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  • 1
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    Composite-Based High Performance Electroactive Polymers For Remotely Controlled Mechanical Manipulations in NASA Applications (2003)
    In:  CASI
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    Publication Date: 2019-07-10
    Description: This program supported investigation of an all-polymer percolative composite which exhibits very high dielectric constant (less than 7,000). The experimental results show that the dielectric behavior of this new class of percolative composites follows the prediction of the percolation theory and the analysis of the conductive percolation phenomena. The very high dielectric constant of the all-polymer composites which are also very flexible and possess elastic modulus not very much different from that of the insulation polymer matrix makes it possible to induce a high electromechanical response under a much reduced electric field (a strain of 2.65% with an elastic energy density of 0.18 J/cu cm can be achieved under a field of 16 MV/m). Data analysis also suggests that in these composites, the non-uniform local field distribution as well as interface effects can significantly enhance the strain responses. Furthermore, the experimental data as well as the data analysis indicate that the conduction loss in these composites will not affect the strain hysteresis.
    Keywords: Composite Materials
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Piezoelectric Polymers Actuators for Precise Shape Control of Large Scale Space Antennas (2007)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Extremely large, lightweight, in-space deployable active and passive microwave antennas are demanded by future space missions. This paper investigates the development of PVDF based piezopolymer actuators for controlling the surface accuracy of a membrane reflector. Uniaxially stretched PVDF films were poled using an electrodeless method which yielded high quality poled piezofilms required for this application. To further improve the piezoperformance of piezopolymers, several PVDF based copolymers were examined. It was found that one of them exhibits nearly three times improvement in the in-plane piezoresponse compared with PVDF and P(VDF-TrFE) piezopolymers. Preliminary experimental results indicate that these flexible actuators are very promising in controlling precisely the shape of the space reflectors.
    Keywords: Communications and Radar
    Type: SPIE Smart Structures and Materials and Nondestruvtive Evaluation and Health Monitoring; Mar 18, 2007 - Mar 22, 2007; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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