VISUALIZATION OF IMMOBILIZATION IN SHEAR BANDS BY NMR IMAGING

Communication: A new H-1-NMR imaging method, in which the relaxation t ime provides the contrast, is demonstrated to be suitable for investig ating the effect of shear bands-strongly localized inhomogeneities of the plastic deformation-on the local mobility of polymeric materials i n the solid state. The immobilization of a shear band in cold-drawn po lycarbonate (PC) is visualized for the first time. In addition to a de scription of the experiment, results for PC are reported, showing, for example, that the phenylene motion is more affected by the strain tha t the methyl motion.