Internal stress storage in shape memory polymer nanocomposites

Gall, Ken; Dunn, Martin L.; Liu, Yiping; Stefanic, Goran; Balzar, Davor
July 2004
Applied Physics Letters;7/12/2004, Vol. 85 Issue 2, p290
Academic Journal
We examine the storage and release of internal stresses in shape memory polymers reinforced with a dispersion of nanometer-scale SiC particles. A quantitative Rietveld analysis of diffraction peaks was used to measure changes in the lattice parameter of the SiC particles after permanent deformation at 25 °C, and subsequent shape recovery induced by heating to 120 °C. Under 50% compression of the composite material, the nanoparticles store a finite compressive stress, which is almost completely released during heated strain recovery. The values of the stored internal stresses in the particles are compared to values based on micromechanic calculations.


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