15 April 2016 Use of the shape memory polymer polystyrene in the creation of thin film stretchable sensors for wearable applications
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Abstract
The shape memory polymer polystyrene (PS) has been used to create complex hierarchical wrinkling in the fabrication of stretchable thin film bimetallic sensors ideal for wearable based gesture monitoring applications. The film has been bonded to the elastomer polydimethylsiloxane (PDMS) and operates as a strain gauge under the general notion of geometric piezoresistivity. The film was subject to tensile, cyclic, and step loading conditions in order to characterize its dynamic behavior. To measure the joint angle of the metacarpophalangeal (MCP) joint on the right index finger, the sensor was adhered to a fitted golf glove above said joint and a motion study was conducted. At maximum joint angle the sensor experienced roughly 23.5% strain. From the study it was found that two simple curves, one while the finger was in flexion and the other while the finger was in extension, were able to predict the joint angle from measured voltage with an average error of 2.99 degrees.
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Kyle R. Van Volkinburg, Kyle R. Van Volkinburg, Thao Nguyen, Thao Nguyen, Jonathan D. Pegan, Jonathan D. Pegan, Michelle Khine, Michelle Khine, Gregory N. Washington, Gregory N. Washington, "Use of the shape memory polymer polystyrene in the creation of thin film stretchable sensors for wearable applications", Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 97990X (15 April 2016); doi: 10.1117/12.2218389; https://doi.org/10.1117/12.2218389
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