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

  • Alicia M. Ortega (a1), Christopher Michael Yakacki (a2), Sean A. Dixon (a3), Alan R. Greenberg (a4) and Ken Gall (a5)...

Abstract

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 (Tg ). 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.

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

  • Alicia M. Ortega (a1), Christopher Michael Yakacki (a2), Sean A. Dixon (a3), Alan R. Greenberg (a4) and Ken Gall (a5)...

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