期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 56, 期 2, 页码 201-207出版社
ELSEVIER
DOI: 10.1016/j.supflu.2010.12.014
关键词
Graphene oxide; Polymer composite; Foaming; Supercritical carbon dioxide
资金
- Natural Science Foundation of China [50903070]
- Zhejiang Provincial Natural Science Foundation of China [Y4090363, 4090502]
- Science and Technology of Innovative Research Team of Zhejiang Province [2009R50010]
Graphene oxide (GO) was prepared by oxidation of graphite using the Hummers method, and was modified by isocyanate to obtain dispersed GO sheets in dimethylformamide. Polystyrene (PS)/GO composites were prepared by solution blending, and their morphologies and properties were characterized. The addition of GO increased the glass transition temperature of the PS/GO composites. The storage modulus and thermal stability of the composites were also improved compared with PS. Foams of PS and PS/GO composites were prepared by supercritical carbon dioxide foaming. The composite foams exhibited slightly higher cell density and smaller cell size compared with the PS foam, indicating the GO sheets can act as heterogeneous nucleation agents. (C) 2011 Elsevier B.V. All rights reserved.
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