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In this article, core-shell structured calcium copper tita-nate@polyaniline (CCTO@PANI) was synthesized using a simple procedure involving in situ polymerization of aniline in aqueous hydrochloric acid solution. Then, polydimethyl siloxane (PDMS) filled with self-prepared CCTO@PANI particles had high dielectric constant, low dielectric loss, and actuated strain which was greatly improved at low electric field. Meanwhile, the elastic modulus of CCTO@PANI/PDMS composites was increased slightly only with a good flexibility. Compared to pure silicone elastomer (8.94%), the CCTO/PDMS and CCTO@PANI/PDMS (The weight ratio of CCTO and aniline was 10) composites exhibited a greater actuated strain of 10.95% and 13.24% at a low electric field and filling content of 10 V/lm, respectively. This study provided a simple and effective method for the improvement of actuated strain at low electric field through addition of CCTO@PANI/PDMS composites due to the hyper-electronic polarization and a strong polaron delocalization, facilitating the wide application of dielectric materials. POLYM. COMPOS., 00:000-000, 2017.

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In this article, submicron and micron calcium copper titanate (CCTO) crystallites with different morphologies were successfully designed and prepared by directly thermal treatment method and molten salt method, respectively. Then, the silicone elastomer filled with self-prepared CCTO particles had high dieletric constant, low dielectric loss, and actuated strain which was greatly improved at low electric field. The dieletric constant at 50 Hz obviously increased from 2.15 for pure silicone elastomer to 4.37 and 4.18 for the submicron and micron CCTO/poly (dimethyl siloxane) (PDMS) composites. The dielectric loss of the composites retained at a low value (less than 0.06). Meanwhile, the elastic modulus of CCTO/PDMS composites was increased slightly only with a good flexibility. Compared to pure silicone elastomer (2.25%), the submicron and micron CCTO/PDMS composites with 2 wt % content exhibited a greater strain of 7.69% and 9.83% at a low electric field of 5 V/lm. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42613.