Development of Lignin Supramolecular Hydrogels with Mechanically Responsive and Self-Healing Properties
Development of Lignin Supramolecular Hydrogels with Mechanically Responsive and Self-Healing Properties
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DOI：
10.1021/acssuschemeng.5b00405
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发表时间：
2015-09-01
影响因子：
8.4
通讯作者：
Loh, Xian Jun
中科院分区：
文献类型：
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作者：
Kai, Dan;Low, Zhi Wei;Loh, Xian Jun
由于化石燃料的枯竭和环境利用的增加，由可再生木质素开发功能聚合物是有吸引力的。通过原子转移自由基聚合（ATRP）制备了一系列聚乙二醇甲基醚甲基丙烯酸酯（PEGMA）接枝木质素超支化共聚物。这些共聚物的化学结构，分子特性和热性能进行了评估，并通过调整PEGMA-木质素的重量比，在38.7至65.0 kDa的分子量范围内制备这样的共聚物。由于它们的超支化结构，发现它们的水溶液在α-环糊精（α-CD）的存在下形成具有1重量%共聚物的非常低的临界凝胶化浓度的超分子水凝胶。超分子组装体的流变性能进行了研究，这些水凝胶系统显示出可调的机械响应和优异的自修复能力。结合良好的生物相容性，这些新型的基于木质素-PEGMA/环糊精包合的绿色超分子水凝胶是潜在的有用的智能生物材料的生物医学应用。
The development of functional polymers from renewable lignin is attractive due to the depletion of fossil fuel and increasing environmental usage. A series of poly(ethylene glycol) methyl ether methacrylate (PEGMA)-grafted lignin hyperbranched copolymers were prepared by atom transfer radical polymerization (ATRP). The chemical structures, molecular characteristic and thermal properties of these copolymers were evaluated and such copolymers were prepared in a range of molecular weights from 38.7 to 65.0 kDa by adjusting the PEGMA-to-lignin weight ratio. As a result from their hyperbranch architecture, their aqueous solutions were found to form supramolecular hydrogels with a very low critical gelation concentration of 1 wt % copolymers, in the presence of alpha-cyclodextrin (alpha-CD). The rheological properties of the supramolecular assemblies were investigated and these hydrogel systems showed tunable mechanical response and excellent self-healing capability. Combined with good biocompatibility, these new types of green supramolecular hydrogels based on lignin-PEGMA/cyclodextrin inclusion are potentially useful as a smart biomaterial for biomedical application.