Dynamic Heterogeneity of Amorphous Polymers below and above Tg (FUNDAMENTAL MATERIAL PROPERTIES-Polymer Materials Science)

摘要

Dynamic heterogeneity has been investigated for amorphous polymers in terms of non-Gaussian parameter A0, which is currently believed to be a key to reveal anomalous dynamics near the glass transition. This parameter A0 was evaluated in incoherent elastic neutron scattering measurements in a wide range of Q (length of scattering vector). Combining the neutron data with the positron annihilation lifetime spectroscopy (PALS) data the spatial scale of the heterogeneous domain or the so-called cooperatively rearranging region (CRR) has been determined.