Abstract
Thermally stimulated discharge current (TSDC) studies on thin films of styrene-methyl methacrylate copolymer in the ratio 45:55 are reported. Films of thickness 7.36 μm were grown by the isothermal immersion technique. Only one current maximum was observed in the TSDC spectrum for polarizing fields < 20 × 10 5 V/m and two current maxima were observed at higher fields for all polarizing temperatures. Relaxation times and activation energies were evaluated using existing theories. The low-temperature peak was attributed to dipolar orientation and the high-temperature peak to glass transition relaxation.
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