Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 297, Issue 4, Pages 303-311Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201100211
Keywords
graphene; nanocomposites; polyimides
Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology, Korea (MEST) [2011-0000385, 2011-0001667/2011-0001668]
- WCU
- Ministry of Knowledge Economy, Korea
- MEST
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Transparent polyimide (PI) and chemically modified graphene nanocomposite films are prepared from solutions of pyromellitic dianhydride (PMDA)/4,4'-oxydianiline (ODA) poly(amic acid) with various amounts (0.20.8?wt%) of graphene carboxylic acid (GCA) in DMAc. The GCA is synthesized by modifying chemically oxidized graphene (COG) with many carboxylic acid groups (COOH) and is well-dispersed in DMAc, the organic solvent most frequently used for PI synthesis. The GCA sheets in the PI/GCA composite films are well-dispersed and aligned two-dimensionally in the direction parallel to the PI films, which enhances the mechanical properties of the nanocomposite films.
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