Quasielastic Light Scattering from Dilute and Semidilute Polymer Solutions

摘要

The goal of this report is to demonstrate how photon correlation spectroscopy has enhanced understanding of the statistical properties of chain molecules in solution. Since polymer gels, polymer glasses and phase phenomena are treated elsewhere, these subjects are not considered. For simplicity the single chain problem is treated before adding the complicating effects of interchain interactions and entanglements. The dynamics of a single polymer chain are complex with many possible approaches to the problem. Therefore this subject is first treated in a simplified manner employing scaling ideas and later in more detail and rigor using the Zwanzig-Mori formalism. In both cases the renormalization or blob concept is introduced to interpret subtle aspects of the molecular weight dependence of the dynamics of a single chain. After the single chain problem, the virial regime is briefly reviewed. The discussion of the virial regime naturally leads to consideration of semidilute solutions. 96 references. (ERA citation 07:055374)