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UV-protection from chitosan derivatized lignin multilayer thin film

机译：乌维保护壳聚糖衍生的木质素多层薄膜

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Lignin is one of the most abundant renewable materials on the earth. Despite possessing useful antioxidant and UV absorbing properties, its effective utilization in technology has been hampered by its relative insolubility and difficulty to process. In this work, a simple chemical derivatization process is utilized which yields water-soluble lignin possessing anionic carboxylate groups. These carboxylate groups give lignin polyanionic behavior and enable its utilization in the growth of a functional film via layer-by-layer (LbL) assembly with biologically sourced chitosan. The growth mechanism of this film is hypothesized to be a result of both hydrogen bonding and ionic interactions. The film demonstrates excellent UV-absorptive capability. A 100 nm thick chitosan/lignin coating was applied to a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) film and shown to reduce its degradation sixfold over the course of a 1 hour exposure to harsh UV light. This is the first demonstration of lignin being utilized in a fully biologically derived LbL film. Utilization of lignin in LbL assembly is an important step in the development of renewable nanotechnology.
机译：木质素是地球上最丰富的可再生材料之一。尽管具有有用的抗氧化和UV吸收性能，但其技术的有效利用率被其相对渗透性和工艺难度所阻碍。在这项工作中，利用了简单的化学衍生化方法，其产生具有阴离子羧酸酯基团的水溶性木质素。这些羧酸盐基团使木质素多阴离子行为产生，并且能够通过逐层（LBL）组件在具有生物学上的壳聚糖的逐层（LBL）组件的生长中的利用。该薄膜的生长机制被假设为氢键和离子相互作用的结果。这部电影显示出优异的紫外线吸收能力。将100nm厚的壳聚糖/木质素涂层涂布在聚（苯乙烯磺酸盐）膜上，并显示在1小时暴露于苛刻的紫外线的过程中降低其降低六倍。这是在完全生物衍生的LBL膜中使用木质素的第一次演示。 Lignin在LIGNIN在LINGE组件中的利用是可再生纳米技术发展的重要一步。

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