期刊
MATERIALS HORIZONS
卷 8, 期 10, 页码 2834-2841出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1mh01020d
关键词
-
资金
- National Natural Science Foundation of China [21636008, 21474090]
A facile thermomechanical training method is proposed to adaptively reconstruct the network of elastomers, enhancing their electro-actuation performance. The trained elastomers exhibit large stable electro-actuation strain and high energy density.
Soft biological tissues and muscles composed of semiflexible networks exhibit rapid strain-hardening behaviors to protect them from accidental rupture. In contrast, synthetic soft elastomers, usually featuring flexible networks, lack such behaviors, leading to a notorious issue when applying them to a promising artificial muscle technology (dielectric elastomer, DE), that is electromechanical instability (EMI) induced premature breakdown. We report that a facile thermomechanical training method can adaptively reconstruct the network of a soft triblock copolymer elastomer to transform its flexible network strands into semiflexible ones without extra chemical modifications and additives so that the electro-actuation performance is significantly enhanced by avoiding EMI. The free-standing actuators of trained elastomers exhibit a large stable electro-actuation strain and a high theoretical energy density (133%, 307 kJ m(-3) at 158.1 V mu m(-1)), and the capacity of actuating at low-temperature environments (-15 degrees C).
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