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Skeletal Muscle Fibers Inspired Polymeric Actuator by Assembly of Triblock Polymers
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Journal Article
Skeletal Muscle Fibers Inspired Polymeric Actuator by Assembly of Triblock Polymers
2022
Overview
Inspired by the striated structure of skeletal muscle fibers, a polymeric actuator by assembling two symmetric triblock copolymers, namely, polystyrene‐b‐poly(acrylic acid)‐b‐polystyrene (SAS) and polystyrene‐b‐poly(ethylene oxide)‐b‐polystyrene (SES) is developed. Owing to the microphase separation of the triblock copolymers and hydrogen‐bonding complexation of their middle segments, the SAS/SES assembly forms a lamellar structure with alternating vitrified S and hydrogen‐bonded A/E association layers. The SAS/SES strip can be actuated and operate in response to environmental pH. The contraction ratio and working density of the SAS/SES actuator are approximately 50% and 90 kJ m−3, respectively; these values are higher than those of skeletal muscle fibers. In addition, the SAS/SES actuator shows a “catch‐state”, that is, it can maintain force without energy consumption, which is a feature of mollusc muscle but not skeletal muscle. This study provides a biomimetic approach for the development of artificial polymeric actuators with outstanding performance. A actuator with striated structure like skeletal muscle sarcomeres is fabricated by assembly of two triblock copolymers, polystyrene‐b‐poly(acrylic acid)‐b‐polystyrene (SAS) and polystyrene‐b‐poly(ethylene oxide)‐b‐polystyrene (SES). The actuator presents the “catch‐state” that maintains force while without energy consumption, and has high contraction ratio and working density compared with human skeletal muscle.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
Subject
