Ductile, High-Lignin-Content Thermoset Films and Coatings.
Ductile, High-Lignin-Content Thermoset Films and Coatings.
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DOI：
10.1021/acssuschemeng.3c03030
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发表时间：
2023-11-20
影响因子：
8.4
通讯作者：
Klok, Harm-Anton
中科院分区：
文献类型：
--
作者：
Boarino, Alice;Charmillot, Justine;Figueiredo, Monique Bernardes;Le, Thanh T. H.;Carrara, Nicola;Klok, Harm-Anton
在向更可持续利用自然资源过渡的背景下，木质素替代常用的石油基塑料的应用可以发挥关键作用。尽管木质素以低成本高度可获得并且呈现出令人感兴趣的性质，例如抗氧化剂和UV阻隔活性，但其应用受到其低反应性的限制，这是通常用于从生物质中提取木质素的苛刻条件的结果。在这项工作中，使用乙醛酸木质素（GA木质素），富含羧酸基团，因此对环氧交联剂具有高度反应性。GA木质素是通过一步脱水辅助分级过程直接从生物质中提取的，其允许通过与可持续的聚（乙二醇）二缩水甘油醚和甘油二缩水甘油醚交联剂的简单反应来制备热固性膜和涂层。这允许制备含有高达70重量%的木质素的具有可调机械性能的独立膜和含有高达90重量%的木质素的具有高耐溶剂性的共价表面附着涂层。这两种薄膜和涂料都具有抗氧化性能，并且联合收割机结合了优异的紫外线阻隔活性和高可见光透明度，这对于可持续食品包装的应用具有吸引力。乙醛酸木质素是一种易于大量获得的生物质衍生聚合物，可用于制备热固性薄膜和涂层，其特性使其对食品包装应用具有吸引力。
In the context of transitioning toward a more sustainable use of natural resources, the application of lignin to substitute commonly utilized petroleum-based plastics can play a key role. Although lignin is highly available at low cost and presents interesting properties, such as antioxidant and UV barrier activities, its application is limited by its low reactivity, which is a consequence of harsh conditions normally used to extract lignin from biomass. In this work, the use of glyoxylic acid lignin (GA lignin), rich in carboxylic acid groups and hence highly reactive toward epoxy cross-linkers, is presented. GA lignin, which is directly extracted from biomass via a one-step aldehyde-assisted fractionation process, allowed the preparation of thermoset films and coatings via a simple reaction with sustainable poly(ethylene glycol) diglycidyl ether and glycerol diglycidyl ether cross-linkers. This allows one to prepare freestanding films containing up to 70 wt % lignin with tunable mechanical properties and covalently surface-attached coatings containing up to 90 wt % lignin with high solvent resistance. Both films and coatings display antioxidant properties and combine excellent UV barrier activity with high visible transparency, which is attractive for applications in sustainable food packaging. Glyoxylic acid lignin, a biomass-derived polymer easily available in high quantity, can be used to prepare thermoset films and coatings with properties that make them attractive for food packaging applications.
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影响因子：
5.6
作者：
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Klok, Harm-Anton
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