Analysis of mechanisms of rotational motion of polybutadiene macromolecules

Times of spin-lattice, spin-spin and effective relaxations in the MW-4 sequence averaging dipole interaction have been measured in the temperature range 170-320°K for eight polybutadiene specimens with MW in the range 103-106. An analysis of temperature and MW dependences of the measured relaxation parameters shows that motion of the polybutadiene main chain may be described with the aid of three correlation time spectra corresponding to two anisotropic mechanisms of rotational motion and one isotropic mechanism. © 1982