NMR free induction decay in crosslinked polydimethylsiloxane networks. Theoretical analysis

A theory of nuclear magnetic resonance free induction decay (FID) in crosslinked poly-dimethysiloxane networks is proposed. The anomalously small amplitude of the FID asymptotes at high temperatures is explained as due to crosslink motions. The Anderson-Weiss theory is generalized to account for the non-Gaussian distribution of local dipolar fields. © 1993 John Wiley & Sons, Inc.