Journal
POLYMER
Volume 77, Issue -, Pages 55-63Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2015.09.008
Keywords
Fluoropolymers; Carbon nanotubes; Block copolymers
Categories
Funding
- International Collaborative R&D Program - Ministry of Trade, Industry, and Energy, (MOTIE, Korea) [N0000678]
- Materials Architecturing Research Center of Korea Institute of Science and Technology (KIST)
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Poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE)/SWCNT nanocomposites with ultra-low percolation threshold were prepared by interfacial control using a block copolymer comapatibilizer. For this, a well-defined block copolymer of poly(3-hexylthiophene) (P3HT) and poly(methyl methacrylate) (PMMA) (P3HT-b-PMMA) was synthesized by combination of GRIM and ATRP (M-n = 24 K, M-w/M-n = 1.25), where the P3HT block segment wrapped the SWCNTs by pi-pi interaction and the resulting PMMA block segment dangled from the SWCNTs, which gave de-bundled SWCNTs without any aggregations for over 5 months in most common organic solvents for PMMA. The block copolymer coated SWCNT (TMCNT) was then mixed with PVDF-TrFE to prepare PVDF-TrFE/SWCNT nanocomposites (PVT-TMCNT), which enabled excellent dispersion of SWCNT in a PVDF-TrFE matrix without aggregation due to the miscibility of the PMMA on TMCNT and PVDF-TrFE. Obtained PVT-TMCNT showed large enhancements of the electrical conductivity and the dielectric constant with ultra-low percolation threshold (f(c) = 0.07 wt.%) due to excellent interfacial control by the block copolymer comapatibilizer between SWCNT and PVDF-TrFE. Improved ferroelectric properties of PVT-TMCNT were also observed by an increase of field-induced polarization response, which was almost over 10-times higher than for neat PVDF-TrFE. (C) 2015 Elsevier Ltd. All rights reserved.
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