Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 33, Issue 8, Pages 628-634Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201100674
Keywords
graphene; mechanical properties; polyurethane; shape memory; transparency
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Funding
- MEXT, Japan
- Research Center for the Exotic NanoCarbon under JST
- NSF [10-04147]
- Regional Innovation Cluster Program of Nagano
- Grants-in-Aid for Scientific Research [22510112] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1004147] Funding Source: National Science Foundation
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We report a mechanically strong, electrically and thermally conductive, and optically transparent shape-memory polyurethane composite which was fabricated by introducing a small amount (0.1 wt%) of high-quality graphene as a filler. Geometrically large (similar to 4.6 mu m2), but highly crystallized few-layer graphenes, verified by Raman spectroscopy and transmission electron microscopy, were prepared by the sonication of expandable graphite in an organic solvent. Oxygen- containing functional groups at the edge plane of graphene were crucial for an effective stress transfer from the graphene to polyurethane. Homogeneously dispersed few-layered graphene enabled polyurethane to have a high shape recovery force of 1.8 MPa cm-3. Graphene, which is intrinsically stretchable up to 10%, will enable high-performance composites to be fabricated at relatively low cost and we thus envisage that such composites may replace carbon nanotubes for various applications in the near future.
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