Fabrication of carbon foams with high mechanical properties derived from sucrose/polyacrylamide hydrogel

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• 作者：Yao Yao ; Fei Chen ; ^{chenfei027@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Xi Chen ; Qiang Shen ; Lianmeng Zhang
• 关键词：Carbon foams ; Material design ; Mechanical properties
• 刊名：Diamond & Related Materials
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：64
• 期：Complete
• 页码：153-162
• 全文大小：2624 K

文摘

The physical foaming and gel casting techniques are combined to fabricate carbon foams with high mechanical properties, which is based on the interaction of the three-dimensional polymer networks by using sucrose/polyacrylamide hydrogel as the carbon precursor. After the thermal polymerization and carbonization, a high carbon yield (94.96% of the theoretical value) of carbon foams is attributed to the high cross-linking degree of sucrose/polyacrylamide hydrogel. Besides, anionic surfactant sodium dodecyl sulfate (SDS) is utilized to enhance the foaming ability. The well-defined cell structures of carbon foams are easily controlled by adjusting the contents of sucrose and SDS. The density of carbon foams is regulated in the range of 0.17–0.93 g/cm³, whereas the compressive strength is in the range of 3.0–108.0 MPa. Carbon foams prepared by this method showed a fracture-dominated mechanical behavior and are purely brittle. Furthermore, energy as high as 23.52 MJ·m^− 3 can be absorbed when compressed.