Electromechanically Durable Graphene Oxide-Embedded Elastomer via Simultaneous Corporation of Siloxane/Polyol Based on the Dual Secondary Bond Architecture AITranslate

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DOI：https://doi.org/10.1021/acsapm.1c01914

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Graphene, an electrically conductive reinforcement material, is investigated for its strain sensing capabilities in the form of a thermoplastic polyurethane–graphene oxide (TPU–GO) composite. The electromechanical properties of the graphene-based strain sensors at different loading concentrations of 3, 5, and 7 wt % GO were studied. The TPU–GO strain sensor with the 7 wt % GO loading concentration was found to endow the most sensitive and stable electromechanical performance. The TPU–GO strain sensor was better with the addition of polyethylene glycol (PEG) (TPU–GO–PEG), which behaves as a binder, and was further enhanced with the formation of a hybrid silica structure (SiO2) (TPU–GO–SiO2) in the polymer matrix. Its strain sensing performance was further examined in terms of stretch–release cycles at different strains, durabilities, and strain speeds. Notably, the TPU–GO–PEG–SiO2 strain sensor exhibited the highest gauge factor (GF = 9.14); significantly enhanced mechanical properties, thermal stability, and electrical response; and long-term durability (>20,000 cycles). This is attributed to the homogeneous dispersion of GO sheets and a strong interfacing interaction between the conductive filler and the TPU matrix aided by siloxane and polyether via hydrogen bonds.