Effect of chemical crosslinking on the free-strain recovery characteristics of amorphous shape-memory polymers

Conference Paper

The goal of this study is to investigate the fundamental relationship between the extent of crosslinking and shape-memory behavior of amorphous, (meth)acrylate-based polymer networks. The polymer networks were produced by copolymerization of tert-butyl acrylate (tBA) and poly(ethylene glycol) dimethacrylates of differing molecular weights (PEGDMA). Polymer compositions were tailored via the amount (weight percent (wt%)) and molecular weight of the PEGDMA crosslinking agents added to produce four materials with varying levels of crosslinking (0, 2, 10, and 40 wt% crosslinking agent corresponding to 0, 0.6, 3.2, and 16.6 mole%) and nearly equal glass transition temperatures (T g). The effect of crosslinking on deformation limits and free-strain recovery is evaluated. Near complete strain recovery was demonstrated by all materials; however, absolute recovery strain decreased with increasing crosslinking due to a corresponding decrease in strain-to-failure. The results provide insights regarding the link between polymer structure, deformation limits, and strain-recovery capabilities of this class of shape-memory polymers. An improved understanding of this relationship is pivotal for optimizing system response for a wide range of shape-memory applications. © 2009 Materials Research Society.

Full Text

Duke Authors

Cited Authors

  • Ortega, AM; Yakacki, CM; Dixon, SA; Greenberg, AR; Gall, K

Published Date

  • January 1, 2009

Published In

Volume / Issue

  • 1190 /

Start / End Page

  • 13 - 18

International Standard Serial Number (ISSN)

  • 0272-9172

International Standard Book Number 13 (ISBN-13)

  • 9781605111636

Digital Object Identifier (DOI)

  • 10.1557/proc-1190-nn01-02

Citation Source

  • Scopus