Abstract
We have significantly improved a method to characterize the displacement fields near edge dislocations in ordered polymers. Our extended analysis now makes it possible to predict and explain the variation in tilt of different lattice planes in the vicinity of dislocations in isotropic solids, anisotropic crystals, and liquid crystals in terms of their elasticity constants. Direct images of the dislocation cores were obtained in three different polymer systems using bright field transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). A b[010] = 63 nm edge dislocation was imaged in the ABC triblock copolymer polystyrene-block-poly(ethylene-co-butylene)-block-poly(methyl methacrylate) (SEBM). The isotropic displacement fields according to theories by Taylor and Burgers were compared to the SEBM data. Fitting the theoretical displacement fields to the displacements measured from the image, an estimate of the elastic constant anisotropy was obtained. For this material the ratio o...
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