期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 195, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108202
关键词
Functional composites; Polymer-matrix composites (PMCs); Nano particles; Mechanical properties; Elastic modulus
资金
- National Natural Science Foundation of China [51873022]
- Support Project of High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [CITTCD201904046]
Herein, high-dielectric-constant titanium dioxide (TiO2) nanoparticles, modified by gamma-methacryloxypropyl trimethoxy silane (referred as mTiO(2)) and polar dioctyl phthalate (DOP), were introduced into natural rubber (NR) to obtain high-performance dielectric elastomer composites. The incorporation of DOP sharply decreased the elastic modulus of mTiO(2)/NR composites by decreasing the entanglement between NR chains and weakening the enforcement effect of mTiO(2) nanoparticles. At the same time, highly polar DOP improved the dielectric constant of mTiO(2)/NR composites and resulted in high electromechanical sensitivity (beta). Finally, a large actuated strain of 25.3% has been rendered by 50 phr DOP/mTiO(2)/NR composite at 40 kV/mm, which is similar to 10 times higher than pure NR (2.6%) under the same electric field. The present study reveals that the plasticizer-enhanced flexibility of inorganic dielectric filler/polymer composites is an effective method to enhance the electromechanical performance of dielectric elastomer actuators.
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