Optical Properties and Luminescence Behaviour of PP/Clay Nanocomposites

Abstract

Silicate nanocomposites might be a great source of innovation for the development of advanced electrical devices since filler introduction improves mechanical properties, thermal stability and some electrical properties. In a first part of this paper we summarize results obtained by photoluminescence and UV-visible absorption spectroscopy. The optical balance (absorption vs. diffusion) is discussed and a detailed photoluminescence emission spectra analysis is provided. Grafting maleïc anhydride (MA) on PP chains induces the formation of a broad absorption band (250-450nm) and changes in the photoluminescence emission spectrum whereas clay introduction increases light diffusion. In a second part we discuss results obtained using different luminescence techniques (recombination-induced luminescence - RIL-, thermoluminescence and electroluminescence) in order to characterise charge recombination mechanisms and the nature of trapping centres in such materials.