Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, Shandong, China.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China.
Biomacromolecules. 2022 Mar 14;23(3):829-838. doi: 10.1021/acs.biomac.1c01288. Epub 2022 Feb 22.
Thehighly efficient utilization of lignin is of great importance for the development of the biorefinery industry. Herein, a novel "core-shell" lignin nanoparticle (LNP) with a diameter of around 135 nm was prepared, after the lignin was isolated from the effluent of formic acid fractionation via dialysis. In an attempt to endow composite materials with vital functionalities, the LNP was added to the starch film and the starch/polyvinyl alcohol (PVA) or starch/polyethylene oxide (PEO) composite film. The results showed that the hydrophobicity performance of the synthesized films was enhanced significantly. Specifically, the dynamic water contact angle value of the starch/PVA composite film with 1% (wt) addition of LNPs could be maintained as high as 122° for 180 s; the starch/PEO composite film also achieved an excellent water contact angle above 120°. The addition of LNPs promoted the formation of some rough structures on the film surface, as shown by the scanning electron microscopy images, which could repel the water molecules efficiently and are closely related to the enhanced hydrophobicity of the starch film. What is more, the as-prepared LNP conferred strengthened thermal stability and ultraviolet blocking properties on the starch composite film. The structural combination of the polymer film with LNPs holds the promise for providing advanced functionalities to the composite material with wide applications.
木质素的高效利用对生物炼制工业的发展具有重要意义。在此，通过透析从甲酸分级分离的废水中分离木质素，制备了一种新型的直径约为 135nm 的“核-壳”木质素纳米颗粒（LNP）。为了赋予复合材料重要的功能，将 LNP 添加到淀粉膜以及淀粉/聚乙烯醇（PVA）或淀粉/聚氧化乙烯（PEO）复合膜中。结果表明，所合成膜的疏水性性能得到了显著提高。具体而言，添加 1%（wt）LNP 的淀粉/PVA 复合膜的动态水接触角值在 180s 内可保持高达 122°；淀粉/PEO 复合膜也实现了超过 120°的优异水接触角。LNP 的添加促进了薄膜表面形成一些粗糙结构，如扫描电子显微镜图像所示，这可以有效地排斥水分子，与淀粉膜增强的疏水性密切相关。此外，所制备的 LNP 赋予淀粉复合膜增强的热稳定性和紫外线阻隔性能。聚合物膜与 LNP 的结构组合有望为具有广泛应用的复合材料提供先进的功能。
