Systematic divergences in the orthopositronium (o-Ps) annihilation lifetimes, τ3, and
intensities, I
3, are observed, when comparing melt-crystallized and cold-crystallized poly(ethylene
terephthalate) (PET) as a function of crystallinity. Following a previous analysis of corresponding
deviations in oxygen permeability, the divergences in I
3 and τ3 are traced to distinct characteristic values
for the probability of o-Ps formation and o-Ps lifetime in the rigid amorphous phase (RAF) associated
with the crystalline lamellae and the mobile amorphous regions (MAF) which are unperturbed by the
presence of the crystal phase. Utilizing independent information on the volume fractions of RAF and
MAF, a quantitative analysis of the o-Ps annihilation parameters is possible.
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