Temperature dependences of ~H n.m.r, spin-lattice relaxation times (7"1) were measured for poly(p-phenylene sulphide) (PPS) heavily doped with sulphur trioxide (SO3). A clearly non-exponential character of the magnetization recoveries was observed. The magnetization recovery is characterized by an exp[- (t/T1) ~/2] time dependence over a wide time interval and for the whole temperature range studied, indicating diffusionless relaxation of the nuclei to the paramagnetic centres. The temperature dependence of T~ is weakly thermally activated. The annealing of doped PPS at 450 K changes the mechanism of the relaxation. In this sample the relaxation is related to the thermally activated motion of protons from phenylene rings and sulphuryl groups
Посилання на статтю:
Nuclear magnetic relaxation studies of poly(p-phenylene sulphide) doped with sulphur trioxide / J. Jurga and P. Hruszka* // Polymer. – 1992. – Vol 33. – P. 498-501.