wizyta

od 2020-09-20

Title: Molecular dynamics in stiff ionene below glass-transition

Source: Solid State Nuclear Magnetic Resonance

Year : 1995

Abstract:

Temperature dependences of proton and fluorine second moments and spin-lattice relaxation time T-1 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.

DOI: 10.1016/0926-2040(95)00013-G   (Pobrane:  aktualizowanie)