期刊
POLYMER
卷 53, 期 12, 页码 2485-2494出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.03.012
关键词
Graphene; Poly (vinyl alcohol); Composites
资金
- NSF [MRI 04-511]
- U.S. National Science Foundation (NSF) [CBET-1032330]
- Air Force Office of Scientific Research (AFOSR) [FA9550-11-1-0027]
- New Energy and Industrial Technology Development Organization of Japan
- Oak Ridge National Laboratory
- Office of Basic Energy Sciences
- U.S. Department of Energy [2011-230]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1032330] Funding Source: National Science Foundation
In this paper, we demonstrate a facile technique to disperse pristine few-layer graphene (FLG) in water utilizing a triphenylene based stabilizer (C10) that non-covalently functionalizes the surface without micelle formation. The yield of FLG in the final dispersion (0.2 mg FLG/mg C10) is much higher than comparable surfactants and polymers stabilizers. This dispersion is reversible in response to pH changes unlike conventional stabilizers. The C10-stabilized FLG dispersion is also stable against heat and lyophilization. This non-covalent functionalization does not disrupt the pristine structure of the graphene sheets; instead, these coatings allow for stable, aggregation-resistant FLG dispersion, as characterized through TEM. To demonstrate the utility of such dispersions, we prepared pristine FLG-loaded poly (vinyl alcohol) (PVA) composites by a simple solution casting process. This is the first example of PVA composites based on pristine graphene. These composites have enhanced electrical properties at relatively low filler fraction (0.26 vol% FLG). Moreover, these composites exhibit improved mechanical properties established by tensile and hardness tests results; these data suggest anisotropic reinforcement caused by graphene alignment. (C) 2012 Elsevier Ltd. All rights reserved.
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