Extraordinary solution-processability of lignin in phenol-maleic anhydride and dielectric films with controllable properties
Extraordinary solution-processability of lignin in phenol-maleic anhydride and dielectric films with controllable properties
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木质素在苯酚-马来酸酐和介电薄膜中具有卓越的溶液加工性能，且性能可控
DOI：
10.1039/c9ta06665a
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发表时间：
2019-10-28
影响因子：
11.9
通讯作者：
Wang, Qingwen
中科院分区：
文献类型：
--
作者：
Fan, Qi;Liu, Tao;Wang, Qingwen
高效且具有成本竞争力的木质素溶解对于木质素废物流的增值利用至关重要。在这里，开发了一种新型的和具有成本效益的包括苯酚和马来酸酐的超分子低共熔液体（苯酚-MAH），其可以在室温下以超高固体负载（> 50重量%）快速溶解木质素。苯酚-MAH中约70重量%的木质素负载导致木质素的高度内聚的橡皮泥状态，这在木质素基材料中是前所未有的。实验和计算方法表明，强π堆积和氢键相互作用的合作是负责非凡的解决方案，加工性的木质素在苯酚-马来酸酐。木质素的相容性和活性增强也归因于酚-MAH的酚化和酰化。此外，苯酚-MAH被应用于开发可再生的木质素基介电膜而无需溶剂去除。所得到的具有纳米网络结构的膜显示高度可调的介电性能归因于α分散和麦克斯韦-瓦格纳效应。交联密度的调节通过改变木质素负载导致膜的可控机械性能（例如屈服应力，0.05 - 31.50MPa）。定制的性能表明，生物膜可用作瞬态电子器件的可再生介电材料。可扩展的苯酚-MAH策略有望促进具有高木质素负载的新型功能生物材料的制备。
Highly efficient and cost-competitive dissolution of lignin is vital to value-added utilization of lignin waste streams. Here, a novel and cost-efficient supramolecular eutectic liquid (phenol-MAH) comprising phenol and maleic anhydride was developed, which can rapidly dissolve lignin with ultrahigh-solid loading (>50 wt%) at room temperature. About 70 wt% lignin loading in phenol-MAH leads to a highly cohesive plasticine state of lignin, which is unprecedented in lignin-based materials. Experimental and computational approaches revealed that the cooperation of strong pi-stacking and hydrogen-bonding interactions is responsible for the extraordinary solution-processability of lignin in phenol-MAH. Enhanced compatibility and activity of lignin are also ascribed to the phenolation and acylation of phenol-MAH. Furthermore, phenol-MAH was applied to develop renewable lignin-based dielectric films without solvent removal. The resulting films with a nano-network structure display highly tunable dielectric properties attributed to alpha-dispersion and the Maxwell-Wagner effect. The modulation of the crosslinking density leads to controllable mechanical properties (e.g. yield stress, 0.05-31.50 MPa) of the films by changing lignin loading. The tailored performance demonstrates that the bio-film can be used as a renewable dielectric material for transient electronics. The scalable phenol-MAH strategy is expected to facilitate the fabrication of novel functional bio-materials with high lignin-loading.