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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Folding Large Graphene‐on‐Polymer Films Yields Laminated Composites with Enhanced Mechanical Performance

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Title
Folding Large Graphene‐on‐Polymer Films Yields Laminated Composites with Enhanced Mechanical Performance
Author
Wang, BinLi, ZhanchengWang, ChunhuiSignetti, StefanoCunning, Benjamin V.Wu, XiaozhongHuang, YuanJiang, YiShi, HaofeiRyu, SeunghwaPugno, Nicola M.Ruoff, Rodney S.
Keywords
composites; folding; graphene; mechanical reinforcement
Issue Date
201808
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.30, no.35, pp.1707449 -
Abstract
A folding technique is reported to incorporate large‐area monolayer graphene films in polymer composites for mechanical reinforcement. Compared with the classic stacking method, the folding strategy results in further stiffening, strengthening, and toughening of the composite. By using a water–air‐interface‐facilitated procedure, an A5‐size 400 nm thin polycarbonate (PC) film is folded in half 10 times to a ≈0.4 mm thick material (1024 layers). A large PC/graphene film is also folded by the same process, resulting in a composite with graphene distributed uniformly. A three‐point bending test is performed to study the mechanical performance of the composites. With a low volume fraction of graphene (0.085%), the Young's modulus, strength, and toughness modulus are enhanced in the folded composite by an average of 73.5%, 73.2%, and 59.1%, respectively, versus the pristine stacked polymer films, or 40.2%, 38.5%, and 37.3% versus the folded polymer film, proving a remarkable mechanical reinforcement from the combined folding and reinforcement of graphene. These results are rationalized with combined theoretical and computational analyses, which also allow the synergistic behavior between the reinforcement and folding to be quantified. The folding approach could be extended/applied to other 2D nanomaterials to design and make macroscale laminated composites with enhanced mechanical properties.
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DOI
http://dx.doi.org/10.1002/adma.201707449
ISSN
0935-9648
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