基于不同发泡剂的木质素基泡沫炭的制备及性能研究

doi:10.3969/j.issn.0253-2417.2020.04.009

Abstract

Abstract:

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:

TQ35

Enqing ZHU,Zhengjun SHI,Shouqing LIU,Jing YANG,Dawei WANG,Haiyan YANG. Preparation and Properties Evaluation of Lignin-based Carbon Foams with Different Foaming Agent[J]. Chemistry and Industry of Forest Products, 2020, 40(4): 63-70.

Figures/Tables 9

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References 23

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样品 sample	发泡剂 foaming agent	真密度/(g·cm^-3) true density	开孔率/% open porosity	闭孔率/% close porosity
CF-H	正己烷n-hexane	1.56	64.37	35.63
CF-ACH	活性炭负载正己烷activated carbon loaded by n-hexane	1.31	70.87	29.13
CF-P	正戊烷n-pentane	1.30	87.63	12.37

样品 sample	S_BET/ (m²·g^-1)	S_mi/ (m²·g^-1)	P_mi/%	S_ex/ (m²·g^-1)	P_ex/%	V_mi/ (cm³·g^-1)	V_me/ (cm³·g^-1)	V_to/ (cm³·g^-1)	A/nm
CF-H	42.08	38.47	91.42	3.60	8.60	0.016	0.011	0.027	7.04
CF-ACH	186.72	144.57	77.43	42.16	22.58	0.059	1.05	1.11	2.38
CF-P	471.22	421.17	89.38	50.05	10.62	0.16	1.96	2.12	1.80

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

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