Colloidal lignin nanoparticles (LNPs) from low temperature acid hydrotropic fractionation (AHF) of poplar wood and commercial alkali lignin using p-Toluenesulfonic acid (p-TsOH) were directly mixed with PVA to make PVA/AHF-LNP nanocomposite films. p-TsOH itself acted as a plasticizer for PVA; however the application of p-TsOH alone reduced PVA film tensile strength and therefore toughness. At proper loadings of LNPs and p-TsOH, both the failure strain and tensile strength of PVA/AHF-LNP composites were improved. The formation of hydrogen bonding between the p-TsOH/AHF-LNP aggregates with hydroxyl groups on PVA molecular chains, and the breakage and reforming of p-TsOH/AHF-LNP aggregates, along with the nanophase crazing due to the presence of p-TsOH/AHF-LNP aggregates were identified as the main mechanisms for improving the toughness of PVA/AHF-LNP nanocomposite. The composite also had improved UV shielding performance and biodegradability due to the presence of p-TsOH and LNPs compared with neat PVA. This nanocomposite film could be used as biodegradable anti-ultraviolet packing film.

将杨木的低温酸性亲水性分馏（AHF）和使用对甲苯磺酸（p- TsOH）的商品碱木质素得到的胶体木质素纳米颗粒（LNP）与PVA直接混合，制成PVA / AHF-LNP纳米复合膜。对-TsOH本身可作为PVA的增塑剂；但是，单独使用p- TsOH会降低PVA膜的拉伸强度，从而降低韧性。在适当负载的LNP和p- TsOH下，PVA / AHF-LNP复合材料的破坏应变和拉伸强度均得到改善。的之间的氢键的形成对-与PVA分子链的羟基加入TsOH / AHF-LNP聚集体，和破损和重整P-TsOH / AHF-LNP聚集体以及由于存在p -TsOH / AHF-LNP聚集体而引起的纳米相裂纹被确定为提高PVA / AHF-LNP纳米复合材料韧性的主要机理。与纯PVA相比，由于存在p- TsOH和LNP，该复合材料还具有改善的紫外线屏蔽性能和可生物降解性。该纳米复合膜可用作可生物降解的抗紫外线包装膜。