Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 40, Pages 20011-20017Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp205444x
Keywords
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Funding
- NSF of China [50977001]
- State Key Laboratory of Power System [SKLD09KZ03]
- Ministry of Sciences and Technology of China [2008AA03Z307, 2010DFA51490]
- Program for New Century Excellent Talents in University (NCET)
- SRF for ROCS, SEM
- Eiffel fellowship
- CSC scholarship
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The large electrically stimulated actuation in high-performance actuator materials requires a careful investigation of how the variation in strain would affect the mechanism of inside polarization and thus the final dielectric properties of the carbon nanotube electroactive composites. Herein, we systematically studied the tensile strain's effect on the dielectric properties of multiwall carbon nanotube (MWNT)/poly(vinylidene fluoride) (PVDF) nanocomposites, by quantitatively characterizing the inside microstructure shift during uniaxial mechanical stretching. The results showed that MWNTs became aligned in response to the external stretching and the preferential alignment degree increased with the tensile strain. This in turn triggered a complex changing law of macroscopic dielectric properties. Maximum increment in the dielectric permittivity of the composite can reach 30% at 10(2) Hz relative to that before stretching. Evolution of conductive pathways and formation of microcapacitors during stretching can be invoked as being responsible for the large variation of dielectric properties. This was finally confirmed by using an equivalent circuit model of two parallel RC circuits in series to analyze the impedance data.
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