Abstract
A gas sampling system has been developed for the analysis of the pyrolysis and the combustion products of polymer materials. Gases produced are collected in the cold trap of a glass tubing (4 mm ID) packed with porous polymer beads in 2 cm length. Porapak Q is the best suited as a packing material. Gas retention ability of the trap is measured at temperatures of liquid nitrogen and dry ice-acetone. CO, CO2, CH4, C2H2, C2H4, C2H6, HCl and NH3 pass through the trap at the dry ice-acetone temperature. At the liquid nitrogen temperature, however, these gases are retained in the trap completely for more than several minutes. H2S, HCN and organic gases with more than 3 carbon atoms are retained in the trap at the dry ice-acetone temperature. Thus serial combination of these traps enable to collect gases fractionally from the pyrolysis or the combustion. On heating the traps, the collected constituents are released almost quantitatively. Capability of this sampling system is demonstrated by analyzing combustion gas from polyethylene.
