A novel actuating single wall carbon nanotube (SWNT)/polymer composite is reported. It exhibits a large strain (2.6%) at a low driving voltage (<1 MV m−1) while possessing excellent mechanical and thermal properties. The strain energy density is at least an order of magnitude greater than any state‐of‐the‐art polymeric materials reported. The actuating characteristic mainly originates from the electrostrictive contribution, presumably due to interfacial polarization.

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