Lignin nanoparticles as nano-spacers for tuning the viscoelasticity of cellulose nanofibril reinforced polyvinyl alcohol-borax hydrogel
Lignin nanoparticles as nano-spacers for tuning the viscoelasticity of cellulose nanofibril reinforced polyvinyl alcohol-borax hydrogel
复制标题
DOI：
10.1016/j.eurpolymj.2018.08.028
复制
发表时间：
2018-10-01
影响因子：
6
通讯作者：
Dai, Hongqi
中科院分区：
文献类型：
--
作者：
Bian, Huiyang;Jiao, Liang;Dai, Hongqi
为了满足从生物支架、培养基质到响应电子器件等各种应用对高性能自愈合水凝胶的日益增长的需求，木素纳米颗粒复合水凝胶通过动态可逆的二醇-硼砂键和线性聚乙烯醇(PVA)和纤维素纳米纤维(CNF)组装而成。木质素纳米颗粒(LNP)作为纳米间隔物填充在三维网络中，提高了水凝胶的粘弹性和热稳定性。随着LNP含量的增加，复合水凝胶的储能模数和损耗模数最高，分别为8504pA和3260pA，分别是未加LNP水凝胶的28倍和18倍。得到的水凝胶在连续阶跃应变下表现出多孔的网络结构和良好的恢复行为。总体而言，这项工作展示了一种将纳米级构建块转移到具有可调动态流变性的3D聚合物材料上的简便方法，并可能为合理设计适用于高流变性应用的功能水凝胶提供新的前景。
To face the increasing demand of self-healing hydrogels with high performance for various applications ranging from bioscaffolds, culture matrices to responsive electronic devices, lignin nanoparticle-containing composite hydrogels are assembled via dynamic reversible didiol-borax linkages and linear polyvinyl alcohol (PVA) and cellulose nanofibrils (CNF). Lignin nanoparticles (LNP) acted as nano-spacers to fill the three-dimensional network, leading to enhanced viscoelasticity and thermal stability of hydrogel. With the increased LNP content, composite hydrogel exhibited the highest storage modulus and loss modulus of 8504 Pa and 3260 Pa, respectively, 28 times and 18 times greater than pure hydrogel without LNP. The resulting hydrogel showed porous network structure and excellent recovery behavior under continuous step strain. In general, this work demonstrates a facile approach to transfer nanoscale building blocks to 3D polymeric materials with tunable dynamic rheology properties and may provide a new prospect for the rational design of functional hydrogels for applications that require high rheological property.