College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, PR China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, PR China; Université de Lorraine - INRAE - LERMAB - GP4W, F 54000 Nancy, France.
Université de Lorraine - INRAE - LERMAB - GP4W, F 54000 Nancy, France.
Int J Biol Macromol. 2024 Mar;262(Pt 1):129997. doi: 10.1016/j.ijbiomac.2024.129997. Epub 2024 Feb 8.
In this study, a method was proposed to prepare biocomposites from polylactic acid (PLA) and polyethylene glycol (PEG)-modified lignin using twin-screw extrusion process. The structure of PEG-modified lignin was studied by Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatographic (GPC) analysis. The effects of different contents of soda lignin and PEG-modified lignin on PLA composites were studied by tensile test, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), dynamic mechanical analysis (DMA) and degradation analysis. The experimental results showed that the addition of PEG-modified lignin enhanced the heat resistance of PLA composite. PLA could be combined with up to 30 % PEG-modified lignin, with no significant reduction in tensile strength properties. Compared with PLA-L30, the tensile stress and elongation at break of PLA-PL30 were increased by 26.4 % and 78.9 %, respectively. This approach provided a new way to produce high-performance lignin based-PLA composites and had certain industrial application value.
在这项研究中，提出了一种使用双螺杆挤出工艺由聚乳酸（PLA）和聚乙二醇（PEG）改性木质素制备生物复合材料的方法。通过傅里叶变换红外光谱（FTIR）和凝胶渗透色谱（GPC）分析研究了 PEG 改性木质素的结构。通过拉伸试验、差示扫描量热法（DSC）、热重分析（TGA）、扫描电子显微镜（SEM）、动态力学分析（DMA）和降解分析研究了不同含量的苏打木质素和 PEG 改性木质素对 PLA 复合材料的影响。实验结果表明，添加 PEG 改性木质素提高了 PLA 复合材料的耐热性。PLA 可以与高达 30%的 PEG 改性木质素结合，其拉伸强度性能没有明显降低。与 PLA-L30 相比，PLA-PL30 的拉伸应力和断裂伸长率分别提高了 26.4%和 78.9%。该方法为制备高性能木质素基 PLA 复合材料提供了一种新途径，具有一定的工业应用价值。
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