Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 19, Issue 38, Pages 7098-7105Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b908220d
Keywords
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Funding
- National Basic Research Program of China [2005CB623800]
- NSF of China [50573014, 50773012]
- Shanghai Basic Research Program [05JC14002]
- NSFC [20221402]
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For developing high performance graphene-based nanocomposites, dispersal of graphene nanosheets in polymer hosts and precise interface control are challenging due to their strong interlayer cohesive energy and surface inertia. Here we report an efficient method to functionalize graphene nanosheets. The initiator molecules were covalently bonded to the graphene surface via a diazonium addition and the succeeding atom transfer radical polymerization linked polystyrene chains (82 wt% grafting efficiency) to the graphene nanosheets. The prominent confinement effect arising from nanosheets resulted in a 15 degrees C increase in the glass transition temperature of polystyrene compared to the pure polymer. The resulting polystyrene nanocomposites with 0.9 wt% graphene nanosheets revealed around 70% and 57% increases in tensile strength and Young's modulus. The protocol is believed to offer possibilities for optimizing the processing properties and interface structure of graphene-polymer nanocomposites.
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