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首页> 外文期刊>RSC Advances >Green bio-based aerogels prepared from recycled cellulose fiber suspensions
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Green bio-based aerogels prepared from recycled cellulose fiber suspensions

机译：由回收的纤维素纤维悬浮液制备的绿色生物基气凝胶

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摘要

Recycled cellulose fibers (RCF) from waste paper were utilized to prepare bio-based aerogels through an environmentally friendly freeze-drying method. Food thickening agent sodium carboxymethyl cellulose (CMC) served as a matrix in the bio-aerogels. The microstructures and mechanical properties of the aerogels have been studied as a function of RCF/CMC content. Sodium montmorillonite (Na+-MMT) and ammonium polyphosphate (APP) were added to enhance the thermal stability and flame retardancy, which were investigated by thermogravimetric analysis (TGA) and cone calorimetry respectively. It was found that the Na+-MMT significantly improved the fire retardancy of the aerogels and APP played a synergistic effect with it. The initial decomposition temperature increased by 15 degrees C and the peak of heat release rate decreased from 90 to 49.5 kW m(-2) in the presence of 33% clay. Addition of APP further increased the residue amount and reduced the fire growth rate. Fourier transform infrared spectroscopy (FTIR) was used to analyse the char formed after cone calorimeter tests.
机译：利用废纸回收的纤维素纤维（RCF）通过环保的冻干方法制备生物基气凝胶。食品增稠剂羧甲基纤维素钠（CMC）在生物气凝胶中用作基质。气凝胶的微观结构和力学性能已作为RCF / CMC含量的函数进行了研究。添加蒙脱土钠（Na + -MMT）和聚磷酸铵（APP）以提高热稳定性和阻燃性，分别通过热重分析（TGA）和锥热法进行了研究。发现Na + -MMT显着改善了气凝胶的阻燃性，APP起到了协同作用。在存在33％粘土的情况下，初始分解温度提高了15摄氏度，放热速率的峰值从90降低至49.5 kW m（-2）。添加APP进一步增加了残留量，降低了火势增长速度。傅里叶变换红外光谱（FTIR）用于分析锥量热仪测试后形成的碳。

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