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Programmable Skins based on Core-Shell Microsphere/Nanotube/Polymer Composites

Published online by Cambridge University Press:  02 September 2015

Balaji Panchapakesan ,
Cagdas Onal  and
James Loomis
Balaji Panchapakesan
Affiliation:
Small Systems Laboratory, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
Cagdas Onal
Affiliation:
Soft Robotics Laboratory, Department of Mechanical Engineering, Robotics Engineering Program, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
James Loomis
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA02139, USA.
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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.

Keywords

actuatorcompositenanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1800: Symposium NN – Adaptive Architecture and Programmable Matter―Next Generation Building Skins and Systems from Nano to Macro , 2015 , mrss15-2136299
Copyright
Copyright © Materials Research Society 2015 

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