Long-time behavior of the deuteron NMR Free Induction Decay of reptating polymer chains

The classical tube-reptation (TR) model is based on the assumption that in entangled polymer melts diffusion takes place inside the effective tubes having a conformation of ideal chains and being stable on the time scale of the terminal relaxation time . This assumption leads for high molecular mass

Recent advances in the study of high molecular mass polymer melts diffusion by proton NMR

In high molecular mass polymer melts due to the linear structure of macromolecules and their mutual uncrossability a region of anomalous diffusion cover a very broad space/time interval. It extends up to the terminal relaxation time of a macromolecule , where is the segmental relaxation time and is

Fatkullin N.F. NMR PROTON SPIN RELAXATION AND DYNAMICS OF POLYMER 10-15 ? 11-00, Monday, November 13

Proton spin-lattice and spin-spin relaxation are governed by magnetic dipole-dipole interactions between protons from the same and the different macromolecules. The spin-lattice relaxation rate in case when the Redfield limit is satisfied, ( is the resonance frequency, is the spin-lattice relaxat