Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China.
Int J Biol Macromol. 2024 Jan;255:128099. doi: 10.1016/j.ijbiomac.2023.128099. Epub 2023 Nov 17.
Sustainably-sourced functional nanocellulose materials are vitally important for the green and sustainable development. Herein, we reported photocrosslinkable and hydroplasticable TEMPO-oxidized cellulose nanofiber phenyl propylene ketone ethers (TOCNPPK) films with excellent ultraviolet (UV) shielding, highly reversible processability, and extended mechanical properties, which were facilitated by green hydroxyl-yne click reaction. The introduction of conjugated aromatic ring and vinyl bonds (-C=C-) had been demonstrated the key for the improved overall performance of resultant TOCNPPK, which not only endowed the TOCNPPK with nearly 100 % UV shielding, but also enabled it to be formed into diverse 3D shapes (helix, ring and letters "N, F, U") via the facile hydrosetting method. The photocrosslinkable-enhanced mechanical performance of TOCNPPK films was also attributed to -C=C- which could crosslink via [2π + 2π] cycloaddition reactions under UV-irradiation. The ultimate stress of TOCNPPK films was as high as 210.0 ± 22.8 MPa and the Young's modulus was 11.5 ± 0.7 GPa, much superior to those of 128.6 ± 8.5 MPa and 9.2 ± 0.6 GPa for pristine TOCN films. Furthermore, the TOCNPPK had been demonstrated as efficient nanofillers for both hydrophilic polyvinyl alcohol and lipophilic polycaprolactone to develop advanced biodegradable composite films with the integration of good water-wetting resistance, excellent UV blocking, and photo-enhanced mechanical performance.
可持续来源的功能性纳米纤维素材料对于绿色和可持续发展至关重要。在此，我们报道了可光交联和可水塑的 TEMPO 氧化纤维素纳米纤维苯丙基酮醚（TOCNPPK）薄膜，具有优异的紫外线（UV）屏蔽、高度可逆的加工性和扩展的机械性能，这得益于绿色的羟基-炔点击反应。共轭芳环和乙烯基键（-C=C-）的引入被证明是提高所得 TOCNPPK 整体性能的关键，这不仅使 TOCNPPK 具有近 100%的 UV 屏蔽，而且还使它能够通过简便的水合定型方法形成各种 3D 形状（螺旋、环和字母“N、F、U”）。TOCNPPK 薄膜的光交联增强机械性能也归因于 -C=C-，它可以在 UV 照射下通过[2π+2π]环加成反应交联。TOCNPPK 薄膜的最终应力高达 210.0±22.8 MPa，杨氏模量为 11.5±0.7 GPa，远高于未交联的 TOCN 薄膜的 128.6±8.5 MPa 和 9.2±0.6 GPa。此外，TOCNPPK 已被证明是亲水性聚乙烯醇和疏水性聚己内酯的有效纳米填料，用于开发具有良好的耐湿性、优异的 UV 阻挡和光增强机械性能的先进可生物降解复合薄膜。
