Nuclear Magnetic Relaxation of Polymer Solutions. Side-Chain Motion

Abstract

In this paper, the magnetic relaxation of nuclei of spin ½ which are attached to polymer molecules is calculated. The computation is based on the idea that the relaxation process is a consequence of magneticdipole interaction between spins attached to the same segment. The particular point of this paper is to treat the relaxation as a consequence of the relative motion of the spins with respect to the polymer segment to which they are attached. The polymer segment, itself, undergoes a complicated Brownian motion which has been analyzed in a previous paper in terms of the Zimm—Rouse model of chain macromolecules.