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Polymers 2016, 8(3), 101; doi:10.3390/polym8030101

Amphiphilic Fluorinated Block Copolymer Synthesized by RAFT Polymerization for Graphene Dispersions

1
School of Applied Chemical Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
2
Research Institute of Advanced Energy, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
3
Department of Nano-Science and Technology, Graduate School, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Haruma Kawaguchi
Received: 31 January 2016 / Revised: 14 March 2016 / Accepted: 16 March 2016 / Published: 22 March 2016
(This article belongs to the Special Issue Selected Papers from ASEPFPM2015)
View Full-Text   |   Download PDF [4541 KB, uploaded 22 March 2016]   |  

Abstract

Despite the superior properties of graphene, the strong π–π interactions among pristine graphenes yielding massive aggregation impede industrial applications. For non-covalent functionalization of highly-ordered pyrolytic graphite (HOPG), poly(2,2,2-trifluoroethyl methacrylate)-block-poly(4-vinyl pyridine) (PTFEMA-b-PVP) block copolymers were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization and used as polymeric dispersants in liquid phase exfoliation assisted by ultrasonication. The HOPG graphene concentrations were found to be 0.260–0.385 mg/mL in methanolic graphene dispersions stabilized with 10 wt % (relative to HOPG) PTFEMA-b-PVP block copolymers after one week. Raman and atomic force microscopy (AFM) analyses revealed that HOPG could not be completely exfoliated during the sonication. However, on-line turbidity results confirmed that the dispersion stability of HOPG in the presence of the block copolymer lasted for one week and that longer PTFEMA and PVP blocks led to better graphene dispersibility. Force–distance (F–d) analyses of AFM showed that PVP block is a good graphene-philic block while PTFEMA is methanol-philic. View Full-Text
Keywords: graphene; block copolymer; RAFT polymerization; dispersion graphene; block copolymer; RAFT polymerization; dispersion
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Lee, H.M.; Perumal, S.; Cheong, I.W. Amphiphilic Fluorinated Block Copolymer Synthesized by RAFT Polymerization for Graphene Dispersions. Polymers 2016, 8, 101.

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