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Abstract
Temperature dependences of 1H n.m.r. spin-lattice relaxation times ( T 1) were measured for poly( p-phenylene sulphide) (PPS) heavily doped with sulphur trioxide (SO 3). A clearly non-exponential character of the magnetization recoveries was observed. The magnetization recovery is characterized by an exp[−( t T 1 ) 1 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 1 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.
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