Abstract
A positron annihilation study of poly(2,6-dimethyl-1,4-phenylene oxide) under isochronal annealing treatment is carried out both in the undoped state and in the 0.2% iodine-doped state. All the measured lifetime spectra are resolved into 3 components. From these lifetime values and their resp. intensities, trapping rates of positrons in the ordered regions and of positronium in the disordered regions of the polymer matrix are calcd. following the kinetic equations of A. V. Goldanskii et al. (1987). The obsd. variation of trapping rates as well as orthopositronium lifetime and intensity as a function of annealing temp. reflect a glass-rubbery transition at 145° in this polymer both in undoped and doped states. [on SciFinder(R)]
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