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Chemistry and Industry of Forest Products ›› 2020, Vol. 40 ›› Issue (4): 63-70.doi: 10.3969/j.issn.0253-2417.2020.04.009

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Preparation and Properties Evaluation of Lignin-based Carbon Foams with Different Foaming Agent

Enqing ZHU1,2,Zhengjun SHI1,Shouqing LIU1,Jing YANG1,Dawei WANG1,Haiyan YANG1,*()   

  1. 1. The Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China, Southwest Forestry University, Kunming 650224, China
    2. University Key Laboratory of Biomass Chemical Refinery & Synthesis, Southwest Forestry University, Kunming 650224, China
  • Received:2020-01-14 Online:2020-08-28 Published:2020-08-21
  • Contact: Haiyan YANG E-mail:yhaiyan630@126.com


The lignin-based phenolic resin was synthesized by condensation reaction of phenol and formaldehyde, in which part of phenol was replaced with alkaline cornstalk lignin. To evaluate the effect of foaming agents on the structure property of the carbon foams, n-hexane, n-pentane and activated carbon loaded n-hexane were chosen as the foaming agents, and the prepared carbon foams were signed as CF-H, CF-P, and CF-ACH, respectively. The results indicated that the lignin-based phenolic foams prepared by different foaming agents exhibited excellent thermal stability, evidenced by the higher residual carbon recovery rate of 47.95% after thermal decomposition at 800 ℃. All of the prepared carbon foams belonged to amorphous carbon, in which non-graphitized carbonaceous structure was detected. The pore shape of CF-H, CF-P, and CF-ACH was spherical or ellipsoid with the pore size distribution of 20-300 μm, and their apparent densities ranged from 0.15 to 0.55 g/cm3. Compared with the normal carbon foams, the prepared lignin-based carbon foams had considerable compressive strength and the maximum compressive strength reached 13.13 MPa. In addition, the specific surface areas of CF-P, CF-ACH, and CF-H were 471.22 m2/g, 186.72 m2/g, and 42.08 m2/g, respectively. The pore opening rates of the carbon foams were all above 64%, and the area percentages of micropore were above 77%.

Key words: lignin, foaming agent, carbon foam

CLC Number: