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- Title
Graphene nanoribbons (GNRs) by unzipping MWCNTs for the improvement of PMMA microcellular foams.
- Authors
Li, Meijuan; Cheng, Ping; Luo, Guoqiang; Shen, Qiang; Zhang, Lianmeng
- Abstract
ABSTRACT This work presents the cellular microstructures and properties of PMMA/graphene nanoribbons (GNRs) microcellular foams. GNRs were obtained by oxidative unzipping multiwalled carbon nanotubes and solvent thermal reduction in dimethylformamide (DMF), then they were mixed with PMMA to fabricate PMMA/GNRs nanocomposites by solution blending. Subsequently, supercritical carbon dioxide (scCO2) as a friendly foaming agent was applied to fabricate PMMA/GNRs microcellular foam by a batch foaming in a special mold. The morphology of cell structure was analyzed by scanning electron microscopy and image software, showing that the addition of a smaller content of GNRs caused a fine cellular structure with a higher cell density (∼3 × 1011 cells/cm3) and smaller cell sizes (∼1 μm) due to their remarkable heterogeneous nucleation effect. The mechanical testing of PMMA/GNRs microcellular foams demonstrated that the obtained GNRs also could be used as a reinforcing filler to increase the mechanical properties of PMMA foams. An improvement in the compressive strength of ∼80% (about 39% increase standardized by specific compressive strength) was achieved by 1.5 wt % GNRs addition, and the thermal stability of PMMA/GNRs foams was enhanced too. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45182.
- Subjects
NANORIBBONS; GRAPHENE; MECHANICAL properties of polymers; NANOTUBES; FOAM
- Publication
Journal of Applied Polymer Science, 2017, Vol 134, Issue 32, pn/a
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.45182