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

Publication ,  Conference
Ortega, AM; Yakacki, CM; Dixon, SA; Greenberg, AR; Gall, K
Published in: Materials Research Society Symposium Proceedings
January 1, 2009

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.

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Published In

Materials Research Society Symposium Proceedings

DOI

ISSN

0272-9172

Publication Date

January 1, 2009

Volume

1190

Start / End Page

13 / 18
 

Citation

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Ortega, A. M., Yakacki, C. M., Dixon, S. A., Greenberg, A. R., & Gall, K. (2009). Effect of chemical crosslinking on the free-strain recovery characteristics of amorphous shape-memory polymers. In Materials Research Society Symposium Proceedings (Vol. 1190, pp. 13–18). https://doi.org/10.1557/proc-1190-nn01-02
Ortega, A. M., C. M. Yakacki, S. A. Dixon, A. R. Greenberg, and K. Gall. “Effect of chemical crosslinking on the free-strain recovery characteristics of amorphous shape-memory polymers.” In Materials Research Society Symposium Proceedings, 1190:13–18, 2009. https://doi.org/10.1557/proc-1190-nn01-02.
Ortega AM, Yakacki CM, Dixon SA, Greenberg AR, Gall K. Effect of chemical crosslinking on the free-strain recovery characteristics of amorphous shape-memory polymers. In: Materials Research Society Symposium Proceedings. 2009. p. 13–8.
Ortega, A. M., et al. “Effect of chemical crosslinking on the free-strain recovery characteristics of amorphous shape-memory polymers.” Materials Research Society Symposium Proceedings, vol. 1190, 2009, pp. 13–18. Scopus, doi:10.1557/proc-1190-nn01-02.
Ortega AM, Yakacki CM, Dixon SA, Greenberg AR, Gall K. Effect of chemical crosslinking on the free-strain recovery characteristics of amorphous shape-memory polymers. Materials Research Society Symposium Proceedings. 2009. p. 13–18.

Published In

Materials Research Society Symposium Proceedings

DOI

ISSN

0272-9172

Publication Date

January 1, 2009

Volume

1190

Start / End Page

13 / 18