Radiothermoluminescence Studies of Polymer Solids
Final rept. 1 Aug 1985-31 Jul 1988
NORTHWESTERN UNIV EVANSTON IL
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Radiothermoluminescence RTL involves irradiating a sol id at low temperature 77K with ionizing radiation and observing luminescence when heating the sample at a constant rate 10 Kmin. Glow peaks are observed at characteristic temperatures which, for polymers, are diagnostic of the onset of thermally activated molecular motions. A scanning electron microscope SEM was modified to irradiate polymer samples with medium energy 5-30 keV electrons. This SEM-RTL device is more convenient and reliable than other techniques which utilize remote radiation sources though information is confined to the near surface regions of the sample. In particular, the oxygen-free environment of the SEM-RTL experiment permitted observation of high temperature relaxations up to 150 C or 423 K for the first time in a number of thermoplastics. Keywords Polymer relaxation Molecular motion Electron irradiation Charge recombination Luminescence.
- Polymer Chemistry