TSL Studies of Monovalent and Divalent Salts of Polystyrene Sulfonate

Abstract

Abstract

Thermally stimulated luminescence (TSL) spectra of monovalent and divalent salts of polystyrene sulfonate (PSS) have been recorded to study molecular relaxations and thermally induced processes. Monovalent salts [sodium polystyrene sulfonate (NaPSS) and potassium polystyrene sulfonate (KPSS)] have shown glow peak around 365 K and 369 K while divalent salts [calcium polystyrene sulfonate (CaPSS) and barium polystyrene sulfonate (BaPSS)] have exhibited two glow peaks around 345 K, 385 K (CaPSS) and 350 K, 393 K (BaPSS), respectively. The observed glow peaks are analyzed by initial-rise method and Chen’s method. Activation energies associated with the release of traps have been evaluated. Origin of first glow peaks is interpreted to be due to the traps created on decomposition of polymers during thermal stimulation. Reason for shifting of glow peak with the substitute monovalent/divalent anion is explained.

Keywords: monovalent, divalent, glow peaks, thermal stimulation