNP）已成为新一代用于包装和电子产品的可持续薄膜。与纯纤维素纳米纸（CNP）相比，它仍然表现出相对较低的透明度或机械性能下降，这极大地阻碍了其实际应用。为了解决这些问题，我们报告了一条涉及TEMPO介导的氧化方法的高可用性途径，然后采用均质化工艺来制备基于木质纤维素材料的含木质素的纤维素纳米纤维（LCNF），然后将其直接加工成致密膜（LCNP）。 ）通过成熟的造纸过程。由于通过这种方法生产的细纤维，所得的LCNP表现出接近CNP的超高可见光透射率（〜91％）。此外，木质素保留率高（约16％）赋予纳米纸优异的UVA阻断效率（约68％）和比CNP更好的环境耐久性。发现保留的木质素充当填充在LCNP中的增强剂，从而导致韧性，湿机械性能和热稳定性的显着改善。总体而言，这种具有优异性能的全生物基LCNP是在柔性电子，包装和保护产品等领域取代常规石油基材料的有希望的候选者。