The Impact of Composition and Morphology on Ionic Conductivity of Silk/Cellulose Bio-Composites Fabricated from Ionic Liquid and Varying Percentages of Coagulation Agents
The Impact of Composition and Morphology on Ionic Conductivity of Silk/Cellulose Bio-Composites Fabricated from Ionic Liquid and Varying Percentages of Coagulation Agents
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DOI：
10.3390/ijms21134695
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发表时间：
2020-07-01
影响因子：
5.6
通讯作者：
Salas-de la Cruz, David
中科院分区：
文献类型：
--
作者：
Blessing, Bailey;Trout, Cory;Salas-de la Cruz, David
由多糖和结构蛋白之间的静电和疏水相互作用产生的共混生物复合材料表现出有用的和独特的性质。然而，将这些生物聚合物工程化为适用的形式是具有挑战性的，这是由于材料的物理化学性质与其形态的耦合，以及控制这一点所带来的任务。在这项特定的研究中，许多性能的桑蚕丝和微晶纤维素生物复合材料共混使用离子液体和再生与各种凝固剂进行了研究。具体而言，使用多种表征技术探索多糖-蛋白质生物电解质膜的组成与所得形态和离子电导率之间的关系，所述表征技术包括扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）、差示扫描量热法（DSC）、X射线散射、基于纳米压痕的原子力显微镜（AFM）、和介电弛豫光谱（DRS）。结果表明，当丝是生物复合材料中的主要组分时，离子电导率较高，这也与较高的β-折叠含量相关。然而，当纤维素成为生物复合材料中的主要组分时，没有观察到这种关系;相反，纤维素半结晶性和机械性能主导离子传导。
Blended biocomposites created from the electrostatic and hydrophobic interactions between polysaccharides and structural proteins exhibit useful and unique properties. However, engineering these biopolymers into applicable forms is challenging due to the coupling of the material's physicochemical properties to its morphology, and the undertaking that comes with controlling this. In this particular study, numerous properties of theBombyx morisilk and microcrystalline cellulose biocomposites blended using ionic liquid and regenerated with various coagulation agents were investigated. Specifically, the relationship between the composition of polysaccharide-protein bio-electrolyte membranes and the resulting morphology and ionic conductivity is explored using numerous characterization techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray scattering, atomic force microscopy (AFM) based nanoindentation, and dielectric relaxation spectroscopy (DRS). The results revealed that when silk is the dominating component in the biocomposite, the ionic conductivity is higher, which also correlates with higher beta-sheet content. However, when cellulose becomes the dominating component in the biocomposite, this relationship is not observed; instead, cellulose semicrystallinity and mechanical properties dominate the ionic conduction.