Abstract
Positron lifetime spectra of the semicrystalline polymer Polytetrafluoroethylene (PTFE) with high amorphous content are measured between — 190°C and 420°C and are decomposed into four annihilation terms. The four positron lifetimes and intensities reflect, apart from their density-caused temperature dependence, the structural changes of the polymer at the first and second order transitions. Above 100°C a secondary crystallization can be clearly observed.
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