Enhanced dielectric, energy storage, and actuated performance of TPU/BaTiO3 dielectric elastomer composites by thermal treatment
writer：Rui Xue, Shifeng He, Yongqing He, Yan Huang, Yibo Wu, Qisong Shi*, Yongri Liang*
keywords：dielectric elastomer
source：期刊
specific source：Polymer Composites, 2022, 1–12
Issue time：2022年
In this paper, barium titanate nanoparticles (BaTiO3, BT) were incorporated
into the polyurethane (TPU) matrix to prepare dielectric elastomer composites.
Then, the composites were thermal treated to improve the interfacial compatibility between TPU and BT, enhance the interface polarization, and improve
the dielectric properties. The results showed that the dielectric constant of the
composites after thermal treatment at 150C reached to 7.3 at 1 kHz, the elongation at break remained 1934%, and the elastic modulus (Y) dropped to
4.4 MPa. In addition, the discharge energy density reached 73 mJ/cm3 under
an electric field of 300 kV/cm, and charge–discharge energy conversion efficiency was up to 84%. More importantly, the electrically actuated displacement
of 2.61 mm at electric field of 160 kV/cm was 1.7 times greater than that of
untreated composites. The composites worked stably under the action of the
circulating electric field. This study provided a new strategy for obtaining highperformance dielectric elastomer actuators, which were expected to be applied
to biomimetic robots, human skin, or dielectric energy storage devices.