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来自建筑拆除废物（CDW）的酯化木质素作为聚乳酸（PLA）复合材料的通用添加剂——人工老化对其性能的影响。

Esterified Lignin from Construction and Demolition Waste (CDW) as a Versatile Additive for Polylactic-Acid (PLA) Composites-The Effect of Artificial Weathering on its Performance.

作者信息

Anugwom Ikenna, Lahtela Ville, Hedenström Mattias, Kiljunen Samantha, Kärki Timo, Kallioinen-Mänttäri Mari

机构信息

RE-Source Platform LUT University Lappeenranta FI-53851 Finland.

Fiber Composite Laboratory LUT University Lappeenranta FI-53851 Finland.

出版信息

Glob Chall. 2022 Jun 11;6(8):2100137. doi: 10.1002/gch2.202100137. eCollection 2022 Aug.

DOI:10.1002/gch2.202100137
PMID:35958830
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9360346/
Abstract

Demand for sustainable packaging and building materials has increased the need for biobased additives. Biocomposites can often be exposed to different weather conditions and UV irradiation. Thus, additives to prevent the negative impact of weathering are generally added to composites. This study aims to evaluate using esterified lignin as an additive against weathering effects in polylactic-acid (PLA) composites. Lignin is extracted from construction and demolition waste (CDW) wood using a deep eutectic solvent then esterified and tested as an additive in the fabrication of bio-based composites. For comparison, lignin from birch is used as a raw material for an additive. Esterification is confirmed by solid-state NMR analysis. Samples are exposed to artificial weathering for 700 hours and their impact strength and color change properties are measured. The results indicate that esterified lignin from CDW (CDW e-lignin) as an additive protects the biocomposite from the weathering impact. The sample containing the CDW e-lignin as an additive suffers only a 4.3% of reduction of impact strength, while the samples that contain commercial additives lose clearly more of their impact strength (from 23.1% to 61.1%). Based on the results CDW e-lignin is a good additive to prevent weathering. As a conclusion, the esterified lignin from CDW, is a versatile additive for composite production.

摘要

对可持续包装和建筑材料的需求增加了对生物基添加剂的需求。生物复合材料经常会暴露在不同的天气条件和紫外线辐射下。因此，通常会向复合材料中添加防止风化负面影响的添加剂。本研究旨在评估使用酯化木质素作为添加剂对聚乳酸（PLA）复合材料风化效果的影响。木质素是从建筑和拆除废物（CDW）木材中使用深共熔溶剂提取的，然后进行酯化，并作为添加剂用于生物基复合材料的制造。为了进行比较，将桦木木质素用作添加剂的原材料。通过固态核磁共振分析确认酯化反应。将样品暴露在人工风化环境中700小时，并测量其冲击强度和颜色变化特性。结果表明，作为添加剂的CDW酯化木质素（CDW e-木质素）可保护生物复合材料免受风化影响。含有CDW e-木质素作为添加剂的样品冲击强度仅降低4.3%，而含有商业添加剂的样品冲击强度明显损失更多（从23.1%到61.1%）。基于这些结果，CDW e-木质素是一种防止风化的良好添加剂。总之，CDW酯化木质素是复合材料生产的一种通用添加剂。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/d8678fe68cce/GCH2-6-2100137-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/81b307a45018/GCH2-6-2100137-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/ab569e731255/GCH2-6-2100137-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/f2e0fa39d782/GCH2-6-2100137-g004.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/28f67ca18fb6/GCH2-6-2100137-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/e7ec6f5d76fa/GCH2-6-2100137-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/d8678fe68cce/GCH2-6-2100137-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/81b307a45018/GCH2-6-2100137-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/ab569e731255/GCH2-6-2100137-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/f2e0fa39d782/GCH2-6-2100137-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/4c7939daac0a/GCH2-6-2100137-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/28f67ca18fb6/GCH2-6-2100137-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/e7ec6f5d76fa/GCH2-6-2100137-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2323/9360346/d8678fe68cce/GCH2-6-2100137-g002.jpg

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