Abstract
In this paper, we describe unique thermally responsive polymer system based on nanotube-elastomers dispersed with core-shell expanding microspheres (phase-change material). Upon thermal or infrared stimuli, liquid hydrocarbon cores encapsulated within the microspheres vaporize, expanding the surrounding shells and stretching the matrix. Microsphere transformation resulted in visible dimensional changes associated with macroscopic volume increase (>500%), reduction in density (>80%), and increase in elastic modulus (>675%). Additionally, electrically conductive nanotubes allowed for expansion dependent electrical responses. We present our new findings on expansion dependent superhydrophobicity in these materials and present some outlook and comparison of our stimuli responsive polymers with other material systems for future origami based applications.
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Panchapakesan, B., Onal, C. & Loomis, J. Programmable Skins based on Core-Shell Microsphere/Nanotube/Polymer Composites. MRS Online Proceedings Library 1800, 10 (2015). https://doi.org/10.1557/opl.2015.781
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DOI: https://doi.org/10.1557/opl.2015.781