A novel starch-enhanced melamine-formaldehyde aerogel with low volume shrinkage and high toughness
A novel starch-enhanced melamine-formaldehyde aerogel with low volume shrinkage and high toughness
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DOI：
10.1007/s10934-017-0371-8
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发表时间：
2017-02
影响因子：
2.6
通讯作者：
Yong Zhang;Jiayi Zhu;Hongbo Ren;Y. Bi;Xianpan Shi;Bin Wang;Lin Zhang
中科院分区：
文献类型：
--
作者：
Yong Zhang;Jiayi Zhu;Hongbo Ren;Y. Bi;Xianpan Shi;Bin Wang;Lin Zhang
以三聚氰胺、淀粉和甲醛为原料，在超临界条件下用二氧化碳萃取湿凝胶中的溶剂，制备了一种低体积收缩、高韧性的新型杂化气凝胶。用游标卡尺测量湿凝胶和气凝胶的尺寸，气凝胶的体积收缩率低至1.8%。BET和SEM结果表明，混合气凝胶属于介孔材料，具有典型的三维多孔结构，比表面积约为366.2 m2/g，孔径约为12.9 nm。为了研究混合气凝胶的力学性能，我们测量了压缩应力作为应变的函数，混合气凝胶具有良好的弹性和机械耐久性。
A new hybrid aerogel with low volume shrinkage and high toughness was prepared by aqueous condensation of melamine, starch and formaldehyde and extracting the solvent from the wet gel with carbon dioxide under the supercritical condition. The sizes of the wet gel and aerogel were measured by vernier calipers and the volume shrinkage of the aerogel was as low as 1.8%. The results from BET and SEM indicated that the hybrid aerogel belonged to the mesoporous material, which showed a typical three-dimensional porous structure with a specific surface area about 366.2 m2/g and pore diameter about 12.9 nm. To study the mechanical properties of the hybrid aerogel, we measured the compressive stress as a function of strain and the hybrid aerogel demonstrated excellent elasticity and mechanical durability.