Makrocka-Rydzyk M, Glowinkowski S, Jurga S, Meyer W H
Institute of Physics, A. Mickiewicz University, Poznań, Poland.
Solid State Nucl Magn Reson. 1995 Aug;4(6):353-60. doi: 10.1016/0926-2040(95)00013-g.
Temperature dependences of proton and fluorine second moments and spin-lattice relaxation time T1 below glass transition were measured in glassy "I-Do,Pip-Me-BF4" ionene. The existence of motions of methyl groups and segments linking the cationic centers, namely piperidinium rings and trimethylene groups, for the polymeric part of ionene were established. Isotropic rotation of the counter-ion was evidenced and its limited diffusion suggested. To interpret the proton and fluorine relaxation data, a Davidson-Cole distribution of correlation times was assumed.
