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Tailored Electrostriction in Self-Assembled Block Copolymers
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DOI：10.1021/acsapm.5c04067.png)
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Abstract
En 中文
Electrostrictive polymers are of practical interest for emerging applications, including capacitive sensors, microrobotics, and mechanical energy harvesting, due to their low hysteresis and high deformability. However, their practical deployment is limited by a low electromechanical coupling coefficient. Developing polymeric materials with tunable electrostriction has remained a long-standing challenge. Herein, we address this limitation by harnessing block copolymer self-assembly to produce nanostructured electrostrictive films. Tunable electrostrictive coefficients were achieved by manipulating dielectric heterogeneities through the segregation behavior of methacrylate-type block copolymers, which consist of a poly(ionic liquid) block linked to an insulating mechanically robust block. The resulting electrostrictive response was found to strongly depend on the self-assembled morphology and its ordering quality. Solvent-annealed films with ionic blocks segregated into isolated spherical domains within an insulating matrix exhibited slightly lower electrostrictive coefficients but significantly reduced dielectric losses compared to as-cast films. In contrast, well-ordered lamellar morphologies yielded electrostrictive coefficients up to an order of magnitude higher than those of as-cast films over the measured frequency range. These findings demonstrate that block copolymer self-assembly is a powerful approach to precisely control the nanoscale architecture of electrostrictive polymers, offering a versatile strategy to enhance and tailor their electromechanical performance.
Keywords:
block copolymer
self-assembly
nanostructuration
dielectric properties
interfacial polarization
electrostriction
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