A study of local mobility in poly(isobutylene) by the spin probe method

A detailed study has been made of the rotation of the spin probe 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (TANOL) in the regime of fast motion in poly(isobutylene) using the activation energy; a free volume model of the probe mobility in the condensed phase is described. Results of the applications of exact and approximate treatments of the generalized free volume model are compared. An analysis of the geometrical and energy parameter of α-mobility has shown that the motion of the probe in the elastic state of the amorphous phase is controlled by local conformational mobility of small segments of the macromolecules.