Preparation of Mesophase Pitch-Based Carbon Foams with Supercritical Toluene

被引:4
作者
Lu, Yonggen [1 ]
Li, Zhiqiang [1 ]
Wang, Peng [1 ]
Yang, Changling [2 ]
机构
[1] Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China
[2] Donghua Univ, Coll Chem & Chem Engn, Shanghai 201620, Peoples R China
基金
中国国家自然科学基金;
关键词
blowing agents; inorganic materials; nucleation; PRESSURE; DIOXIDE; GROWTH;
D O I
10.1002/app.33607
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Mesophase pitch-based carbon foams were prepared with supercritical toluene. The effects of the foaming conditions, such as the solvent proportions, temperatures, initial pressures, and pressure drop rates, on the cell densities and mean cell diameters of the carbon foams were studied. The foaming mechanism was analyzed with the theories of homogeneous nucleation. The carbon foams varied in cell densities and cell structure from three-dimensional interconnected to closed sizing in the range 200 to 800 mu m when they were generated under different conditions. The carbon foam structure could be optimized with cell densities of 10-16 x 10(3) cm(-3) and cell diameters from 400 to 450 mu m, under the conditions where the temperature was 588 K, the initial pressure was 3.0 MPa, the pressure drop rate was 1.5 MPa/s, and the solvent proportion was 30 wt %. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 336-341, 2011
引用
收藏
页码:336 / 341
页数:6
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