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Thermo-mechanical Behavior of (Meth)Acrylate Shape-Memory Polymer Networks

Published online by Cambridge University Press:  26 July 2011

Carl P. Frick ,
Nishant Lakhera  and
Christopher M. Yakacki
Carl P. Frick
Affiliation:
Mechanical Engineering, University of Wyoming, Laramie, Wyoming, USA
Nishant Lakhera
Affiliation:
Mechanical Engineering, University of Wyoming, Laramie, Wyoming, USA
Christopher M. Yakacki
Affiliation:
MedShape Solutions, Inc., Atlanta, Georgia, USA School of Materials Science & Engineering, Georgia Institute of Technology, Atlanta, USA
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Abstract

Our overall approach is based on developing a photocrosslinkable polymer network with a favorable shape-memory response, using polymer chemistry and crosslinking density to control thermo-mechanical properties. Three polymer networks were created and thermo-mechanically tested, each from tert-Butyl acrylate linear builder co-polymerized with a poly(ethylene glycol) dimethacrylate cross-linker. By systematically altering the molecular weight and the weight fraction of the cross-linker, it was possible to create three polymers that exhibited the same glass transition temperature, but varied by almost an order of magnitude in rubbery modulus. Therefore, the mechanical stiffness could be tailored to suit a given application. Recovery behavior of the polymers was characterized over a range of deformation temperatures. It has been implicitly assumed a linear relationship between Free-Strain (i.e. no actuation force) and Fixed-Stress (i.e. maximum actuation force), however, this has never been confirmed experimentally. The energy per unit volume performed by the shape-memory polymer was quantified, and observed to be a function of strain recovered. The maximum recoverable work was shown to increase with cross-linking density, although the overall efficiency is similar for all materials tested.

Keywords

memorystress/strain relationshippolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1312: Symposium HH/II/JJ – Polymer-Based Materials and Composites—Synthesis, Assembly and Applications , 2011 , mrsf10-1312-hh07-02
Copyright
Copyright © Materials Research Society 2011

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