Thermal and mechanical properties of polyethylene glycol (PEG)-modified lignin/polylactic acid (PLA) biocomposites

IF 7.7 1区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY International Journal of Biological Macromolecules Pub Date : 2024-02-08 DOI:10.1016/j.ijbiomac.2024.129997

Zehui Ju , Nicolas Brosse , Sandrine Hoppe , Zhiqiang Wang , Isabelle Ziegler-Devin , Haiyang Zhang , Biqing Shu

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Abstract

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.

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聚乙二醇（PEG）改性木质素/聚乳酸（PLA）生物复合材料的热性能和机械性能。

本研究提出了一种利用双螺杆挤出工艺制备聚乳酸（PLA）和聚乙二醇（PEG）改性木质素生物复合材料的方法。通过傅立叶变换红外光谱（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、差示扫描量热仪（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 改性木质素对聚乳酸复合材料的影响。实验结果表明，添加 PEG 改性木质素增强了聚乳酸复合材料的耐热性。聚乳酸最多可与 30% 的 PEG 改性木质素结合，但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%。该方法为生产高性能木质素基聚乳酸复合材料提供了一条新途径，具有一定的工业应用价值。

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来源期刊

International Journal of Biological Macromolecules 生物-生化与分子生物学

CiteScore

13.70

自引率

9.80%

发文量

2728

审稿时长

64 days

期刊介绍： The International Journal of Biological Macromolecules is a well-established international journal dedicated to research on the chemical and biological aspects of natural macromolecules. Focusing on proteins, macromolecular carbohydrates, glycoproteins, proteoglycans, lignins, biological poly-acids, and nucleic acids, the journal presents the latest findings in molecular structure, properties, biological activities, interactions, modifications, and functional properties. Papers must offer new and novel insights, encompassing related model systems, structural conformational studies, theoretical developments, and analytical techniques. Each paper is required to primarily focus on at least one named biological macromolecule, reflected in the title, abstract, and text.