Abstract
The lignin aerogels that are both high porosity and compressibility would have promising implications for bioengineering field to sound-adsorption and damping materials; however, creating this aerogel had a challenge to adhesive lignin. Here we reported cellulose as green adhesion agent to synthesize the aerogels with strong mechanical performance. Our approach—straightforwardly dissolved in ionic liquids and simply regenerated in the deionized water—causes assembly of micro-and nanoscale and even molecule level of cellulose and lignin. The resulting lignin aerogels exhibit Young’s modulus up to 25.1 MPa, high-efficiency sound-adsorption and excellent thermal insulativity. The successful synthesis of this aerogels developed a path for lignin to an advanced utilization.
Highlights
In recent years, there has been increasing interest in the utilization of bio-renewable feedstocks as advanced materials
Anions and cations of the butyl-3-methylimidazolium chloride (BMIMCl) form electro donor-acceptor (EDA) with the oxygen and hydrogen atoms of the C-6 and C-3 hydroxyl groups of adjacent cellulose chains[29]. These interactions result in the separation of different nanofibrils of cellulose and make it dissolved in the ionic liquids
Lignin aerogels of cellulose as adhesion agent were successfully prepared by dissolving cellulose and lignin powders in BMIMCl, regenerating in the deionized water and freezing drying process
Summary
There has been increasing interest in the utilization of bio-renewable feedstocks as advanced materials. The second most abundant biopolymer after cellulose[8], was an interesting candidate It has a rigid, hyperbranched macromolecular structure composed of three different types of phenylpropane units and various functional groups, such as ether, hydroxyl, methoxy, aldehyde, and ester groups[9,10,11,12,13]. The most abundant renewable natural polymer[19,20], possesses many useful features, such as hydrophilicity, biocompatibility, hydroxyl reactivity, and reasonable thermal and mechanical stabilities[21,22]. It can be used as a green and renewable adhesion agent due to much hydroxyl group intro-molecule[23]. After solvent exchange processing and further freeze drying, the obtained aerogels possessed strong mechanical performance, high-efficiency sound-adsorption, excellent thermal insulativity and high special surface area
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