Anisotropy of local relaxation properties of macromolecules. Polarized luminescence

Abstract

A tetrahedral lattice model for a polymer chain with three-unit kinetic elements was used to find the correlation functions which describe the local dynamics of unit vectors oriented in the longitudinal or transverse directions with respect to the chain. These unit vectors can represent the dynamics of the emitting oscillator of the marker. It is shown that the spectra for longitudinal and transverse components of the emitting oscillator differ greatly. It is also shown that at short relaxation times the anisotropy of local relaxation properties of a kinetic chain fragment may be described by an equivalent ellipsoid with an axes ratio of ca. 10.

NMR relaxation in semiflexible Vicsek fractals

“…Professor Gotlib, as a pioneer of the theoretical polymer physics, did an immense contribution to the development of the theory of orientanional mobility in various polymeric systems. Starting investigations in this field with polymer chains [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], he has also studied more complex systems like polymer networks [22][23][24][25][26][27] and dendritic macromolecules [28][29][30][31][32]. The significant part of these works has been devoted namely to the role of orientational mobility for the NMR relaxation [6, 7, 11-13, 15, 18-24, 31, 32].…”