(774c) Bio-Inspired Design of Stimuli Responsive Materials Based on a Bilayer Structure
AIChE Annual Meeting
2017
2017 Annual Meeting
Materials Engineering and Sciences Division
Multifunctional Composites
Monday, October 30, 2017 - 1:00pm to 1:15pm
A bilayer structure composed of polyvinyl alcohol (PVA) or PVA composite thin film atop thick polydimethylsiloxane (PDMS) substrate was prepared. The bilayer structure shows dynamic strain-responsive optical properties. The transition between a transparent state to an opaque state can be easily achieved by uni-axially stretching and releasing the device. Also, a series of derivative mechanochromisms with capabilities of switch âon/offâ fluorescence, change fluorescent color, reveal/hide information upon mechanical stimuli are prepared. Mechanical or/and moisture responsive wrinkling surface can also be achieved in a similar manner. By altering the chemical structure of the PVA top layer, three different moisture responsive dynamic wrinkling surfaces can be prepared. Selectively inducing chemical modification on the PVA surface can create moisture responsive patterned wrinkles, which can lead to applications in encryption, anti-counterfeit tab, and water indicator for circuits.