THE TECHNOLOGY:

Scientists at NASA Langley Research Center have developed a novel electroactive SWCNT polymer composite that is an intrinsic unimorph. The system demonstrates electrostrictive actuation of a composite that is caused by increased interfacial polarization at the interfaces between the nanotubes and the matrix. The technology can function as an intrinsic unimorph actuator that does not require adhesive or extraneous inactive layers to generate large bending actuation. The CNT composite forms an intrinsic unimorph actuator during the film processing, which is significant because there is no need to induce bending strain in active layers or adhesive. This makes manufacturing the actuator easy and eliminates any future delamination problems. The unimorph can actuate strains (2.6%) at low driving voltages (<1 MVm-1) while maintaining its high performance in mechanical durability, thermal stability, and chemical resistance. The intrinsic unimorph actuator does not require adhesive or extraneous inactive layers to generate the bending actuation. The comparison of the electromechanical properties displayed in the table below conveys the significance of the NASA materials performanceNASA Langley Research Center Electroactive Polyimide (LaRC-EAP) CNT composites in a dry state without any electrolytes. The tunable multifunctionality and structural reinforcement achieved with the NASA composites could contribute to the design of intelligent and durable components for future aerospace vehicles as well as terrestrial applications.

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