DOUBLE ELECTRON-ELECTRON RESONANCE IN ELECTRON-SPIN ECHO - CONFORMATIONS OF SPIN-LABELED POLY-4-VINILPYRIDINE IN GLASSY SOLUTIONS

Double electron-electron resonance in electron spin echo has been used to study the glassy solutions of poly-4-vinylpyridine doped by nitrox yl radicals frozen in liquid nitrogen. The phase relaxation of spin la bels due to spin-spin interaction of unpaired electrons has been studi ed. The intramolecular and intermolecular contributions of the dipole- dipole interaction of spin labels into relaxation process have been se parated. It has been established that both the intramolecular and inte rmolecular spin-spin interaction of spin labels lead to the dependence of echo signal on time T of the exp(-aT(q)) type. It is shown that fo r the intramolecular interaction the experimental q value is 0.3, for the intermolecular one it is 2. The assumption has been made of the li near structure of polymeric molecules due to the presence of a suffici ently high density of an electric charge on polymeric molecules.