Pore structure control of mesoporous carbon monoliths derived from mixtures of phenolic resin and ethylene glycol
Pore structure control of mesoporous carbon monoliths derived from mixtures of phenolic resin and ethylene glycol
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DOI：
10.1016/j.carbon.2009.03.069
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发表时间：
2009-07-01
期刊：
影响因子：
10.9
通讯作者：
Lu, Tianjian
中科院分区：
文献类型：
--
作者：
Xu, Shunjian;Lie, Jie;Lu, Tianjian
基于聚合诱导相分离的方法制备了由酚醛树脂混合物衍生的介孔碳整料。系统研究了树脂混合物的组成和树脂固化温度对碳整体孔结构的影响，重点是控制表观孔隙率和孔径分布。引入分形维数来评估碳块的形态。结果表明，获得了孔径分布窄的介孔碳整体材料。碳整体材料的孔结构可以通过改变树脂固化温度以及树脂混合物中乙二醇、固化催化剂和水的含量来控制。碳块的表观孔隙率从54.27%到26.83%不等。当使用更多的乙二醇和更高的树脂固化温度时，碳整体件具有更窄的孔径分布。当用过量的水（9.8 wt%）制备初始树脂样品时，碳块的孔结构会发生根本性的变化，即获得具有海绵结构的多孔碳泡沫。碳整体继承了预固化树脂的孔隙率，它是由于富含树脂和富含乙二醇相的相分离而形成的。体积收缩对碳整体体的孔结构有一定的影响。 (C) 2009 Elsevier Ltd. 保留所有权利。
Mesoporous carbon monoliths derived from phenolic resin mixtures have been prepared in the process based on polymerization-induced phase separation. The effect of the composition of resin mixtures and the resin curing temperature on the pore structure of carbon monoliths has been systematically investigated, with emphasis on controlling the apparent porosity and pore size distribution. Fractal dimensions have been introduced to evaluate the morphologies of the carbon monoliths. The results showed that mesoporous carbon monoliths with narrow pore size distribution were obtained. The pore structure of carbon monoliths could be controlled by changing the resin curing temperature and the content of ethylene glycol, curing catalyst and water in the resin mixtures. The apparent porosity of carbon monoliths varied from 54.27% to 26.83%. Carbon monoliths had narrower pore size distribution when more ethylene glycol and higher resin curing temperature were employed. The pore structure of carbon monoliths would be changed radically when the initial resin samples were prepared with excess water (9.8 wt%), i.e. porous carbon foams with sponge structure were obtained. Carbon monoliths inherit their porosity from precursing cured resins where it was formed as a result of phase separation of resin-rich and glycol-rich phases. Volume contraction had certain effect on the pore structure of carbon monoliths. (C) 2009 Elsevier Ltd. All rights reserved.