Multiwall carbon nanotube (MWNT) with high aspect ratio was dispersed into polyvinylidene fluoride (PVDF) to fabricate the MWNT/PVDF nanocomposites. Change of dielectric constant with increasing the length of tensile strain (LTS) was observed in the MWNT/PVDF composites with different mass concentration of MWNT ( and ). The results showed that an abrupt increase in dielectric constant appeared when the LTS was 4 and in the composites with and , respectively. By employing the evolutions of conductive pathway and microcapacitance structure during the tensile strain process, the increased dielectric constant could be explained well.
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