DIELECTRIC AND PROTON RELAXATION IN SOLUT IONS AND GELS OF THERMOTROPIC LINEAR SEGMENTAL POLYESTERS

Dielectric and proton magnetic relaxation of thermotropic linear polye sters with fumaroyl benzoate fragments was studied in semidilute solut ions and in the gel state. Specific features of the chain dynamics wer e established and the influence of molecular aggregation on this dynam ics was studied as a function of the polymer concentration in solution . It was shown that cooperative motions of associated mesogenic fragme nts takes place along with the local motions of short fragments of mon omer units. The cooperative motion is characterized by large values of the relaxation time (10(-6) s) and the activation energy (100 kJ/mol) . All the relaxation processes observed in solutions proceed in the ge l state as well.