文献类型：期刊文献

英文题名：A Green Deep Eutectic Solvent Treatment to Enhance Uv Barrier Capacity, Thermal Stability, and Mechanical Properties in Wood Particle Filled Poly (Lactic Acid) Biocomposites for Packaging Application

作者：Lv, Chao[1] Luo, Shupin[1] Gao, Li[1] Guo, Wenjing[1]

第一作者：Lv, Chao

机构：[1] Research Institute of Wood Industry, Chinese Academy of Forestry, No. 2 Dongxiaofu, Haidian District, Beijing, 100091, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240083600)

语种：英文

外文关键词：Chlorine compounds - Composite materials - Eutectics - Impact strength - Lactic acid - Lignin - Packaging materials - Solvents - Wood

摘要：In this study, poplar wood particles (WP), were used as a bio-filler to compound with poly (lactic acid) (PLA) to prepare biocomposites. To enhance the interaction between WP and PLA, a novel deep eutectic solvent (DES) treatment strategy was applied to migrate lignin from interior to the surface of WP. WP was heated in DES that composed of lactic acid and choline chloride under different temperatures (110 °C and 130 °C) to achieve varying degrees of interior lignin extraction. The regenerated lignin increased the hydrophobicity of WP and decreased the interfacial energy, and served as a bio-compatibilizer enhancing interfacial compatibility. WP treated by DES at 110 °C (DWP110) shows higher surface coverage of lignin than that of WP treated at 130 °C (DWP130). Compared with WP/PLA composite, the notched impact strength, elongation at break, and flexural strength of DWP110/PLA composites increased by 49.3%, 24.3%, and 32.1%, respectively. Dynamic mechanical analysis revealed that loss modulus peak shifted from 61 °C to 72 °C and loss factor peak value decreased by 39.3%, indicating the interfacial adhesion was enhanced. As a benefit of lignin regeneration and deposition on DWP surface, the resultant DWP/PLA composites presented significantly higher UV barrier capacity, blocking nearly all UV-B (280~315 nm) and UV-A (315~400 nm) lights. Additionally, the thermal stability was improved with the onset degradation temperature and temperature at maximum weight loss rate increased by 30 and 15 °C. This work brought up an efficient and eco-friendly DES treatment strategy to achieve lignin migration, resulting in simultaneous improvements of mechanical properties, UV barrier capacity, and thermal stability for the resultant wood filled PLA biocomposites, which could facilitate potential applications as packaging materials. ? 2024, The Authors. All rights reserved.