Highly stretchable dielectric nanocomposites based on single-walled carbon nanotube/ionic liquid gels
- Highly stretchable dielectric nanocomposites based on single-walled carbon nanotube/ionic liquid gels
- 오기원; 이장열; 이상수; 박민; 김대흠; 김희숙
- Polymer-matrix composites (PMCs); Flexible composites; Carbon nanotubes; Mechanical properties; Electrical properties
- Issue Date
- Composites science and technology
- VOL 83, 40-46
- We fabricated a highly stretchable dielectric composite using ionic liquid-based single-walled carbon
nanotube gel (IL-SWCNT) as a dielectric filler and polydimethylsiloxane (PDMS) as an elastomer matrix.
Transmission electron microscopy images showed that the SWCNTs were highly exfoliated and dispersed
in the polymer matrix due to the addition of the ionic liquid (IL). The dielectric constant at 100 Hz of the
IL-SWCNT/PDMS composite containing 1.6 wt% SWCNTs was twice that of the SWCNT/PDMS composite
without IL, and the dielectric loss was one fifth that of the SWCNT/PDMS composite. In addition, the elastic
modulus of the IL-SWCNT/PDMS composite was significantly lower (0.36 MPa at a strain of 20%) and
the strain at break was higher (350%) compared to the corresponding values of the SWCNT/PDMS composites
due to the plasticizer effects of the IL. These results provide the first feasibility study of the use of
IL as both an exfoliation agent and a plasticizer in an effort to simultaneously improve the dielectric and
mechanical properties of CNT-filled dielectric elastomers.
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