先进应用领域的木质素-聚乳酸生物聚合物混合物--抗冲改性剂的影响

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES Composites Part C Open Access Pub Date : 2024-07-01 DOI:10.1016/j.jcomc.2024.100502
Matilda Johansson , Mikael Skrifvars , Nawar Kadi , Hom Nath Dhakal
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引用次数: 0

摘要

在这项研究中,通过羟基乙酰化对木质素进行化学改性,以增强其与聚乳酸(PLA)的界面连接。通过添加抗冲改性剂 Biomax Strong,进一步增强了混合效果。在聚乳酸-木质素混合物中加入 Biomax Strong 可改善材料特性,尤其是冲击强度和热稳定性。这种混合物具有独特的机械性能,其特点是拉伸模量降低,延展性增加。这将使聚乳酸在各种应用中得到更广泛的使用。所观察到的冲击强度的提高凸显了聚乳酸基体内应力再分布的协同效应,有助于聚乳酸基复合材料的广泛应用。在含有聚乳酸和 15 wt.% 木质素的复合材料中可以清楚地观察到这一点,其冲击强度约为 15 kJ/m2。添加 5 重量百分比的抗冲改性剂后,冲击强度提高了 60%,达到约 25 kJ/m2。这种协同效应加强了整体结构,提高了冲击韧性。Biomax Strong 与木质素的结合不仅解决了聚乳酸的局限性,还为需要平衡冲击强度、延展性和热稳定性的应用带来了新的机遇。这些进步预示着复合材料在各种应用领域的美好前景。
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Lignin-polylactic acid biopolymer blends for advanced applications – Effect of impact modifier

In this study, lignin underwent chemical modification via acetylation of hydroxyl groups to enhance its interfacial connection with poly (lactic acid) (PLA). Further enhancement of the blend was attained by adding an impact modifier, Biomax Strong. Incorporating Biomax Strong into PLA-lignin blends resulted in improvements in material characteristics, particularly in impact strength and thermal stability. This blend exhibited a unique set of mechanical properties, characterized by a reduction in tensile modulus as well as an increase in ductility. This will allow a more versatile use of PLA in various applications. The observed improved impact strength highlights the synergistic effect of stress redistribution within the PLA matrix contributing to widespread applications of PLA based composites. This can clearly be observed for the compound containing PLA and 15 wt.% lignin, where the impact strength was approximately 15 kJ/m2. With the addition of 5 wt.% impact modifier, the impact strength increased by 60 %, reaching approximately 25 kJ/m2. This synergy effect reinforces the overall structure, improving the impact toughness behavior. The combination of Biomax Strong and lignin not only address the limitations of PLA but also introduces new opportunities for applications requiring a balance of impact strength, ductility, and thermal stability. These advancements indicate a promising future for composite materials in various applications.

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来源期刊
Composites Part C Open Access
Composites Part C Open Access Engineering-Mechanical Engineering
CiteScore
8.60
自引率
2.40%
发文量
96
审稿时长
55 days
期刊最新文献
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