UV-VIS Spectroscopic Investigation of Magnesium/Fluorocarbon Pyrolants

摘要

A series of magnesium based pyrolants were prepared from both poly(tetrafluoroethylene), and poly(carbon monofluoride) as oxidizer and Macroplast®, Viton® and Hycar® as binder by conventional, shock-gel and extrusion process. The formulations had the general stoichiometry: Mg/C_nF_m/C_xH_yX_z, 57-60/30-35/5-10 with X = F, Cl or H. Strands of the pyrolant were ignited and the UV-VIS spectra were recorded. In addition color photographs were taken from the burning strands with a camcorder. Mg combustion in a fluorocarbon environment yields a series of distinct lines and bands in the 200 - 540 nm range which allow for identification of main combustion products and transient species such as magnesium monofluoride, MgF and e.g. difluorocarbene, CF_2. On basis of spectra a gas phase combustion mechanisms is discussed.