This work reports on a green and simple procedure to manufacture spherical lignin particles (SLPs) in sub-micron scale. Softwood kraft lignin was fractionated using a ubiquitous organic solvent, acetone, which is recoverable and reused in a following step to produce SLPs via self-assembly method. A portion phenolic content was increased in acetone-soluble lignin. The SLPs with an average diameter of 736 ± 39 nm were produced and used as natural-multifunctional additive for polyvinyl alcohol (PVA) films. Moreover, we presented a developed composite film of polyvinyl alcohol (PVA/SLPs) with an excellent UV-shielding ability and retaining its transparency. Enhancement in thermal and mechanical properties and UV-shielding ability of the obtained PVA/SLPs composite films was demonstrated. With only 0.2 wt% incorporation of SLPs, the composite film (PVA/0.2SLPs) exhibited melting temperature at 177 ± 2.6 °C, approximately 15 °C higher than that of the neat PVA film. Crystallinity of PVA/0.2SPLs composite film increased by 80% compared with the neat film. Modulus of the composite films was increased significantly from 1.7 ± 0.1 to 2.0 ± 0.2 GPa with 0.2 wt% loading of lignin particles. UV transmittance in both UVA and UVB regions through PVA/0.2SPLs composite films was significantly decreased while a satisfactory visible light transmittance was retained. This work provides a simple and green process for producing SLPs, which can be used in PVA films as UV-shielding agent and enhancer of thermal and mechanical properties.

这项工作报告了一种以绿色和简单的方式制造亚微米级球形木质素颗粒 (SLP) 的程序。软木硫酸盐木质素使用普遍存在的有机溶剂丙酮进行分馏，丙酮可回收并在后续步骤中重复使用，以通过自组装方法生产 SLP。丙酮可溶木质素中的部分酚类含量增加。生产了平均直径为 736±39 nm 的 SLP，并将其用作聚乙烯醇 (PVA) 薄膜的天然多功能添加剂。此外，我们提出了一种开发的聚乙烯醇复合薄膜（PVA/SLPs），具有出色的紫外线屏蔽能力并保持其透明度。证明了所获得的 PVA/SLPs 复合薄膜的热性能和机械性能以及紫外线屏蔽能力的增强。仅掺入 0.2 wt% 的 SLP，复合薄膜 (PVA/0.2SLPs) 的熔化温度为 177 ± 2.6 °C，比纯 PVA 薄膜的熔化温度高约 15 °C。PVA/0.2SPLs复合薄膜的结晶度比纯薄膜提高了80%。复合膜的模量从 1.7 ± 0.1 GPa 显着增加到 2.0 ± 0.2 GPa，木质素颗粒负载量为 0.2 wt%。通过 PVA/0.2SPLs 复合薄膜的 UVA 和 UVB 区域的紫外线透射率显着降低，同时保留了令人满意的可见光透射率。这项工作为生产 SLP 提供了一种简单、绿色的工艺，可在 PVA 薄膜中用作紫外线屏蔽剂和热性能和机械性能的增强剂。2SPLs复合膜比纯膜提高了80%。复合膜的模量从 1.7 ± 0.1 GPa 显着增加到 2.0 ± 0.2 GPa，木质素颗粒负载量为 0.2 wt%。通过 PVA/0.2SPLs 复合薄膜的 UVA 和 UVB 区域的紫外线透射率显着降低，同时保留了令人满意的可见光透射率。这项工作为生产 SLP 提供了一种简单、绿色的工艺，可在 PVA 薄膜中用作紫外线屏蔽剂和热性能和机械性能的增强剂。2SPLs复合膜比纯膜提高了80%。复合膜的模量从 1.7 ± 0.1 GPa 显着增加到 2.0 ± 0.2 GPa，木质素颗粒负载量为 0.2 wt%。通过 PVA/0.2SPLs 复合薄膜的 UVA 和 UVB 区域的紫外线透射率显着降低，同时保留了令人满意的可见光透射率。这项工作为生产 SLP 提供了一种简单、绿色的工艺，可在 PVA 薄膜中用作紫外线屏蔽剂和热性能和机械性能的增强剂。2SPLs 复合膜显着降低，同时保持令人满意的可见光透射率。这项工作为生产 SLP 提供了一种简单、绿色的工艺，可在 PVA 薄膜中用作紫外线屏蔽剂和热性能和机械性能的增强剂。2SPLs 复合膜显着降低，同时保持令人满意的可见光透射率。这项工作为生产 SLP 提供了一种简单、绿色的工艺，可在 PVA 薄膜中用作紫外线屏蔽剂和热性能和机械性能的增强剂。