Deformation limits in shape-memory polymers
The relationship between strain to failure, temperature, and polymer structure in incompatible shape-memory polymer networks was analyzed. The location of the deformability peak in the polymer networks is found to coincide with the onset of the glass transition measured by dynamic mechanical analysis. The polymer networks demonstrate a deformability peak near a particular temperature while the polymer materials show insignificant differences in their failure strains. The deformability peak location in temperature space does not shift as a function of increasing crosslinking density, as long as the glass transition temperature of the networks remain constant. The maximum strain value of the polymer networks achieved in the deformability peak is a function of crosslinking density.
Yakacki, CM; Willis, S; Luders, C; Gall, K
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